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W3E32M64S-333BC Datasheet(PDF) 8 Page - White Electronic Designs Corporation |
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W3E32M64S-333BC Datasheet(HTML) 8 Page - White Electronic Designs Corporation |
8 / 17 page W3E32M64S-XBX 8 White Electronic Designs Corporation • (602) 437-1520 • www.wedc.com White Electronic Designs July 2006 Rev. 3 COMMAND READ NOP NOP NOP CL = 2.5 DON'T CARE TRANSITIONING DATA DQ DQS T0 T1 T2 T2n T3 T3n COMMAND READ NOP NOP NOP CL = 2 DQ DQS CLK CLK T0 T1 T2 T2n T3 T3n Burst Length = 4 in the cases shown Shown with nominal tAC and nominal tDSDQ DATA CLK CLK FIGURE 4 – CAS LATENCY FIGURE 5 – EXTENDED MODE REGISTER DEFINITION DLL Enable Disable DLL DS A9 A7 A6 A5 A4 A3 A8 A2 A1 A0 Extended Mode Register (Ex) Address Bus Operating Mode A10 A11 11 01 BA0 BA1 E0 0 1 Drive Strength Normal Reduced E1 0 1 Operating Mode Reserved Reserved E1, E0 Valid - E12 0 - E10 0 - E9 0 - E8 0 - E7 0 - E6 0 - E5 0 - E4 0 - E3 0 - A12 E11 0 - 1. E14 and E13 must be "0, 1" to select the Extended Mode Register (vs. the base Mode Register) 2. The QFC function is not supported. E2 0 - allowed as long as it does not interrupt the data transfer in the current bank and does not violate any other timing parameters. Input A10 determines whether one or all banks are to be precharged, and in the case where only one bank is to be precharged, inputs BA0, BA1 select the bank. Otherwise BA0, BA1 are treated as “Don’t Care.” Once a bank has been precharged, it is in the idle state and must be activated prior to any READ or WRITE commands being issued to that bank. A PRECHARGE command will be treated as a NOP if there is no open row in that bank (idle state), or if the previously open row is already in the process of precharging. AUTO PRECHARGE AUTO PRECHARGE is a feature which performs the same individual-bank PRECHARGE function described above, but without requiring an explicit command. This is accomplished by using A10 to enable AUTO PRECHARGE in conjunction with a specific READ or WRITE command. A precharge of the bank/row that is addressed with the READ or WRITE command is automatically performed upon completion of the READ or WRITE burst. AUTO PRECHARGE is non persistent in that it is either enabled or disabled for each individual READ or WRITE command. The device supports concurrent auto precharge if the command to the other bank does not interrupt the data transfer to the current bank. AUTO PRECHARGE ensures that the precharge is initiated at the earliest valid stage within a burst. This “earliest valid stage” is determined as if an explicit precharge command was issued at the earliest possible time, without violating tRAS (MIN).The user must not issue another command to the same bank until the precharge time (tRP) is completed. BURST TERMINATE The BURST TERMINATE command is used to truncate READ bursts (with auto precharge disabled). The most recently registered READ command prior to the BURST TERMINATE command will be truncated. The open page which the READ burst was terminated from remains open. |
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