Datasheet

Notes:
1. The table applies when both CKEn-1 and CKEn are HIGH, and after tXSR or tXP has been met if the previous state was
Self Refresh or Power Down.
2. DESELECT and NOP are functionally interchangeable.
3. All states and sequences not shown are illegal or reserved.
4. Current State Definitions:
Idle: The bank has been precharged, and tRP has been met.
Row Active: A row in the bank has been activated, and tRCD has been met. No data bursts/accesses and no register
accesses are in progress.
Read: A READ burst has been initiated, with Auto Precharge disabled, and has not yet terminated or been terminated.
Write: A Write burst has been initiated, with Auto Precharge disabled, and has not yet terminated or been terminated.
5. Read with AP enabled and Write
with AP enabled: The read with Auto Precharge enabled or Write with Auto Precharge
enabled states can be broken into two parts: the access period and the precharge period. For Read with AP, the
precharge period is defined as if the same burst was executed with Auto Precharge disabled and then followed with the
earliest possible PRECHARGE command that still accesses all the data in the burst. For Write with Auto precharge, the
precharge period begins when tWR ends, with tWR measured as if Auto Precharge was disabled. The access period
starts with registration of the command and ends where the precharge period (or tRP) begins. During the pre
charge period,
of the Read with Auto Precharge enabled or Write with Auto Precharge enabled states, ACTIVE, PRECHARGE, READ,
and WRITE commands to the other bank may be applied; during the access period, only ACTIVE and PRECHARGE
commands to the other banks may be applied. In either case, all other related limitations apply (e.g. contention between
READ data and WRITE data must be avoided).
6. AUTO REFRESH, SELF REFRESH, and MODE REGI
STER SET commands may only be issued when all bank are idle.
7. A BURST TERMINATE command cannot be issued to another bank; it applies to the bank represented by the current
state only.
8. READs or WRITEs listed in the Command column include READs and WRITEs with Auto Precharge enabled and READs
and WRITEs with Auto Precharge disabled.
9. Requires appropriate DM masking.
10. A WRITE command may be applied after the completion of data output, otherwise a BURST TERMINATE command must
be issued to end the READ prior to asserting a WRITE command.
AS4C16M16MD1
256Mb MOBILE DDR SDRAM
Confidential
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Ver.1.1 Oct.2015