General purpose filter

A portion of the disclosure of this Patent document contains material which is subject to copyright protection. The copyright owner has no objection to a facsimile reproduction, by any one, of the patent document or the patent disclosure, as it appears in the Patent and Trademark Office patent files or records, but otherwise reserves all copyrights with respect thereto.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to radar receivers. More specifically, the present invention relates to multi-purpose filters used in high performance digital radar receivers.

2. Description of the Related Art

Sophisticated high performance military and commercial digital radar receivers detect and process signals in complicated environments that include broadband clutter, interference sources (intentional and unintentional), echoes, and receiver noise. These receivers perform some or all of the following functions: synthesize in-phase (I) and quadrature (Q) components from high-speed sampled signals, form video filters, notch DC components, decimate data, provide channel-to-channel equalization, perform digital range correlation, and provide interference cancellation.

Currently, these tasks are performed by Hilbert filters, digital video filters, equalization filters, discrete Fourier transform, filters, decimating filters, convolvers, correlators, and general purpose cascadable FIR filters implemented in commercial off-the-shelf hardware (COTS) and customized hardware in embedded systems.

Unfortunately, digital radar receivers implemented in accordance with conventional teachings often require several hundred signal processing chips. As a result, conventional digital radar receivers are typically heavy, bulky, and expensive to develop and manufacture. In addition, these receivers typically consume considerable power and generate much heat.

Hence, there is a need in the art for a unique receiver architecture that is highly flexible, scalable, and reconfigurable that can perform the numerous functions mentioned above. Also, during real time embedded applications, the architecture should be continually reconfigurable to quickly, easily and inexpensively handle changing requirements.

SUMMARY OF THE INVENTION

The need in the art is addressed by the signal processor of the present invention. Generally, the inventive signal processor includes a plurality of filters which are selectively interconnected to provide a variety of digital signal processing functions. In the illustrative embodiment, each filter is adapted to multiply input data by a coefficient. Specifically, each filter includes circuitry to multiply input data by coefficients to form digital filtering products and adders to accumulators the sum of the products. The coefficients are provided by a microprocessor to configure the logic to a particular function, such as a general purpose filter, a Hilbert filter, a finite impulse response filter, an equalizer, a beamforming network, a convolver, a correlator, or an application specific integrated circuit by way of example. When interconnected in accordance with the teachings provided herein, these circuits may be used to provide a digital receiver.

That is, a digital receiver, constructed in accordance with the present teachings would comprise a plurality of general purpose filters constructed in accordance with the present teachings. Each filter would have a plurality of filter banks, switching circuitry to interconnect the filter banks, and programmability provided by an external processor. The processor configures the filter banks, to provide a delay element, a first decimating filter and a first equalizer in a first channel of a first general purpose filter and a Hilbert transform, a second decimating filter and a second equalizer in a second channel of the first general purpose filter. A first range correlator is provided in a first channel of a second general purpose filter and a second range correlator is provided in a second channel of a second general purpose filter. The first channel of the first general purpose filter is connected to the first channel of the second general purpose filter and the second channel of the first general purpose filter is connected to the second channel of the second general purpose filter.

An external processor programs the general purpose filter to configure the filter banks to simultaneously provide the functions found in most digital receivers (Hilbert transforms, video filters, equalizers, range correlation, and general purpose video filters).

The versatile, flexible and reusable features of the inventive general purpose filter architecture allows analog and digital receivers to be built using a single chip type. Accordingly, the receivers are much smaller and lighter in weight than conventional systems and have lower associated power dissipation, thermal heating, and development and manufacturing cost.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1

is a block diagram of the general purpose filter of the present invention along with associated control circuitry.

FIG. 2

is a schematic diagram of a portion of the general purpose filter of FIG.

1

.

FIG. 3

is a block diagram of the FIR filter utilized in the general purpose filter of the present invention.

FIG. 4

is a block diagram of an FIR sub-module utilized in the general purpose filter of the present invention.

FIG. 5

is a block diagram of an individual FIR filter cell utilized in the general purpose filter of the present invention.

FIG. 6

is an illustrative functional timing for a microprocessor read operation from the general purpose filter of the present invention.

FIG. 7

is an illustrative functional timing for a microprocessor write operation to the general purpose filter of the present invention.

FIG. 8

is an illustrative functional timing diagram for the Hilbert Transform Mode of the general purpose filter of the present invention.

DESCRIPTION OF THE INVENTION

Illustrative embodiments and exemplary applications will now be described with reference to the accompanying drawings to disclose the advantageous teachings of the present invention.

While the present invention is described herein with reference to illustrative embodiments for particular applications, it should be understood that the invention is not limited thereto. Those having ordinary skill in the art and access to the teachings provided herein will recognize additional modifications, applications, and embodiments within the scope thereof and additional fields in which the present invention would be of significant utility.

FIG. 1

is a block diagram of the general purpose filter of the present invention along with associated control circuitry. The system

10

consists of the general purpose filter

20

, a microprocessor

50

, a user interface

60

, a coefficient memory

70

, an interface and control circuit

80

, and a data collection memory

90

. The filter

20

includes first, second and third combiners

22

,

32

and

42

which allow the microprocessor

50

to selectively interconnect a plurality of 16 tap finite impulse response (FIR) filters

24

-

30

and

34

-

40

(even numbers only) therebetween via a bus (not shown). Tap filters

24

-

30

provide a first filter bank A between the first and second combiners

22

and

32

, respectively. Tap filters

34

-

42

provide a second filter bank B between the second and third combiners

32

and

42

, respectively. Note that the outputs of the first three filters in each bank are fed back to the inputs thereof. Those skilled in the art will recognize that the teachings of the present invention are not limited to FIR filter implementations. The present teachings may be implemented with infinite impulse response (IIR) filters as well.

A user selects a function to be implemented via a user interface

60

. As discussed more fully below and in accordance with the present teachings, in response to the user input, the microprocessor

50

selectively interconnects the tap filters via the combiners as necessary to implement the desired function. Much of the signal processing required to implement digital radar receivers can be implemented with a plurality of digital filters properly weighted. Accordingly, in the present invention, the filters are interconnected and provided with tap weight coefficients by the microprocessor as necessary for the desired functionality. The coefficients are provided by a coefficient memory

70

. In the illustrative embodiment, timing and control is provided by an interface and control circuit

80

.

FIG. 2

is a schematic diagram of a portion of the general purpose filter of FIG.

1

. In the illustrative embodiment, the system

10

is implemented as a general purpose digital filter (GPF) chip with 128 multiply-add filter cells fabricated in 0.35 micron CMOS technology. Using current technology and the present teachings, the chip

10

may be designed by one of ordinary skill in the art, to operate at rates up to 60 MHz with an asynchronous master reset. In the preferred embodiment, the chip

10

has two 16 bit input channels, two 32 bit output channels, a chip enable and a microprocessor interface.

In the illustrative embodiment, two input ports I and Q allow 128 filter cells to be shared between two data paths. This allows the input data to processed as two separate pieces of data or as complex data. Each path may be configured as a 16 tap arbitrary phase filter, a 32 tap filter or a 128 tap single channel filter. As discussed below, coefficient double buffering and clock synchronization logic permits the user to switch between coefficient sets without causing any undesirable effects in the filter's operation.

A microprocessor compatible bus

52

, (consisting of a 16 input address bus, a 16 bit bi-directional data bus, a read/write bit, and a control select), is connected to each element in the system

10

and provides read/write access to programmable internal registers therein. As discussed below, these internal registers are double buffered (see

FIG. 5

) to allow the chip to switch to new settings upon receipt of an external sync pulse. Consequently, a one clock update cycle is required to update the new settings.

The system

10

is partitioned into 8 functional blocks: a Random Number Generator (RNG)

44

, a Data Selector & Interface (DSI)

46

, a Saturation & Peak Detector (SPD)

48

, a DC Offset Compensation (DOC)

49

, a Finite Impulse Response filter (FIR)

50

, a Data Decimator & Interface (DCI)

52

, a Timing & Control Interface (TCI)

80

, and a Data Capture Memory (DCM)

90

. Each of these elements is of conventional design.

Banks of registers

54

and

56

are disposed along the data path in order to insure proper alignment of input data, sum data and data enable signals. In addition, the General Purpose Filter Chips may be “chained” together to create a larger multi-tap FIR without requiring additional external buffering.

The RNG

44

is a programmable pseudo-random number generator that allows for a known sequence of numbers to be inserted into the front-end of the data path for self-test purposes. The data sequence for each of the channels is based on the mode and seed values programmed into the number generator. The RNG

44

allows for 12, 14 or 16 bit operation and the data output can either be a constant value, a pseudo random pattern, DCM data or input data.

The DSI

46

is a programmable module that provides data selection and decimation. It provides odd/even data samples and has independent decimation rates for the data path channels and the DCM

90

.

The SPD

48

is a general purpose, dual channel, programmable saturation and peak detector. Separate saturation counters, saturation flags, threshold values and peak value data registers are provided for each channel. A saturation occurs when the absolute value of valid channel data is greater than that channel's programmed threshold value. The peak data, over the specified sample period, is determined by identifying the maximum squared value of non-saturated channel data. When a channel's peak value is identified, data for both channels is stored in memory.

The DOC

49

allows for a DC offset value to be calculated over a specified number of samples and then, if enabled, have the offset term removed from the input data stream. In the illustrative embodiment, valid data sample sizes for DC offset calculations are powers of 2, ranging from 2 to 256.

FIG. 3

is a block diagram of the FIR filter

50

. As illustrated in

FIG. 3

, the FIR

50

includes the following 3 sub-modules: FIRA

100

, DCF

200

, and FIRB

300

. FIRA and FIRB are identical FIR sub-modules. It is important to note that data from the I/O is pipelined prior to the FIRB block. This is necessary to maintain data alignment along the data path.

FIG. 4

is a block diagram of an FIR sub-module

100

. Each FIR sub-module

100

is a programmable transposed canonical FIR filter. The sub-module can be configured as a two channel, 16 tap delay Hilbert Transform filter followed by a 16 tap filter, a 32 tap FIR filter, a 64 tap single channel FIR filter, or a 2 channel, 16 tap cross coupled FIR filter. There is a rounding option between the two filters. The type of FIR filter (i.e. low pass, band pass, high pass) is determined by the coefficient values. The programmable coefficients are double buffered to allow the user to switch between coefficients without affecting the filter's operation.

FIG. 5

is a block diagram of an individual 16 tap FIR filter cell

24

. It should be noted that

FIG. 5

shows only 2 of the filter's 16 taps. The first tap

140

includes a multiplexer

142

having an output connected to the input of a buffer register

144

. The input to the multiplexer is a coefficient supplied by the microprocessor

50

of FIG.

1

. The. output of a buffer register

144

is connected to an operational register

148

. As mentioned above, the double buffering arrangement allows the chip to switch to new settings upon receipt of an external sync pulse. Consequently, a single clock update cycle is required to update the new settings. The output of the operational register

148

is supplied to a multiplier

152

which provides a product of the coefficient input to the buffer register

144

and input data to a summer

154

where it is added to any accumulated sum from previous taps and/or filters. The output of the summer

154

is input to a third register

158

from which it is selectively supplied to a second summer

160

under control of the timing circuit

80

. The second summer adds the sum of the product provided by the second tap

150

. The second tap

150

is identical to the first tap

140

. The output of the second summer

160

is stored in the third register

174

for output.

Returning to

FIG. 3

, the DCF is a decimator and control for finite impulse response filters. In addition to allowing for data decimation to occur between FIRA and FIRB, the DCF provides decimated FIRA data to the DCM. The decimation rate is programmable and allows for separate rates to be specified for FIRB and the DCM.

Returning to

FIG. 2

, the DCI

52

is a programmable, dual channel, data decimator that serves as an interface for the FIR

50

to the DCM

90

and external I/O. In non-bypass mode, the input data can be decimated, and presented to the output channel. The decimation rate for data out is independent of the decimation rate for RAM data. In the bypass mode, the data is not decimated and appears at the outputs unmodified. In this mode, the lower 16 bits are set to zero. There is a rounding option available at the data output stage.

The DCM

90

is a programmable memory module that allows input or output data from both channels to be captured. There are three points along the data path where data can be captured. The DSI

46

, DCF

200

and DCI

52

all provide the DCM

90

with data. In the illustrative embodiment, the DCM's memory is configured as two 512×16 RAMs and has a maximum input data rate of 30 MHz. These samples can be read by the microprocessor

50

(FIG.

1

). Data can be externally or internally triggered with or without a delay from the trigger to the time data is captured.

The TCI

80

handles the general timing, control, and interface requirements for the GPF. The 4 major functions of the TCI are: a microprocessor interface, data path control, AGC timing control and equalization timing control. In addition to each module's enable and data strobe signals, the TCI allows information to be sent over the microprocessor compatible bus. The bus has a 16 bit data I/O port, a 16 bit address port, a read/write bit, and a control select strobe. The control registers, coefficient registers, and DCM RAM are memory mapped into the 16 bit address space.

On chip diagnostic circuits are provided to simplify system debug and maintenance. The GPF has IEEE 1149.1 compliant boundary scan for board level test, scan for internal fault isolation, and Built-In Self Test (BIST) for internal memory verification. The boundary scan interface allows shifting of test data to and from the chips on a board for testing the integrity of the I/O. Scan circuitry provides access and visibility to internal registers, allowing for easy testing of combinatorial logic and checking register integrity. BIST verifies internal memory by writing and reading various patterns.

Signal Descriptions and Memory Map:

In the illustrative embodiment, the address bus is 16 bits wide and is partitioned as follows: the 4 MSBs make up the base address which identifies a particular GPF functional block, 1 bit is for growth and the 10 LSBs are for local addressing. An illustrative description of the input and output signals is shown in Table 1. (Note: The signal description provided in Table 1 is copyrighted by the present assignee and provided for the purpose of illustration only. A copying or creation of a derivative work from the signal description in Table 1 without the prior express written permission of the present assignee is expressly prohibited under U.S. and International Copyright Laws.)

An illustrative memory map is shown in Table 2. (Note: The memory map provided in Table 2 is copyrighted by the present assignee and provided for the purpose of illustration only. A copying or creation of a derivative work from the memory map in Table 2 without the prior express written permission of the present assignee is expressly prohibited under U.S. and International Copyright Laws.)

Functional Timing:

Illustrative functional timing for a microprocessor read operation from the GPF is shown in FIG.

6

. The enable signal ceIn indicates the beginning of a processor read/write cycle. After the address bus addressln and wrLowlIn are decoded, data from the memory location is put onto the data bus dataBi during the period when ceIn is active.

Illustrative functional timing for a microprocessor write operation to the GPF is shown in FIG.

7

. The enable signal ceIn indicates the beginning of a processor read/write cycle. After the address bus addressIn and wrLowIn are decoded, the location is written to on the rising edge of clockIn during the period when dsIn is active.

Illustrative functional timing for the Hilbert Transform Mode is shown in FIG.

8

.

Thus, the present invention has been described herein with reference to a particular embodiment for a particular application. Those having ordinary skill in the art and access to the present teachings will recognize additional modifications applications and embodiments within the scope thereof.

It is therefore intended by the appended claims to cover any and all such applications, modifications and embodiments within the scope of the present invention.

TABLE 1

Signal I/O Description

PIN NAME

SIZE

TYPE

FUNCTION

ch1SumIn(31:0)

32

Input

Input sum for channel 1

ch2SumIn(31:0)

32

Input

Input sum for channel 2

ch1DataIn(15:0)

16

Input

Input data for channel 1

ch2DataIn(15:0)

16

Input

Input data tor channel 2

dataEnLowIn

1

Input

ch1, ch2 data input rate strobe

(from DOC)

ExtDataEnLowIn

1

Input

ch1, ch2 data input rate strobe

(from I/O)

outputEnLowIn

1

Input

Chip output enable

dmaEnLowIn

1

Input

Enables the Data Capture

RAM Memory

cpiLowIn

1

Input

Coherent processing interval

input

pdiLowIn

1

Input

Pulse detection interval

ceLowIn

1

Input

Chip Enable

spdEnLowIn

1

Input

Disable Saturation &

Peak Detection

spdDumpLowIn

1

Input

Dump data from Saturation &

Peak Detection

dcCompEnLowIn

1

Input

Enable dc compensation

dcCalcEnLowIn

1

Input

Enable dc offset calculation

gblAddressIn

16

Input

Global address from external

processor

gblwrLowIn

1

Input

Global bus read/write strobe

gbloeLowIn

1

Input

Global bus output enable

gblDsLowIn

1

Input

Global data strobe

gblCeLowIn

1

Input

Global chip select strobe

resetLowIn

1

Input

Power up reset for asic

clockIn

1

Input

60 MHz clock

testEnIn

1

Input

Test - LSI Logic required

for setting bi-directionals

to inputs and tri-states off

tdiIn

1

Input

Test - boundary scan data input

tmsIn

1

Input

Test - boundary scan mode

select

tckIn

1

Input

Test - boundary scan clock

trstIn

1

Input

Test - boundary scan

asynchronous reset

bistModeIn

2

Input

Test - enable the memory BIST

scanEnIn

1

Input

Test - scan mode enable for test

scan1In

1

Input

Test - scan input #1

scan2In

1

Input

Test - scan input #2

scan3In

1

Input

Test - scan input #3

scan4In

1

Input

Test - scan input #4

procMonEnIn

1

Input

Test - Enable the parametric

nand tree

ch1SatLowOut

1

Output

Output indicates saturation

ch2SatLowOut

1

Output

Output indicates saturation

spdDumpOut

16

Output

Saturation & peak detection

module data dump

spdDumpEnLowOut

1

Output

Saturation & peak detection

module data dump enable

spdDumpDoneLowOut

1

Output

Saturation & Peak detection

module data dump done

ch1DataOut(31:0)

32

Output

Output sum data tor channel 1

ch2DataOut(31:0)

32

Output

Output sum data for channel 2

dataEnLowOut

1

Output

Ch1 & ch2 output data

valid

dataEnLowDlyOut

1

Output

Ch1 & ch2 output data

valid (program delay)

dmaDataOut

16

Output

Output capture of data

dmaDavLowOut

1

Output

Indicates each dma data sample

valid

dmaRdyLowOut

1

Output

Indicates dma capture memory

full and ready to clock data out

dmaDoneLowOut

1

Output

Indicates capture of data

complete

calcDoneLowOut

1

Output

Indicates DOC calculation

complete

gblRdyLowOut

1

Output

Indicates end of read/write cycle

tdoOut

1

Output

Test - boundary scan output

scan1Out

1

Output

Test - scan output #1

scan2Out

1

Output

Test - scan output #2

scan3Out

1

Output

Test - scan output #3

scan4Out

1

Output

Test - scan output #4

bistDoneOut

1

Output

Test - BIST output done

when high

bistErrorOut

1

Output

Test - BIST error occurs

when low

procMonOut

1

Output

Test - parametric nand tree

output

tstDcmFsmOut

5

Output

Test - DCM state machine

tstDocCalcStateOut

2

Output

Test - DOC DC offset

compensation state machine

gblDataBi

16

Bidirect

16 bit bi-directional global

data bus to external processor

TABLE 2

Memory Map

15-12 bits

11 bits

10-0 bits

Base Address

Growth

Address Field

Data

Base

Offset

Size

Initial

Addr

Addr

Item

Module

Access

(bits)

Value

Description

0000h

0h

LFSR modeB

RNG

R/W

2

0h

Determines LFSR & RNG mode (Buffered)

0h => Tactical

1h => Data from DCM

2h => LFSR enabled to count

3h => LFSR outputs constant value (seed)

1h

Seed 1B

RNG

R/W

16

0h

Channel 1 LFSR seed (Buffered)

2h

Seed 2B

RNG

R/W

16

0h

Channel 2 LFSR seed (Buffered)

3h

Data WidthB

RNG

R/W

2

2h

Input Dta Width (Buffered)

0h => 12 bit input data

1h => 14 bit input data

2h => 16 bit input data

3h => 12 but input data

4h

LFSR mode

RNG

R

2

0h

Determines LFSR & RNG mode

0h => Tactical

1h => Data from DCM

2h => LFSR enabled to count

3h => LFSR outputs constant value (seed)

5h

Seed 1

RNG

R

16

0h

Channel 1 LFSR seed

6h

Seed 2

RNG

R

16

0h

Channel 2 LFSR seed

7h

Data Width

RNG

R

2

2h

Input Data Width

0h => 12 bit input data

1h => 14 bit input data

2h => 16 bit input data

3h => 12 bit input data

1000h

0h

Data Dec Rate Buf

DSI

R/W

12

1h

Data path decimation rate out DSI block (Buffered)

1h

RAM Dec Rate Buf

DSI

R/W

12

1h

DCM data decimation rate out or DSI block (Buffered)

2h

Transform Select Buf

DSI

R/W

1

0h

Data select, Odd/Even or true 2 channel data

(Buffered)

0h => Samples from Channels 1 & 2

1h => Odd/even samples from Channel 1

3h

Data Dec Rate

DSI

R

12

1h

Data path decimation rate out ot DSI block

4h

RAM Dec Rate

DSI

R

12

1h

DCM data decimation rate out ot DSI block

5h

Transform Select

DSI

R

1

0h

Data select. Odd/Even or true 2 channel data

0h => Samples from Channels 1 & 2

1h => Odd/even samples from Channel 1

2000h

0h

ThresholdB

SPD

R/W

16

7FFFh

Buffered Threshold Value

1h

Sat1CountB

SPD

R

16

0h

Buffered Number of Channel 1 Saturated Samples

2h

Sat2CountB

SPD

R

16

0h

Buffered Number of Channel 2 Saturated Samples

3h

Pk1Ch1ValB

SPD

R

16

0h

Buffered Channel 1 Peak Value

4h

Pk1Ch2ValB

SPD

R

16

0h

Buffered Channel 2 Associated Value

5h

Pk2Ch1ValB

SPD

R

16

0h

Buffered Channel 1 Associated Value

6h

Pk2Ch2VaBt

SPD

R

16

0h

Buffered Channel 2 Peak Value

7h

Sat1Count

SPD

R/W

16

0h

Number of Channel 1 Saturated Samples

8h

Sat2Count

SPD

R/W

16

0h

Number of Channel 2 Saturated Samples

9h

Pk1Ch1Val

SPD

R/W

16

0h

Channel 1 Peak Value

Ah

Pk1Ch2Val

SPD

R/W

16

0h

Channel 2 Associated Value

Bh

Pk2Ch1Val

SPD

R/W

16

0h

Channel 1 Associated Value

Ch

Pk2Ch2Val

SPD

R/W

16

0h

Channel 2 Peak Value

Dh

Threshold

SPD

R/W

16

7FFFh

Threshold Value

3000h

0h

Sample Size Buffered

DOC

R/W

9

2h

Buffered DC compensation sample size

1h

Sample Size

DOC

R

9

2h

DC compensation sample size

2h

Ch1 Comp

DOC

R

16

0h

Channel 1 DC compensation value

3h

Ch2 Comp

DOC

R

16

0h

Channel 2 DC compensation value

Bit 13 = sumEnSig: Enables CH1 & Ch2 sum input

data.

0h => Disables

1h => Enables

Bit 14 = dataEnSelSig;

0h => Mux selects extDataEnLowIn

1h => Mux selects dataEnLowIn

Bit 15 = allTapMuxEnSig; Allows sum output from

FIR2 to be used as sum input to FIR3 and combiner

outputs sum data from FIR4 for Ch1 and zeros

for Ch2.

0h => Disables

1h => Enabled

80h

Buf. FIRA Mode Reg 2

FIRA

R/W

1

0h

Buffered FIRA Control Register 2

Bit 15 = Synchronous FIR clear

0h => Clear disabled

1h => Clear enabled

4000h

100-

Coefficients Mod 0

FRA

R

16

0h

Module 0 Tap 0-7 coefficients

107h

108-

Coefficients Mod 1

FRA

R

16

0h

Module 1 Tap 0-7 coefficients

10Fh

110-

Coefficients Mod 2

FRA

R

16

0h

Module 2 Tap 0-7 coefficients

117h

118-

Coefficients Mod 3

FRA

R

16

0h

Module 3 Tap 0-7 coefficients

11Fh

120-

Coefficients Mod 4

FRA

R

16

0h

Module 4 Tap 0-7 coefficients

127h

128-

Coefficients Mod 5

FRA

R

16

0h

Module 5 Tap 0-7 coefficients

12Fh

130-

Coefficients Mod 6

FRA

R

16

0h

Module 6 Tap 0-7 coefficients

137h

138-

Coefficients Mod 7

FRA

R

16

0h

Module 7 Tap 0-7 coefficients

13Fh

140h

Mode Register 1

FRA

R

16

0h

Mode 1 Control register

Data Bit 0; Read ch1DataMuxEnRSig

Data Bit 1; Read ch1ABDataMuxEnRSig

Data Bit 2; Read ch2DataMuxEnRSig

Data Bit 3; Read ch2ABDataMuxEnRSig

Data Bit 4; Read ch1MultEnRSig

Data Bit 5; Read ch2MultEnRSig

Data Bit 6; Read ch1RndEnRSig

Data Bit 7; Read ch2RndEnRSig

Data Bit 8; Read ch1MuxEnRSig

Data Bit 9; Read ch2SumMux2EnRSig

Data Bit 10; Read ch2MuxEnRSig

4000h

00-07h

Buf Coefficients Mod 1

FIRA

R/W

16

0h

Buffered Module 0 Tap 0-7 coefficients

08-0Fh

Buf Coefficients Mod 1

FIRA

R/W

16

0h

Buffered Module 1 Tap 0-7 coefficients

10-17h

Buf Coefficients Mod 2

FIRA

R/W

16

0h

Buffered Module 2 Tap 0-7 coefficients

18-1Fh

Buf Coefficients Mod 3

FIRA

R/W

16

0h

Buffered Module 3 Tap 0-7 coefficients

20-27h

Buf Coefficients Mod 4

FIRA

R/W

16

0h

Buffered Module 4 Tap 0-7 coefficients

28-2Fh

Buf Coefficients Mod 5

FIRA

R/W

16

0h

Buffered Module 5 Tap 0-7 coefficients

30-37h

Buf Coefficients Mod 6

FIRA

R/W

16

0h

Buffered Module 6 Tap 0-7 coefficients

38-3Fh

Buf Coefficients Mod 7

FIRA

R/W

16

0h

Buffered Module 7 Tap 0-7 coefficients

40h

Buf FIRA Mode Reg 1

FIRA

R/W

16

0h

Buffered FIRA Control Register 1

Bits 1-0 = ch1DataMuxEnSig,

ch1 ABDataMuxEnSig

0h => Mux selects ch1CascadeDataIn

1h => Mux selects ch1ABCascadeDatIn

2h => Mux selects ch1DataIn

3h => Mux selects zero

Bits 3-2 = ch2DataMuxEnSig

ch2ABDataMuxEnSig

0h => Mux selects ch2CascadeDataIn

1h => Mux selects ch2ABCascadeDataIn

2h => Mux selects ch2DataIn

3h => Mux selects zero

Bit 4 = ch1MultEnSig; Enables Ch1 phase shifting.

0h => Disabled

1h => Enabled

Bit 5 = ch2MultEnSig; Enables Ch2 phase shifting.

0h => Disabled

1h => Enabled

Bit 6 = ch1RndEnSig; Enables Ch1 rounding.

0h => Disabled

1h => Enabled

Bit 7 = ch2RndEnSig; Enables Ch2 rounding.

0h => Disabled

1h => Enabled

Bit 8 = ch1DataMux2EnSig

0h => Mux selects data from Ch1 Rnd/Mult

1h => Mux selects data from Ch1 data mux 1

Bit 9 = ch1 SumMux2EnSig

0h => Mux selects data from FIR1 sumOut

1h => Mux selects data from sumMuxEnSig

Bit 10 = ch2DataMux2EnSig

0h => Mux selects data from Ch2 Rnd/Mult

1h => Mux selects data from Ch2 data mux 1

Bit 11 = ch2SumMux2EnSig

0h => Mux selects data from FIR3 sumOut

1h => Mux selects data from FIR3 sumIn

Bit 12 = crossCoupleSelSig: Enables cross

coupling of data out of 16 tap FIRs.

0h => Disabled

1h => Enabled

Data Bit 11; Read ch2SumMux2EnRSig

Data Bit 12; Read crossCoupledEnRSig

Data Bit 13; Read sumEnRSig

Data Bit 14; Read dataEnSelRSig

Data Bit 15; Read allTapMuxEnRSig

Data Bit 15; allTapMuxEnRSig

180h

Mode Register 2

FRA

R

16

0h

Mode 2 Control register

Data Bit 0-14; No function

Data Bit 15 = Read firClr

5000h

0h

Data Dec Rate Buf

DCI

R/W

12

1h

buffered decimation rate for the output data

1h

RAM Dec Rate Buf

DCI

R/W

12

1h

buffered decimation rate for the RAM data

2h

Bypass Mode Buf

DCI

R/W

1

0h

buffered mode select

0h = non-bypass; Data passed through unchanged

1h = bypass; Bypass data (16) is passed directly

and concatenated with zeros based on the

scale format selected.

3h

Output Data Format

DCI

R/W

1

0h

buffered data format select

Buf

data not rounded = 0h

data rounded to 16 bits = 1h

4h

RAM Data Format Buf

DCI

R/W

1

0h

buffered RAM data format select

data not rounded = 0h

data rounded to 16 bits = 1h

5h

Scale Format Buf

DCI

R/W

3

0h

buffered scale format for output data

ouptut is input (round 16) data Bit 31, Bit 30:16 = 0h

ouptut is input (round 16) data Bit 31, Bit 29:15 = 1h

ouptut is input (round 16) data Bit 31, Bit 28:14 = 2h

ouptut is input (round 16) data Bit 31, Bit 27:13 = 3h

ouptut is input (round 16) data Bit 31, Bit 26:12 = 4h

ouptut is input (round 16) data Bit 31, Bit 25:11 = 5h

ouptut is input (round 16) data Bit 31, Bit 24:10 = 6h

ouptut is input (round 16) data Bit 31, Bit 23:9 = 7h

5000h

6h

RAM Scale Format Buf

DCI

R/W

3

0h

buffered scale format for RAM data

ouptut is input (round 16) data Bit 31, Bit 30:16 = 0h

ouptut is input (round 16) data Bit 31, Bit 29:15 = 1h

ouptut is input (round 16) data Bit 31, Bit 28:14 = 2h

ouptut is input (round 16) data Bit 31, Bit 27:13 = 3h

ouptut is input (round 16) data Bit 31, Bit 26:12 = 4h

ouptut is input (round 16) data Bit 31, Bit 25:11 = 5h

ouptut is input (round 16) data Bit 31, Bit 24:10 = 6h

ouptut is input (round 16) data Bit 31, Bit 23:9 = 7h

7h

Data Enable Delayed

DCI

R/W

4

1h

buffered data enable delayed

0 clock cycle delay from output data enable = 0h

1 clock cycle delay from output data enable = 1h

2 clock cycle delay from output data enable = 2h

3 clock cycle delay from output data enable = 3h

4 clock cycle delay from output data enable = 4h

5 clock cycle delay from output data enable = 5h

6 clock cycle delay from output data enable = 6h

7 clock cycle delay from output data enable = 7h

8h

Data Dec Rate

DCI

R

12

1h

current decimation rate for the output data

9h

Ram Dec Rate

DCI

R

12

1h

current decimation rate for the RAM data

Ah

Bypass Mode

DCI

R

1

0h

current mode select

non-bypass = 0h

bypass mode = 1h

Bh

Output Data Format

DCI

R

1

0h

current data format select

data not rounded = 0h

data rounded to 16 bits = 1h

Ch

Ram Data Format

DCI

R

1

0h

current RAM data format select

data not rounded = 0h

data rounded to 16 bits = 1 h

5000h

Dh

Scale Format

DCI

R

3

0h

current scale format for Output data

output is input (round 16) data Bit 31, Bit 30:16 = 0h

output is input (round 16) data Bit 31, Bit 29:15 = 1h

output is input (round 16) data Bit 31. Bit 28:14 = 2h

output is input (round 16) data Bit 31, Bit 27:13 = 3h

output is input (round 16) data Bit 31, Bit 26:12 = 4h

output is input (round 16) data Bit 31. Bit 25:11 = 5h

output is input (round 16) data Bit 31, Bit 24:10 = 6h

output is input (round 16) data Bit 31. Bit 23:9 = 7h

Eh

RAM Scale Format

DCI

R

3

0h

current scale format for RAM data

output is input (round 16) data Bit 31, Bit 30:16 = 0h

output is input (round 16) data Bit 31, Bit 29:15 = 1h

output is input (round 16) data Bit 31, Bit 28:14 = 2h

output is input (round 16) data Bit 31. Bit 27:13 = 3h

output is input (round 16) data Bit 31, Bit 26:12 = 4h

output is input (round 16) data Bit 31, Bit 25:11 = 5h

output is input (round 16) data Bit 31, Bit 24:10 = 6h

output is input (round 16) data Bit 31, Bit 23:9 = 7h

Fh

Data Enable Delayed

DCI

R

4

1h

current data enable delayed

0 clock cycle delay from output data enable = 0h

1 clock cycle delay from output data enable = 1h

2 clock cycle delay from output data enable = 2h

3 clock cycle delay from output data enable = 3h

4 clock cycle delay from output data enable = 4h

5 clock cycle delay from output data enable = 5h

6 clock cycle delay from output data enable = 6h

7 clock cycle delay from output data enable = 7h

6000h

000

Ch1 Mem

DCM

R/W

16

NA

Channel 1 capture memory

1FFh

200-

Ch2 Mem

DCM

R/W

16

NA

Channel 2 capture memory

3FFh

400h

Buffered Control

DCM

R/W

16

0h

Buffered Data capture control register

Bit 0 = 1 - Capture On Sync

Bit 1 = 1 - Snapshot Burst Out

Bit 2 = 1 - Snapshot Feedback

Bits 4,5 - Capture select 00b = DSI.

01b = DCI, 10b = DCF

Bit 11 = 1 - Capture Complete

Bit 15 = 1 - Reset (Note: Read back at 0b after you

write a 1b)

Bits 3.6.7,8,9.10,13,14 - No function

401h

Dly_BHi

DCM

R/W

4

0h

Delay Counter Buffered High Byte

402h

Dly_BLo

DCM

R/W

16

1h

Delay Counter Buffered Low Byte

404h

Control

DCM

R

16

0h

Data capture control register

Bit 0 = 1 - Capture On Sync

Bit 1 = 1 - Snapshot Burst Out

Bit 2 = 1 - Snapshot Feedback

Bits 4,5 - Capture select 00b = DSI,

01b = DCI. 10b = DCF

Bit 11 = 1 - Capture Complete

Bit 15 = 1 - Reset (Note: Read back at 0b after you

write a 1b)

Bits 3,6,7.8,9,10,13,14 - No function

405h

Dly_Hi

DCM

R

4

0h

Delay Counter High Byte

406h

Dly_Lo

DCM

R

16

1h

Delay Counter Low Byte

7000h

0h

Sync control

TCI

R/W

16

0h

Sync control for all modules

Bit C - Sync Select 0b = CPU lb = External

Bit 1 = Sync Source 0b = CPI 1b = PDI

Bit 2 = Sync on/off 0b= Off 1b = On

Bit 3 = Sync Mode Change

1h

SPD control

TCI

R/W

16

0h

Bits 0,1 = SPD Sync Source 00b -NOP, 01b - CPU

10b - Delay, 11b - External

Bit 8 - CPU Dump Control 0b = Off, 01b = On

Bit 10 - CPU Enable Control 0b = Off, 01b = On

Bit 12 - Armed 0b = Off, 01b = On

Bit 15 - SPD timing reset 0b = Off, 01b = On

Bits 2.3,4,5,6,7.9,11,13,14 No function

2h

SPD Delay High

TCI

R/W

4

0h

SPD delay counter high byte

3h

SPD Delay Low

TCI

R/W

16

1h

SPD delay counter low byte

4h

SPD Enable High

TCI

R/W

4

0h

SPD enable counter high byte

5h

SPD Enable Low

TCI

R/W

16

1h

SPD enable counter low byte

6h

DOC control

TCI

R/W

16

0h

Bits 0,1 = DOC Sync Source 00b -NOP, 01b - CPU

lCb - Delay, 1 lb - External

Bit 8 - CPU Dump Control 0b = Off, 01b = On

Bit 10 - CPU Enable Control 0b = Off, 01b = On

Bit 12 - Armed 0b = Off, 01b = On

Bit 15 - SPD timing reset 0b = Off, 01b = On

Bits 2.3,4,5.6,7,9,11,13.14 No function

7h

DOC Delay High

TCI

R/W

8

0h

DOC delay counter high byte

8h

DOC Delay Low

TCI

R/W

16

1h

DOC delay counter low byte

9h

DOC Enable High

TCI

R/W

8

0h

DOC enable counter high byte

Ah

DOC Enable Low

TCI

R/W

16

1h

DOC enable counter low byte

8000h

0h

Data Dec Rate Buf

DCF

R/W

12

1h

buffered decimation rate for the output data

1h

Ram Dec Rate Buf

DCF

R/W

12

1h

buffered decimation rate for the RAM data

2h

Bypass Mode Buf

DCF

R/W

1

0h

buffered bypass mode or data path select

data path = 0h

bypass mode = 1h

3h

Output Data Format

DCF

R/W

2

0h

buffered data format select

Buf

data not rounded = 0h

round to 16 bits = 1h

4h

Ram Data Format Buf

DCF

R/W

1

0h

buffered RAM data format select

data not rounded = 0h

round to 16 bits = 1h

5h

Scale Format Buf

DCF

R/W

3

0h

buffered scale format for output data

output is input (round 16) data Bit 31, Bit 30:16 = 0h

output is input (round 16) data Bit 31, Bit 29:15 = 1h

output is input (round 16) data Bit 31, Bit 28:14 = 2h

output is input (round 16) data Bit 31, Bit 27:13 = 3h

output is input (round 16) data Bit 31, Bit 26:12 = 4h

output is input (round 16) data Bit 31, Bit 25:11 = 5h

output is input (round 16) data Bit 31, Bit 24:10 = 6h

output is input (round 16) data Bit 31, Bit 23:9 = 7h

8000h

6h

RAM Scale Format Buf

DCF

R/W

3

0h

buffered scale format for RAM data

output is input (round 16) data Bit 31, Bit 30:16 = 0h

output is input (round 16) data Bit 31, Bit 29:15 = 1h

output is input (round 16) data Bit 31, Bit 28:14 = 2h

output is input (round 16) data Bit 31, Bit 27:13 = 3h

output is input (round 16) data Bit 31, Bit 26:12 = 4h

output is input (round 16) data Bit 31, Bit 25:11 = 5h

output is input (round 16) data Bit 31, Bit 24:10 = 6h

output is input (round 16) data Bit 31, Bit 23:9 = 7h

8h

Data Dec Rate

DCF

R

12

1h

current decimation rate for the output data

9h

RAM Dec Rate

DCF

R

12

1h

current decimation rate forthe RAM data

Ah

Bypass Mode

DCF

R

1

0h

current bypass mode or data path select

data path = 0h

bypass mode = 1h

Bh

Output Data Format

DCF

R

2

0h

current data format select

data not rounded = 0h

round to 16 bits = 1h

Ch

RAM Data Format

DCF

R

1

0h

current RAM data format select

data not rounded = 0h

round to 16 bits = 1h

8000h

Dh

Scale Format

DCF

R

3

0h

current scale format for output data

output is input (round 16) data Bit 31, Bit 30:16 = 0h

output is input (round 16) data Bit 31, Bit 29:15 = 1h

output is input (round 16) data Bit 31, Bit 28:14 = 2h

output is input (round 16) data Bit 31, Bit 27:13 = 3h

output is input (round 16) data Bit 31, Bit 26:12 = 4h

output is input (round 16) data Bit 31, Bit 25:11 = 5h

output is input (round 16) data Bit 31, Bit 24:10 = 6h

output is input (round 16) data Bit 31, Bit 23:9 = 7h

Eh

RAM Scale Format

DCF

R

3

0h

current scale format for RAM data

output is input (round 16) data Bit 31, Bit 30:16 = 0h

output is input (round 16) data Bit 31, Bit 29:15 = 1h

output is input (round 16) data Bit 31, Bit 28:14 = 2h

output is input (round 16) data Bit 31, Bit 27:13 = 3h

output is input (round 16) data Bit 31, Bit 26:12 = 4h

output is input (round 16) data Bit 31, Bit 25:11 = 5h

output is input (round 16) data Bit 31, Bit 24:10 = 6h

output is input (round 16) data Bit 31, Bit 23:9 = 7h

9000h

00-07h

Buf Coefficients Mod 0

FRB

R/W

16

0h

Buffered Module 0 Tap 0-7 coefficients

08-0Fh

Buf Coefficients Mod 1

FRB

R/W

16

0h

Buffered Module 1 Tap 0-7 coefficients

10-17h

Buf Coefficients Mod 2

FRB

R/W

16

0h

Buffered Module 2 Tap 0-7 coefficients

18-1Fh

Buf Coefficients Mod 3

FRB

R/W

16

0h

Buffered Module 3 Tap 0-7 coefficients

20-27h

Buf Coefficients Mod 4

FRB

R/W

16

0h

Buffered Module 4 Tap 0-7 coefficients

28-2Fh

Buf Coefficients Mod 5

FRB

R/W

16

0h

Buffered Module 5 Tap 0-7 coefficients

30-37h

Buf Coefficients Mod 6

FRB

R/W

16

0h

Buffered Module 6 Tap 0-7 coefficients

38-3Fh

Buf Coefficients Mod 7

FRB

R/W

16

0h

Buffered Module 7 Tap 0-7 coefficients

40h

Buf Mode Register 1

FRB

R/W

16

0h

Buffered Mode 1 Control register

Data Bit 0 = 1; Enable ch2DataMuxEnRsig

Data Bit 1 = 1; Enable ch2ABDataMuxEnRSig

Data Bit 2 = 1; Enable ch2DataMuxEnRSig

Data Bit 3 = 1; Enable ch2ABDataMuxEnRsig

Data Bit 4 = 1; Enable ch1MultEnRSig

Data Bit 5 = 1; Enable ch2MultEnRSig

Data Bit 6 = 1; Enable ch1RndEnRSig

Data Bit 7 = 1; Enable ch2RndEnRsig

Data Bit 8 = 1; Enable ch1MuxEnRSig

Data Bit 9 = 1; Enable ch1SumMuxEnRSig

Data Bit 10 = 1; Enable ch2MuxEnRSig

Data Bit 11 = 1; Enable ch2SumMux2EnRSig

Data Bit 12 = 1; Enable crossCoupledEnRSig

Data Bit 13 = 1; Enable sumEnRSig

Data Bit 14 = 1; Enable dataEnSelRSig

Data Bit 15 = 1; Enable allTapMuxEnRSig

Data Bit 15 = 1; Enable allTapMuxEnRSig

80h

Buf. Mode Register 2

FRB

R/W

16

0h

Buffered Mode 2 Control register

Data Bit 0-14: No function

Data Bit 15 = 1: Enable firClr

9000h

100-

Coefficients Mod 0

FRB

R

16

0h

Module 0 Tap 0-7 coefficients

107h

108-

Coefficients Mod 1

FRB

R

16

0h

Module 1 Tap 0-7 coefficients

10Fh

110-

Coefficients Mod 2

FRB

R

16

0h

Module 2 Tap 0-7 coefficients

117h

118-

Coefficients Mod 3

FRB

R

16

0h

Module 3 Tap 0-7 coefficients

11Fh

120-

Coefficients Mod 4

FRB

R

16

0h

Module 4 Tap 0-7 coefficients

127h

128-

Coefficients Mod 5

FRB

R

16

0h

Module 5 Tap 0-7 coefficients

12Fh

130-

Coefficients Mod 6

FRB

R

16

0h

Module 6 Tap 0-7 coefficients

137h

138-

Coefficients Mod 7

FRB

R

16

0h

Module 7 Tap 0-7 coefficients

13Fh

140h

Mode Register 1

FRB

R

16

0h

Mode 1 Control register

Data Bit 0; Read ch2DataMuxEnRSig

Data BIt 1; Read ch2ABDataMuxEnRSig

Data Bit 2; Read ch2DataMuxEnRSig

Data Bit 3; Read ch2ABDataMuxEnRSig

Data Bit 4; Read ch1MultEnRsig

Data Bit 5; Read ch2MultEnRSig

Data Bit 6; Read ch1RndEnRSig

Data Bit 7; Read ch2RndEnRSig

Data Bit 8; Read ch1MuxEnRSig

Data Bit 9; Read ch1SumMux2EnRSig

Data Bit 10; Read ch2MuxEnRsig

Data Bit 11; Read ch2SumMux2EnRSig

Data Bit 12; Read crossCoupledEnRSig

Data Bit 13; Read sumEnRSig

Data Bit 14; Read dataEnSelRSig

Data Bit 15; Read allTapMuxEnRSig

Data Bit 15; allTapMuxEnRSig

180h

Mode Register 2

FRB

R

16

0h

Mode 2 Control register

Data Bit 0-14; No function

Data Bit 15 = 1; Read firClr

Accordingly,

General purpose filter

Information

Patent Number

Date Filed

Date Issued

Inventors

Original Assignees

Examiners

Agents

CPC

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Abstract

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