In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Coriolis wrote:

Ok I was wrong that it was a cypress part, never heard of United Microelectron Corp. Can you scare up a spec sheet for the chip? I can't find one so I can't verify if your timing is correct. The access time specified as the key metric (15ns) for your part is only the measure from address valid to data valid portion of the read/write cycle, this doesn't tell you what the cycle time is (start of address valid to start of next address valid). Your program must adhere to both the access timing and the cycle timing to properly use the device.

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