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IC42S16101 Datasheet(PDF) 34 Page - Integrated Circuit Solution Inc |
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IC42S16101 Datasheet(HTML) 34 Page - Integrated Circuit Solution Inc |
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34 / 78 page  IC42S16101 34 Integrated Circuit Solution Inc. DR025-0F 01/17/2005 Burst Data Interruption U/LDQM Pins (Write Cycle) Burst data input can be temporarily interrupted (muted ) during a write cycle using the U/LDQM pins. Regardless of the CAS latency, as soon as one of the U/LDQM pins goes HIGH, the corresponding externally applied input data will no longer be written to the device internal circuits. Subsequently, the corresponding input continues to be muted as long as that U/LDQM pin remains HIGH. The IC42S16101 will revert to accepting input as soon as Burst Read and Single Write The burst read and single write mode is set up using the mode register set command. During this operation, the burst read cycle operates normally, but the write cycle only writes a single data item for each write cycle. The CAS latency and DQM latency are the same as in normal mode. that pin is dropped to LOW and data will be written to the device. This input control operates independently on a byte basis with the UDQM pin controlling upper byte input (pin I/O8 to I/O15) and the LDQM pin controlling the lower byte input (pins I/O0 to I/O7). Since the U/LDQM pins control the device input buffers only, the cycle continues internally and, inparticular, incrementing of the internal burst counter continues. WRITE A0 COMMAND I/O CLK DIN A0 WRITE (CA=A, BANK 0) WRITE A0 COMMAND UDQM LDQM I/O8-I/O15 I/O0-I/O7 CLK DIN A1 WRITE (CA=A, BANK 0) DATA MASK (LOWER BYTE) DATA MASK (UPPER BYTE) tDMD=0 DIN A2 DIN A3 DIN A0 DIN A3 Don’t Care CAS latency = 2, 3 CAS latency = 2, burst length = 4 |
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