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Data for any WRITE burst can be truncated by a subsequent PRECHARGE command, as
pairs that are registered prior to the tWR period are written to the internal array, and
the same bank cannot be issued until tRP is met.
Figure 41: Data Input Timing
tDQSS
tDQSH tWPST
tDH
tDS
tDQSL
tDSS3 tDSH2
tDSH2
tDSS3
CK
CK#
T01
T1
T1n
T2
T2n
T3
DIN
b
Don’t Care
Transitioning Data
tWPRE
tWPRES
DQS4
DQ
DM5
Notes: 1. WRITE command issued at T0.
2. tDSH (MIN) generally occurs during tDQSS (MIN).
3. tDSS (MIN) generally occurs during tDQSS (MAX).
4. For x16, LDQS controls the lower byte; UDQS controls the upper byte. For x32, DQS0 con-
trols DQ[7:0], DQS1 controls DQ[15:8], DQS2 controls DQ[23:16], and DQS3 controls
DQ[31:24].
5. For x16, LDM controls the lower byte; UDM controls the upper byte. For x32, DM0 con-
trols DQ[7:0], DM1 controls DQ[15:8], DM2 controls DQ[23:16], and DM3 controls
DQ[31:24].
2Gb: x16, x32 Mobile LPDDR SDRAM
WRITE Operation
PDF: 09005aef83a73286
2gb_ddr_mobile_sdram_t69m.pdf - Rev. M 11/10 EN
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