W9751G6KB WINBOND [Winbond], W9751G6KB Datasheet - Page 50

• Manufacturer Part Number: W9751G6KB
• Description: 8M ? 4 BANKS ? 16 BIT DDR2 SDRAM
• Manufacturer: WINBOND [Winbond]

25. New units, „tCK(avg)‟ and „nCK‟, are introduced in DDR2-667, DDR2-800.
26. These parameters are measured from a command/address signal (CKE, CS , RAS , CAS , WE , ODT, BA0, A0, A1,
27. If tDS or tDH is violated, data corruption may occur and the data must be re-written with valid data before a valid READ can
28. These parameters are measured from a data strobe signal ((L/U)DQS/ DQS ) crossing to its respective clock signal (CLK/
29. These parameters are measured from a data signal ((L/U)DM, (L/U)DQ0, (L/U)DQ1, etc.) transition edge to its respective
etc.) transition edge to its respective clock signal (CLK/ CLK ) crossing. The spec values are not affected by the amount of
clock jitter applied (i.e. tJIT(per), tJIT(cc), etc.), as the setup and hold are relative to the clock signal crossing that latches
the command/address. That is, these parameters should be met whether clock jitter is present or not.
be executed.
are relative to the clock signal crossing. That is, these parameters should be met whether clock jitter is present or not.
data strobe signal ((L/U)DQS/ DQS ) crossing.
CLK ) crossing. The spec values are not affected by the amount of clock jitter applied (i.e. tJIT(per), tJIT(cc), etc.), as these
Unit „tCK(avg)‟ represents the actual tCK(avg) of the input clock under operation.
Unit „nCK‟ represents one clock cycle of the input clock, counting the actual clock edges.
Examples:
For DDR2-667/800: tXP = 2 [nCK] means; if Power Down exit is registered at Tm, an Active command may be
registered at Tm+2, even if (Tm+2 - Tm) is 2 x tCK(avg) + tERR(2per),min.
For DDR2-1066: tXP = 3 [nCK] means; if Power Down exit is registered at Tm, an Active command may be
registered at Tm+3, even if (Tm+3 - Tm) is 3 x tCK(avg) + tERR(3per),min.
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Publication Release Date: Dec. 09, 2011
W9751G6KB
Revision A01