BRIEF DESCRIPTION OF THE DRAWINGS
The above exemplary purpose, feature and advantage of the present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings wherein:
FIG. 1 is a block diagram showing a structural example of a buffer circuit according to a first exemplary embodiment of the present invention;
FIG. 2 is a block diagram showing a structural example of a write control unit in the first exemplary embodiment of the present invention;
FIG. 3 is a block diagram showing a structural example of a read control unit in the first exemplary embodiment of the present invention;
FIG. 4 is a block diagram showing a structural example of a data storage unit in the first exemplary embodiment of the present invention;
FIG. 5 is a block diagram showing a structural example of a buffer control unit in the first exemplary embodiment of the present invention;
FIG. 6 is a block diagram showing a detailed structural example of the buffer control unit in the first exemplary embodiment of the present invention;
FIG. 7 is a timing diagram showing an operation of the buffer circuit according to the first exemplary embodiment of the present invention in a state in which a value of a valid data amount counter is small;
FIG. 8 is a timing diagram showing an operation of the buffer circuit according to the first exemplary embodiment of the present invention in a state in which the value of the valid data amount counter increases;
FIG. 9 is a timing diagram showing an operation of the buffer circuit according to the first exemplary embodiment of the present invention in a state in which the increased value of the valid data amount counter decreases;
FIG. 10 is a block diagram showing a structural example of a buffer control unit in a second exemplary embodiment of the present invention;
FIG. 11 is a block diagram showing a detailed structural example of the buffer control unit in the second exemplary embodiment of the present invention;
FIG. 12 is a timing diagram showing an operation of a FIFO buffer circuit using the buffer control unit in the second exemplary embodiment of the present invention;
FIG. 13 is a block diagram showing a structural example of a conventional FIFO buffer circuit;
FIG. 14 is a block diagram showing a structural example of a write control unit in the conventional FIFO buffer circuit;
FIG. 15 is a block diagram showing a structural example of a read control unit in the conventional FIFO buffer circuit;
FIG. 16 is a block diagram showing a structural example of a data storage unit in the conventional FIFO buffer circuit; and
FIG. 17 a timing diagram showing an operation of a conventional FIFO buffer circuit.