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EM638165BM-6H Datasheet(PDF) 9 Page - Etron Technology, Inc. |
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EM638165BM-6H Datasheet(HTML) 9 Page - Etron Technology, Inc. |
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9 / 53 page  EtronTech EM638165 Rev. 5.3 9 Dec. /2013 CLK COMMAND T0 T1 T2 T3 T4 T5 T6 NOP READ A NOP NOP NOP NOP WRITE B NOP T7 T8 NOP DQM DOUT A0 DIN B0 DIN B1 DIN B2 CAS# Latency=3 tCK3, DQ Must be Hi-Z before the Write Command Don’t Care Figure 8. Read to Write Interval (Burst Length ≧ 4, CAS# Latency = 3) CLK COMMAND T0 T1 T2 T3 T4 T5 T6 NOP NOP READ A NOP NOP WRITE B NOP NOP T7 T8 NOP DQM DIN B0 DIN B1 DIN B2 DIN B3 CAS# Latency=2 tCK2, DQ Must be Hi-Z before the Write Command Don’t Care Figure 9. Read to Write Interval (Burst Length ≥ 4, CAS# Latency = 2) A read burst without the auto precharge function may be interrupted by a BankPrecharge/ PrechargeAll command to the same bank. The following figure shows the optimum time that BankPrecharge/ PrechargeAll command is issued in different CAS latency. CLK COMMAND T0 T1 T2 T3 T4 T5 T6 READ A NOP NOP NOP Precharge NOP NOP Activate T7 T8 NOP CAS# Latency=2 tCK2, DQ CAS# Latency=3 tCK3, DQ DOUT A0 DOUT A1 DOUT A2 DOUT A3 DOUT A0 DOUT A1 DOUT A2 DOUT A3 ADDRESS Bank, Col A Bank (s) Bank Row tRP Figure 10. Read to Precharge (CAS# Latency = 2, 3) 5 Read and AutoPrecharge command (RAS# = "H", CAS# = "L", WE# = "H", BAs = Bank, A10 = "H", A0-A7 = Column Address) The Read and AutoPrecharge command automatically performs the precharge operation after the read operation. Once this command is given, any subsequent command cannot occur within a time delay of {tRP(min.) + burst length}. At full-page burst, only the read operation is performed in this command and the auto precharge function is ignored. |
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