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W949D6CB / W949D2CB
512Mb Mobile LPDDR
6.11.2 Truth Table - Commands
NAME (FUNCTION)
CS
RAS CAS
WE
BA
A10/AP ADDR NOTES
DESELECT (NOP)
NO OPERATION (NOP)
ACTIVE (Select Bank and activate row)
READ (Select bank and column and start read burst)
READ with AP (Read Burst with Auto Precharge)
WRITE (Select bank and column and start write burst)
WRITE with AP (Write Burst with Auto Precharge)
BURST TERMINATE or enter DEEP POWER DOWN
PRECHARGE (Deactivate Row in selected bank)
PRECHARGE ALL (Deactivate rows in all banks)
AUTO REFRESH or enter SELF REFRESH
H
L
L
L
L
L
L
L
L
L
L
X
H
L
H
H
H
H
H
L
L
L
X
H
H
L
L
L
L
H
H
H
L
X
H
H
H
H
L
L
L
L
L
H
X
X
Valid
Valid
Valid
Valid
Valid
X
Valid
X
X
X
X
Row
L
H
L
H
X
L
H
X
X
X
Row
Col
Col
Col
Col
X
X
X
X
2
2
3
3
4, 5
6
6
7, 8, 9
MODE REGISTER SET
L
L
L
L
Valid
Op-code
10
Notes:
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
All states and sequences not shown are illegal or reserved.
DESELECT and NOP are functionally interchangeable.
Auto precharge is non-persistent. A10 High enables Auto precharge, while A10 Low disables Auto precharge.
Burst Terminate applies to only Read bursts with Autoprecharge disabled. This command is undefined and should not be
used for Read with Auto precharge enabled, and for Write bursts.
This command is BURST TERMINATE if CKE is High and DEEP POWER DOWN entry if CKE is Low.
If A10 is low, bank address determines which bank is to be precharged. If A10 is high, all banks are precharged and
BA0~BA1 are don?t care.
This command is AUTO REFRESH if CKE is High and SELF REFRESH if CKE is low.
All address inputs and I/O are ?don?t care? except for CKE. Int ernal refresh counters control bank and row addressing.
All banks must be precharged before issuing an AUTO-REFRESH or SELF REFRESH command.
BA0 and BA1 value select between MRS and EMRS.
CKE is HIGH for all commands shown except SELF REFRESH and DEEP POWER-DOWN.
Publication Release Date: Sep, 21, 2011
- 20 -
Revision A01-007
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