Claims
- 1. A reversible Control In line driver, comprising:
- a first and a second current driver, each current driver coupled between a first reference voltage and a second reference voltage, for driving a differential output signal on a first output and a second output, wherein said first output is coupled to said first current driver and said second output is coupled to said second current driver; and
- a differential driver, coupled to said current drivers and responsive to an input differential signal, a transmit signal, and a REV.sub.-- EN signal, for:
- driving said output differential signal from said outputs responsive to said input differential signal when said transmit signal is asserted and said REV.sub.-- EN signal is deasserted, otherwise
- activating each said current driver when said transmit signal and said REV.sub.-- EN signal are deasserted; and otherwise
- deactivating each current driver when said REV.sub.-- EN signal is asserted.
- 2. The reversible Control In line driver of claim 1 wherein each current driver comprises a PMOS transistor and an NMOS transistor, wherein a drain of said PMOS transistor is coupled to a drain of said NMOS transistor, a source of said NMOS transistor is coupled to said first reference voltage, and a source of said PMOS transistor is coupled to said second reference voltage; and wherein
- said first output is coupled to said drain of said PMOS transistor of said first current driver and said second output is coupled to said drain of said PMOS transistor of said second current driver.
- 3. The reversible differential line driver of claim 2 wherein said current drivers and said differential driver are integrated into a semiconductor package.
- 4. The reversible differential line driver of claim 3 further comprising a terminating impedance coupled across said first and second outputs wherein said terminating impedance is not integrated into said semiconductor package.
- 5. A reversible Control In line driver, comprising:
- a first and a second MOS driver, each MOS driver comprising a PMOS transistor and an NMOS transistor, a drain of said PMOS transistor coupled to a drain of said NMOS transistor, a source of said NMOS transistor coupled to a first reference voltage, and a source of said PMOS transistor coupled to a second reference voltage;
- a first output coupled to said drain of said NMOS transistor of said first MOS driver;
- a second output coupled to said drain of said NMOS transistor of said second MOS driver; and
- a driver controller, coupled to a gate of each transistor of said MOS drivers and responsive to an input differential signal, a transmit signal, and a REV.sub.-- EN signal, for:
- driving an output differential signal from said outputs responsive to said input differential signal when said transmit signal is asserted and said REV.sub.-- EN signal is deasserted, otherwise
- activating each transistor of said MOS drivers when said transmit signal and said REV.sub.-- En signal are deasserted; and otherwise
- deactivating each transistor of said MOS drivers when said REV.sub.-- EN signal is asserted.
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a continuation of "REVERSIBLE AUI PORT FOR ETHERNET," U.S. patent application Ser. No. 08/391,912, filed Feb. 21, 1995, now pending. This application is related to "TWISTED PAIR MEDIUM ACCESS UNIT," U.S. patent application Ser. No. 08/224,946, now issued as U.S. Pat. No. 5,467,369 on Nov. 14, 1995, which is a Divisional of "METHOD AND APPARATUS FOR SQUELCH CIRCUIT IN NETWORK COMMUNICATION," Ser. No. 07/899,083, now issued as U.S. Pat. No. 5,327,465 on Jul. 5,1994, which is a Divisional of "MEDIUM ATTACHMENT UNIT FOR USE WITH TWISTED PAIR LOCAL AREA NETWORK," U.S. Pat. No. 5,164,960, and is related to "METHOD AND APPARATUS FOR CMOS DIFFERENTIAL DRIVE HAVING A RAPID TURN OFF," U.S. Pat. No. 5,263,049, which is also a Divisional of "MEDIUM ATTACHMENT UNIT FOR USE WITH TWISTED PAIR LOCAL AREA NETWORK," U.S. Pat. No. 5,164,960, all hereby expressly incorporated by reference for all purposes.
US Referenced Citations (5)
Continuations (1)
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Number |
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391912 |
Feb 1995 |
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