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Write Datapath
R
Figure 3: Write Data Transmitted Using OSERDES
Figure 4: Write Strobe (DQS) and Data (DQ) Timing for a Write Latency of Four
D1
D2
D3
D4
CLKDIV CLK
CLKdiv_90
CLKfast_90
OSERDES
DQ
IOB ChipSync
TM
Circuit
Write
Data
Words
0-3
X721_03_080305
CLKfast_0
Clock Forwarded
to Memory Device
Command WRITE IDLE
D0 D1 D2 D3
Control (CS_L)
Strobe (DQS)
Data (DQ), OSERDES Output
X721_04_120505
CLKfast_90
March 2006 Memory Interfaces Solution Guide 57