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EM6A9325 Datasheet(PDF) 10 Page - Etron Technology, Inc. |
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EM6A9325 Datasheet(HTML) 10 Page - Etron Technology, Inc. |
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10 / 51 page  EtronTech 4M x 32 LPSDRAM EM6A9325 Preliminary 10 Rev 0.4 June 2003 CLK COM M AND T0 T1 T2T3 T4T5 T6T7 T8 DIN B2 NOP WRITE A NOP NOP NOP NOP NOP WRITE B NOP DIN A0 DIN B0 DIN B1 DQ's DIN B3 1 Clk Interval Write Interrupted by a Write (Burst Length = 4, CAS# Latency = 1, 2, 3) The Read command that interrupts a write burst without auto precharge function should be issued one cycle after the clock edge in which the last data-in element is registered. In order to avoid data contention, input data must be removed from the DQs at least one clock cycle before the first read data appears on the outputs (refer to the following figure). Once the Read command is registered, the data inputs will be ignored and writes will not be executed. CLK COMMAND T0 T 1 T2T3 T4T5 T6T7 T8 NOP WRITE A NOP NOP NOP NOP NOP READ B NOP DIN A0 don't care DOUT B2 DOUT B0 DOUT B1 DOUT B3 DIN A0 don't care don't care DOUT B2 DOUT B0 DOUT B1 DOUT B3 Input data for the write is masked. Input data must be removed from the DQ's at least one clock cycle before the Read data appears on the outputs to avoid data contention. CAS# latency=2 tCK2, DQ's CAS# latency=3 tCK3, DQ's Write Interrupted by a Read (Burst Length = 4, CAS# Latency = 2, 3) The BankPrecharge/PrechargeAll command that interrupts a write burst without the auto precharge function should be issued m cycles after the clock edge in which the last data-in element is registered, where m equals tWR/tCK rounded up to the next whole number. In addition, the DQM signals must be used to mask input data, starting with the clock edge following the last data-in element and ending with the clock edge on which the BankPrecharge/PrechargeAll command is entered (refer to the following figure). CLK T0 T1 T2 T3T4T5 T6 WRITE COMM AND BANK (S) ROW NOP NOP Precharge NOP NOP Activate BA N K COL n DI N n DIN n+1 DQM ADDRESS DQ tWR tRP : don't care Note: The DQMs can remain low in this example if the length of the write burst is 1 or 2. Write to Precharge |
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