W9425G8EH Datasheet, PDF (18/53 Pages) Winbond – 8M × 4 BANKS × 8 BITS DDR SDRAM

W9425G8EH
8.2 Function Truth Table
(Note 1)
CURRENT
STATE
CS RAS CAS WE ADDRESS
H X X XX
L H H XX
L H L H BS, CA, A10
L H L L BS, CA, A10
Idle
L L H H BS, RA
L L H L BS, A10
L L L HX
L L L L Op-Code
H X X XX
L H H XX
L H L H BS, CA, A10
L H L L BS, CA, A10
Row Active
L L H H BS, RA
L L H L BS, A10
L L L HX
L L L L Op-Code
H X X XX
L H H HX
L H H LX
L H L H BS, CA, A10
Read
L H L L BS, CA, A10
L L H H BS, RA
L L H L BS, A10
L L L HX
L L L L Op-Code
H X X XX
L H H HX
L H H LX
L H L H BS, CA, A10
Write
L H L L BS, CA, A10
L L H H BS, RA
L L H L BS, A10
L L L HX
L L L L Op-Code
COMMAND
DSL
NOP/BST
READ/READA
WRIT/WRITA
ACT
PRE/PREA
AREF/SELF
MRS/EMRS
DSL
NOP/BST
READ/READA
WRIT/WRITA
ACT
PRE/PREA
AREF/SELF
MRS/EMRS
DSL
NOP
BST
READ/READA
WRIT/WRITA
ACT
PRE/PREA
AREF/SELF
MRS/EMRS
DSL
NOP
BST
READ/READA
WRIT/WRITA
ACT
PRE/PREA
AREF/SELF
MRS/EMRS
ACTION
NOP
NOP
ILLEGAL
ILLEGAL
Row activating
NOP
Refresh or Self refresh
Mode register accessing
NOP
NOP
Begin read: Determine AP
Begin write: Determine AP
ILLEGAL
Precharge
ILLEGAL
ILLEGAL
Continue burst to end
Continue burst to end
Burst stop
Term burst, new read: Determine AP
ILLEGAL
ILLEGAL
Term burst, precharging
ILLEGAL
ILLEGAL
Continue burst to end
Continue burst to end
ILLEGAL
Term burst, start read: Determine AP
Term burst, start read: Determine AP
ILLEGAL
Term burst, precharging
ILLEGAL
ILLEGAL
NOTES
3
3
2
2
4
4
3
5
6
3
6, 7
6
3
8
- 18 -
Publication Release Date: Jul. 04, 2008
Revision A01