PD45128441-I Datasheet, PDF (19/89 Pages) Elpida Memory – 128M-bit Synchronous DRAM 4-bank, LVTTL WTR (Wide Temperature Range)

µPD45128441-I, 45128841-I, 45128163-I
4.5 Command Truth Table for CKE
Current State
CKE /CS /RAS /CAS /WE Address
Action
Notes
n–1 n
Self refresh
H × × × × ××
INVALID, CLK (n – 1) would exit self refresh
L H H × × ××
L H L H H ××
L H L H L ××
L H L L × ××
Self refresh recovery
Self refresh recovery
ILLEGAL
ILLEGAL
L L × × × ××
Self refresh recovery H H H × × × ×
H H L H H ××
Maintain self refresh
Idle after tRC
Idle after tRC
H H L H L ××
H H L L × ××
H L H × × ××
ILLEGAL
ILLEGAL
ILLEGAL
H L L H H ××
H L L H L ××
H L L L × ××
ILLEGAL
ILLEGAL
ILLEGAL
Power down
H× × × × ×
L H H × × ××
L H L H H H×
L L × × × ××
INVALID, CLK (n – 1) would exit power down
EXIT power down → Idle
EXIT power down → Idle
Maintain power down mode
All banks idle
HHH× × ×
HH LH× ×
HH L LH ×
Refer to operations in Operative Command Table
Refer to operations in Operative Command Table
Refer to operations in Operative Command Table
H H L L L H×
CBR (auto) Refresh
H H L L L L Op-Code Refer to operations in Operative Command Table
HLH× × ×
Refer to operations in Operative Command Table
HLLH× ×
HL L LH×
Refer to operations in Operative Command Table
Refer to operations in Operative Command Table
H L L L L H×
Self refresh
1
H L L L L L Op-Code Refer to operations in Operative Command Table
L × × × × ××
Power down
1
Row active
H × × × × ××
Refer to operations in Operative Command Table
L × × × × ××
Any state other than H H × × × ×
Power down
1
Refer to operations in Operative Command Table
listed above
H L × × × ××
Begin clock suspend next cycle
2
L H × × × ××
Exit clock suspend next cycle
L L × × × ××
Maintain clock suspend
Notes 1. Self refresh can be entered only from the all banks idle state. Power down can be entered only from all
banks idle or row active state.
2. Must be legal command as defined in Operative Command Table.
Remark H = High level, L = Low level, × = High or Low level (Don't care)
Preliminary Data Sheet E0233N10
19