Datasheet

Accessing Mode Register: Starts with registration of a MODE REGISTER SET command and ends when tMRD has been
met. Once tMRD is met, the Mobile DDR SDRAM will be in an ‘all banks idle’ state.
Precharging All: Starts with the registration of a PRECHARGE ALL command and ends when tRP is met. Once tRP is met,
the bank will be in the idle state.
10. Not bank-specific; requires that all banks are idle and no bursts are in progress.
11. Not bank-specific. BURST TERMINATE affects the most recent READ burst, regardless of bank.
12. Requires appropriate DM masking.
13. A WRITE command may be applied after the completion of the READ burst; otherwise, a BURST TERMINATE must be
used to end the READ prior to asserting a WRITE command.
CURRENT
STATE
CS RAS CAS
WE
COMMAND ACTION NOTES
Any
H X X X DESELECT NOP or Continue previous Operation
L H H H NOP NOP or Continue previous Operation
Idle X X X X ANY Any command allowed to bank m
Row Activating,
Active, or
Precharging
L L H H ACTIVE Select and activate row
L H L H READ Select column & start read burst 8
L H L L WRITE Select column & start write burst 8
L L H L PRECHARGE Precharge
Read with Auto
Precharge
disabled
L L H H ACTIVE Select and activate row
L H L H READ Select column & start new read burst 8
L H L L WRITE Select column & start write burst 8,10
L L H L PRECHARGE Precharge
Write with Auto
Precharge
disabled
L L H H ACTIVE Select and activate row
L H L H READ Select column & start read burst 8, 9
L H L L WRITE Select column & start new write burst 8
L L H L PRECHARGE Precharge
Read with Auto
Precharge
L L H H ACTIVE Select and activate row
L H L H READ Select column & start new read burst 5, 8
L H L L WRITE Select column & start write burst 5, 8, 10
L L H L PRECHARGE Precharge
Write with Auto
Precharge
L L H H ACTIVE Select and activate row
L H L H READ Select column & start read burst 5, 8
L H L L WRITE Select column & start new write burst 5, 8
L L H L PRECHARGE Precharge
Table 9 – Current State BANK n- Command to BANK m
AS4C16M16MD1
256Mb MOBILE DDR SDRAM
Confidential
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Ver.1.1 Oct.2015