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tWCS, tRWD, tAWD and tCWD are restrictive operating parameters in LATE WRITE and READ-MODIFY-WRITE cycles only. If tWCS > tWCS(min), the cycle is an EARLY WRITE cycle and the data output will remain an open circuit throughout the entire cycle. If tRWD > tRWD(min), tAWD > tAWD(min) and tCWD > tCWD(min), the cycle is READ-WRITE and the data output will contain data read from the selected cell. If neither of the above conditions is met, the state of I/O (at access time and until CAS and RAS or OE go back to VIH) is indeterminate. OE held high and WE taken low after CAS goes low result in a LATE WRITE ( OE - controlled) cycle. These parameters are referenced to CAS leading edge in EARLY WRITE cycles and WE leading edge in LATE WRITE or READ- MODIFY-WRITE cycles. During a READ cycle, if OE is low then taken HIGH before CAS goes high, I/O goes open, if OE is tied permanently low, a LATE WRITE or READ-MODIFY-WRITE operation is not possible. WRITE command is defined as WE going low. LATE WRITE and READ-MODIFY-WRITE cycles must have both tOFF2 and tOEH met (OE high during WRITE cycle) in order to ensure that the output buffers will be open during the WRITE cycles. The I/Os open during READ cycles once tOFFl or tOFF2 0ccur.
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