PSRAM for performing write-verify-read function

Details PSRAM for performing write-verify-read function PSRAM for performing write-verify-read function

2006-03-07

2006-03-07

Tran, Michael (Department: 2827)

Static information storage and retrieval

Read/write circuit

Testing

C365S222000

Reexamination Certificate

active

07009898

ABSTRACT:
A PSRAM performs a Write-Verify-Read function at a test mode, thereby easily analyzing defects. The PSRAM comprises a test mode decoder, a refresh control block and a precharge control block. The test mode decoder generates a test mode control signal for performing a WVR function when a test mode starts. The refresh control block selectively performs a refresh operation in response to the test mode control signal. The precharge control block selectively performs a precharge operation in response to the test mode control signal outputted from the test mode decoder. Here, the test mode control signal is activated at the test mode so that the refresh operation and the precharge operation are not performed.

REFERENCES:
patent: 5471430 (1995-11-01), Sawada et al.
patent: 5550394 (1996-08-01), Sukegawa et al.
patent: 5590086 (1996-12-01), Park et al.
patent: 5625597 (1997-04-01), Hirose

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