W949D6CB Datasheet, PDF (21/60 Pages) Winbond – 512Mb Mobile LPDDR

W949D6CB / W949D2CB
6.11.3 Truth Table - DM Operations
FUNCTION
DM
DQ
Write Enable
L
Valid
Write Inhibit
H
X
Notes:
1. Used to mask write data, provided coincident with the corresponding data.
512Mb Mobile LPDDR
NOTES
1
1
6.11.4 Truth Table - CKE
CKEn-1 CKEn CURRENT STATE
COMMANDn
ACTIONn
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 All Banks Idle
AUTO REFRESH
Self Refresh Entry
H
L All Banks Idle
BURST TERMINATE Enter Deep Power Down
H
H
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 SDRAM immediately prior to clock edge n.
3. COMMANDn is the command registered at clock edge n, and ACTIONn is the result of COMMANDn.
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.
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Publication Release Date: Sep, 21, 2011
Revision A01-007