W942508CH Datasheet, PDF (31/47 Pages) Winbond – 8M x 4 BANKS x 8 BIT DDR SDRAM

Timing Waveforms, continued
10.4 Write Timing (Burst Length = 4)
CLK
tCH
tCL
tCK
CLK
W942508CH
CMD
WRIT
ADD
tIS tIH
Col
tDSH
tDSS
tDSH
tDSS
x4, x8 device
DQS
Input
(Data)
x16 device
LDQS
DQ0~7
tWPRES
tWPRE
tDQSH
tDQSL
tDQSH
tWPST
Preamble
tDS
Postamble
tDS
tDS
tDH
tDH
tDH
DA0
DA1
DA2
DA3
tDQSS
tWPRES
tWPRE
tDSH
tDQSH
tDSS
tDQSL
tDSH
tDQSH
tDSS
tWPST
Preamble
tDS
Postamble
tDS
tDS
tDH
tDH
tDH
DA0
DA1
DA2
DA3
UDQS
DQ8~15
tDQSS
tDSSK
tDSSK
tDSSK
tDSSK
tDSH
tDSS
tDSH
tDSS
tWPRES
tWPRE
tDQSH
tDQSL
tDQSH
tWPST
Preamble
tDS
tDH
DA0
DA1
tDS
tDS ^Postamble
tDH
tDH
DA2
DA3
tDQSS tDSH
Note: x16 has 2DQS’s (UDQS for uper byte and LDQS for lower byte). Even if one of the 2 bytes is not used, both UDQS and
LDQS must be toggled.
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Publication Release Date: May 21, 2003
Revision A3