Programmable status flag generator FIFO using gray code

Details Programmable status flag generator FIFO using gray code Programmable status flag generator FIFO using gray code

1989-08-14

1992-01-28

Popek, Joseph A.

Static information storage and retrieval

Read/write circuit

Including signal comparison

365221, 377 34, 341 98, G11C 700, H03K 1302

Patent

active

050848410

ABSTRACT:
A FIFO 12 has a status flag generator 14. The status flag generator 14 includes a register programmable to "N". It also includes two sets of gray-code counters and a register (22,23,21;26,25,24) that are driven by separate READ and WRITE CLKS. The registers and counters are connected to comparators (31-36) for generating a plurality of signals that are input to output latches (41-43). The status flag generator is capable of generating status signals of FULL, HALF-FULL, EMPTY, FULL-N and EMPTY+N. N is a user-defined number that is programmed into a register 20 that is selectively connected to one or more of the programmable gray-code counters (23,24).

REFERENCES:
patent: 3588461 (1971-06-01), Halsall
patent: 4780894 (1988-10-01), Watkins et al.
patent: 4873666 (1989-10-01), Lefebvre et al.

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