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are now commonly designated with "PC"-prefixed numbers (PC66, PC100 or PC133 - although the actual meaning of the numbers has changed).

Control signals

All commands are timed relative to the rising edge of a clock signal. In addition to the clock, there are six control signals, mostly active low, which are sampled on the rising edge of the clock:
* CKE clock enable. When this signal is low, the chip behaves as if the clock has stopped. No commands are interpreted and command

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