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32Gb, 64Gb, 128Gb, 256Gb Asynchronous/Synchronous NAND
Bus Operation – Synchronous Interface
Upon entering the DDR data output mode, DQS will toggle HIGH and LOW with a delay
of tDQSCK from the respective rising and falling edges of CLK. DQ[7:0] will output data
edge-aligned to the rising and falling edges of DQS, with the first transition delayed by
no more than tAC.
DDR data output mode continues as long as CLK is running, CE# is LOW, W/R# is LOW,
and ALE and CLE are HIGH on the rising edge of CLK.
To exit DDR data output mode, the following conditions must be met:
• CLK is running
• CE# is LOW
• W/R# is LOW
• ALE and CLE are latched LOW on the rising edge of CLK
The final two data bytes are output on DQ[7:0] on the final rising and falling edges of
DQS. The final rising and falling edges of DQS occur tDQSCK after the last cycle in the
data output sequence in which ALE and CLE are latched HIGH. After tCKWR, the bus
enters bus idle mode and tCAD begins on the next rising edge of CLK. Once tCAD starts
the host can disable the target if desired.
Data output requests are typically ignored by a die (LUN) that is busy (RDY = 0); howev-
er, it is possible to output data from the status register even when a die (LUN) is busy by
issuing the READ STATUS (70h) or READ STATUS ENHANCED (78h) command.
PDF: 09005aef836c9ded
Rev. F 12/09 EN
43
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