Method and apparatus for multiple latency synchronous pipelined

Details Method and apparatus for multiple latency synchronous pipelined Method and apparatus for multiple latency synchronous pipelined

1995-06-30

1997-08-05

Kim, Matthew M.

Static information storage and retrieval

Magnetic bubbles

Guide structure

395432, 365194, G06F 1200

Patent

active

056551053

ABSTRACT:
A multiple latency synchronous dynamic random access memory includes separate two and three latency control circuits driven by an input latch circuit. Commands received at the multiple latency synchronous dynamic random access memory are converted to a separate set of command signals clocked through an input latch circuit by a feedback reset signal, such that commands are pipelined for three latency operation. In response to the command signals, the two latency control circuit produces a set of control signals according to a two latency algorithm. In response to the same command signals, the three latency control circuit independently produces a set of three latency control signals according to a three latency algorithm. In two latency operation, access time for signal development is externally controlled, while in three latency operation access time is internally controlled. In three latency operation, signal development time is determined separately for reads and writes. Also, in three latency operation, data is clocked along a data input path with a write latency. The multiple latency synchronous dynamic random access memory includes a pair of output data paths having different delays, where the data path is selected according to two or three latency operation.

REFERENCES:
patent: 5325502 (1994-06-01), McLaury
patent: 5502835 (1996-03-01), Le et al.
patent: 5511024 (1996-04-01), Atwood et al.
patent: 5526506 (1996-06-01), Hyatt
patent: 5544124 (1996-08-01), Zagar et al.

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