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EM636165VE-55 Datasheet(PDF) 11 Page - Etron Technology, Inc. |
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EM636165VE-55 Datasheet(HTML) 11 Page - Etron Technology, Inc. |
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11 / 74 page  EtronTech 1M x 16 SDRAM EM636165 Preliminary 11 Rev. 1.8 Nov 2001 6 Write and AutoPrecharge command (refer to the following figure) (RAS# = "H", CAS# = "L", WE# = "L", A11 = “V”, A10 = "H", A0-A7 = Column Address) The Write and AutoPrecharge command performs the precharge operation automatically after the write operation. Once this command is given, any subsequent command can not occur within a time delay of {(burst length -1) + tWR + tRP(min.)}. At full-page burst, only the write operation is performed in this command and the auto precharge function is ignored. CLK COM M AND T0 T1 T2T3 T4T5 T6T7 T8 NOP NOP NOP NOP NOP NOP NOP DIN A0 DIN A1 CAS# latency=1 tCK1, DQ's CAS# latency=2 tCK2, DQ's CAS# latency=3 tCK3, DQ's DIN A0 DIN A1 DIN A0 DIN A1 tDAL * * * tDAL= tWR + tRP * Begin AutoPrecharge Bank can be reactivated at completion of tDAL Bank A Activate Write A AutoPrecharge tDAL tDAL Burst Write with Auto-Precharge (Burst Length = 2, CAS# Latency = 1, 2, 3) 7 Mode Register Set command (RAS# = "L", CAS# = "L", WE# = "L", A11 = “V”, A10 = “V”, A0-A9 = Register Data) The mode register stores the data for controlling the various operating modes of SDRAM. The Mode Register Set command programs the values of CAS# latency, Addressing Mode and Burst Length in the Mode register to make SDRAM useful for a variety of different applications. The default values of the Mode Register after power-up are undefined; therefore this command must be issued at the power-up sequence. The state of pins A0~A9 and A11 in the same cycle is the data written to the mode register. One clock cycle is required to complete the write in the mode register (refer to the following figure). The contents of the mode register can be changed using the same command and the clock cycle requirements during operation as long as both banks are in the idle state. |
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