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K4H561638D-TCB0 Datasheet(PDF) 28 Page - Samsung semiconductor |
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K4H561638D-TCB0 Datasheet(HTML) 28 Page - Samsung semiconductor |
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28 / 53 page  - 28 - REV. 1.0 November. 2. 2000 128Mb DDR SDRAM 3.3.10 DM masking The DDR SDRAM has a data mask function that can be used in conjunction with data write cycle, not read cycle. When the data mask is activated (DM high) during write operation, DDR SDRAM does not accept the corresponding data.(DM to data-mask latency is zero). DM must be issued at the rising or falling edge of data strobe. Command < Burst Length=8 > WRITE NOP NOP NOP NOP NOP NOP NOP NOP DQS DQ ′s Din 0 Din 1 Din 2 Din 3 tDQSS DM Din 4 Din 5 Din 6 Din7 masked by DM=H 2 0 1 5 3 4 8 6 7 CK CK 6. When terminating a burst Read command, the BST command must be issued LBST (“BST Latency”) clock cycles before the clock edge at which the output buffers are tristated, where LBST equals the CAS latency for read operations. This is shown in previous page Figure with examples for CAS latency (CL) of 1.5, 2, 2.5, 3 and 3.5 (only selected CAS latencies are required by the DDR SDRAM standards, the others are optional). 7. When the burst terminates, the DQ and DQS pins are tristated. The BST command is not byte controllable and applies to all bits in the DQ data word and the(all) DQS pin(s). Figure 18. DM masking timing |
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