Polled FIFO flags

Details Polled FIFO flags Polled FIFO flags

1995-12-29

1997-09-16

Nguyen, Viet Q.

Static information storage and retrieval

Read/write circuit

Serial read/write

36518905, 36518907, 365239, 36518902, G11C 700

Patent

active

056687672

ABSTRACT:
A First-In-First-Out (FIFO) memory device having polled status flags to provide the status of the FIFO memory device when requested by an external source. The write pointer and the read pointer in the memory device specifies the memory location which is to be accessed during the next write operation or during the next read operation, respectively. The write pointer generates a value indicating the number of write operations that have been performed and the read pointer generates a value indicating the number of read operations that have been performed. In response to a polling signal from the external source, the FIFO memory device outputs the value indicating the number of locations that are currently written (i.e. used) or the value indicating the number of locations currently unwritten (i.e. available for use).

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