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W948D6FB / W948D2FB
256Mb Mobile LPDDR
6.11.3 Truth Table - DM Operations
FUNCTION
Write Enable
Write Inhibit
DM
L
H
DQ
Valid
X
NOTES
1
1
Notes:
1.
Used to mask write data, provided coincident with the corresponding data.
6.11.4 Truth Table - CKE
CKEn-1
L
L
L
L
L
L
H
H
H
H
CKEn
L
L
L
H
H
H
L
L
L
L
CURRENT STATE
Power Down
Self Refresh
Deep Power Down
Power Down
Self Refresh
Deep Power Down
All Banks Idle
Bank(s) Active
All Banks Idle
All Banks Idle
COMMANDn
X
X
X
NOP or DESELECT
NOP or DESELECT
NOP or DESELECT
NOP or DESELECT
NOP or DESELECT
AUTO REFRESH
BURST TERMINATE
ACTIONn
Maintain Power Down
Maintain Self Refresh
Maintain Deep Power Down
Exit Power Down
Exit Self Refresh
Exit Deep Power Down
Precharge Power Down Entry
Active Power Down Entry
Self Refresh Entry
Enter Deep Power Down
NOTES
5, 6, 9
5, 7, 10
5, 8
5
5
Notes:
H
H
See the other Truth Tables
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
CKEn is the logic state of CKE at clock edge n; CKEn-1 was the state of CKE at the previous clock edge.
Current state is the state of LPDDR SDRAM immediately prior to clock edge n.
COMMANDn is the command registered at clock edge n, and ACTIONn is the result of COMMANDn.
All states and sequences not shown are illegal or reserved.
DESELECT and NOP are functionally interchangeable.
Power Down exit time (tXP) should elapse before a command other than NOP or DESELECT is issued.
SELF REFRESH exit time (tXSR) should elapse before a command other than NOP or DESELECT is issued.
The Deep Power-Down exit procedure must be followed as discussed in the Deep Power-Down section of the Functional
Description.
The clock must toggle at least once during the tXP period.
The clock must toggle at least once during the tXSR time.
Publication Release Date : Oct, 15, 2012
- 21 -
Revision : A01-004
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