Lockout circuit and method for preventing metastability during t

Details Lockout circuit and method for preventing metastability during t Lockout circuit and method for preventing metastability during t

1994-07-15

1995-03-21

Popek, Joseph A.

Static information storage and retrieval

Read/write circuit

Data refresh

365233, G11C 700

Patent

active

054002893

ABSTRACT:
A circuit and method for preventing glitches from occurring during a termination of a self-refresh mode when a race condition exits between an external row address strobe signal* (RAS*) transitioning to an inactive state and an internally generated self-refresh timing signal transitioning to an inactive state. The circuit of the invention includes a pulse circuit for generating an active self-refresh cycle pulse and a lock out circuit. The lock out circuit is responsive to the external RAS* signal and the active self-refresh cycle pulse. The lock out circuit locks out the effect of the active self-refresh cycle pulse when an external RAS* signal transitions to an inactive state prior to the generation of the active self-refresh cycle pulse and locks out an effect of a transition of the external RAS* signal to an inactive state when the active self-refresh cycle pulse is present.

REFERENCES:
patent: 5295110 (1994-03-01), Sakakibara

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