W949D6DB Datasheet, PDF (21/60 Pages) Winbond – Standard Self Refresh Mode

W949D6DB / W949D2DB
7.6.3 Truth Table - DM Operations
FUNCTION
DM
DQ
Write Enable
L
Valid
Write Inhibit
H
X
Note:
1. Used to mask write data, provided coincident with the corresponding data.
NOTES
1
1
7.6.4 Truth Table – CKE
CKEn-1 CKEn CURRENT STATE
COMMAND n
ACTION n
NOTES
L
L
Power Down
X
Maintain Power Down
L
L
Self Refresh
X
Maintain Self Refresh
L
L
Deep Power Down
X
Maintain Deep Power Down
L
H
Power Down
NOP or DESELECT
Exit Power Down
5, 6, 9
L
H
Self Refresh
NOP or DESELECT
Exit Self Refresh
5, 7, 10
L
H
Deep Power Down
NOP or DESELECT
Exit Deep Power Down
5, 8
H
L
All Banks Idle
NOP or DESELECT Precharge Power Down Entry 5
H
L
Bank(s) Active
NOP or DESELECT
Active Power Down Entry
5
H
L
H
L
H
H
All Banks Idle
All Banks Idle
AUTO REFRESH
Self Refresh Entry
BURST TERMINATE
Enter Deep Power Down
See the other Truth Tables
Notes:
1. CKEn is the logic state of CKE at clock edge n; CKEn-1 was the state of CKE at the previous clock edge.
2. Current state is the state of LPDDR immediately prior to clock edge n.
3. COMMAND n is the command registered at clock edge n, and ACTION n is the result of COMMAND n.
4. All states and sequences not shown are illegal or reserved.
5. DESELECT and NOP are functionally interchangeable.
6. Power Down exit time (tXP) should elapse before a command other than NOP or DESELECT is issued.
7. SELF REFRESH exit time (tXSR) should elapse before a command other than NOP or DESELECT is issued.
8. The Deep Power-Down exit procedure must be followed as discussed in the Deep Power-Down section of the Functional
Description.
9. The clock must toggle at least once during the tXP period.
10. The clock must toggle at least once during the tXSR time.
- 21 -
Publication Release Date: Oct. 08, 2014
Revision: A01-003