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4
Operations and Functions
4.1
Command Table
Table 9 Command Overview
CKE
CKE
Operation
Code
n-1
n
Device Deselect
DESEL
H
X
No Operation
NOP
H
X
Mode Register Setup
MRS
H
X
Extended Mode Register Setup
MRS
H
X
Bank Activate
ACT
H
X
Read
READ
H
X
Read with Auto Precharge
READA
H
X
Write Command
WRITE
H
X
Write Command with Auto Precharge WRITEA
H
X
Burst Stop
BST
H
X
Precharge Single Bank
PRE
H
X
Precharge All Banks
PREAL
H
X
Auto Refresh
AREF
H
H
Self Refresh Entry
SREFEN
H
L
L
H
Self Refresh Exit
SREFEX
L
H
H
L
Power Down Mode Entry (Note 1)
PWDNEN
H
L
Power Down Mode Exit
PWDNEX
L
H
Note: 1: The Power Down Mode Entry command is illegal during Burst Read or Burst Write operations.
4.2
Function Truth Table I
Table 10
Function Truth Table I
Current
Command
Address
State
DESEL
X
NOP
NOP
X
NOP
BST
X
NOP
READ / READA
BA,CA,A8
ILLEGAL
IDLE
WRITE / WRITEA
BA,CA,A8
ILLEGAL
ACT
BA, RA
Bank Active
PRE / PREAL
BA, A8
NOP
AREF / SREF
X
AUTO-Refresh or Self-Refresh
MRS / EMRS
Op-Code
Mode Register Set or Extended Mode Register Set
DESEL
X
NOP
NOP
X
NOP
BST
X
NOP
READ / READA
BA, CA, A8
Begin Read, Determine Auto Precharge
ROW
WRITE / WRITEA
BA, CA, A8
Begin Write, Determine Auto Precharge
ACTIVE
ACT
BA, RA
ILLEGAL
PRE / PREAL
BA, A8
Precharge / Precharge All
AREF / SREF
X
ILLEGAL
MRS / EMRS
OP-Code
ILLEGAL
DESEL
X
Continue burst to end
NOP
X
Continue burst to end
BST
X
Terminate Burst
Terminate burst, Begin New Read, Determine Auto-
READ / READA
BA, CA, A8
Prechgarge
READ
WRITE / WRITEA
BA, CA, A8
ILLEGAL
ACT
BA, RA
ILLEGAL
PRE / PREAL
BA ,A8
Terminate Burst / Precharge
AREF / SREF
X
ILLEGAL
MRS / EMRS
Op-Code
ILLEGAL
DESEL
X
Continue burst to end, Precharge
NOP
X
Continue burst to end, Precharge
BST
BA
ILLEGAL
READ / READA
BA, CA, A8
ILLEGAL
READ with
Auto
WRITE / WRITEA
BA, CA, A8
ILLEGAL
Precharge
ACT
BA, RA
ILLEGAL
PRE / PREAL
BA ,A8
ILLEGAL
AREF / SREF
X
ILLEGAL
MRS / EMRS
Op-Code
ILLEGAL
A0-7
CS#
RAS#
CAS#
WE#
BA0
BA1
A8
A9-11
H
X
X
X
X
X
X
X
L
H
H
H
X
X
X
X
L
L
L
L
0
0
OPCODE
L
L
L
L
1
0
OPCODE
L
L
H
H
BA
BA
Row Address
L
H
L
H
BA
BA
L
Col.
L
H
L
H
BA
BA
H
Col.
L
H
L
L
BA
BA
L
Col.
L
H
L
L
BA
BA
H
Col.
L
H
H
L
X
X
X
X
L
L
H
L
BA
BA
L
X
L
L
H
L
X
X
H
X
L
L
L
H
X
X
X
X
L
L
L
H
X
X
X
X
H
X
X
X
X
X
X
X
L
H
H
H
X
X
X
X
H
X
X
X
X
X
X
X
L
H
H
H
X
X
X
X
H
X
X
X
X
X
X
X
L
valid
valid
valid
Action
Notes
3
3
3
1
1
4
9
9
1, 5
6
7
2, 7
1
1
1
Table 10
Function Truth Table I
Current
Command
Address
State
DESEL
X
NOP
X
BST
X
READ / READA
BA, CA, A8
WRITE
WRITE / WRITEA
BA, CA, A8
ACT
BA, RA
PRE / PREAL
BA ,A8
AREF / SREF
X
MRS / EMRS
OP-Code
DESEL
X
NOP
X
BST
X
READ / READA
BA, CA, A8
WRITE with
Auto
WRITE / WRITEA
BA, CA, A8
Precharge
ACT
BA, RA
PRE / PREAL
BA ,A8
AREF / SREF
X
MRS / EMRS
OP-Code
DESEL
X
NOP
X
BST
X
READ / READA
BA, CA, A8
ROW
WRITE / WRITEA
BA, CA, A8
ACTIVATING
ACT
BA, RA
PRE / PREAL
BA ,A8
AREF / SREF
X
MRS / EMRS
OP-Code
DESEL
X
NOP
X
BST
X
READ / READA
BA, CA, A8
PRECHARGE
WRITE / WRITEA
BA, CA, A8
ACT
BA, RA
PRE / PREAL
BA ,A8
AREF / SREF
X
MRS / EMRS
OP-Code
Table 10
Function Truth Table I
Current
Command
Address
State
DESEL
X
NOP
X
BST
X
READ / READA
BA, CA, A8
WRITE
WRITE / WRITEA
BA, CA, A8
RECOVERING
ACT
BA, RA
PRE / PREAL
BA ,A8
AREF / SREF
X
MRS / EMRS
OP-Code
DESEL
X
NOP
X
BST
X
READ / READA
BA, CA, A8
WRITE
RECOVERING
WRITE / WRITEA
BA, CA, A8
with AUTO-
PRECHARGE
ACT
BA, RA
PRE / PREAL
BA ,A8
AREF / SREF
X
MRS / EMRS
OP-Code
DESEL
X
NOP
X
BST
X
READ / READA
BA, CA, A8
REFRESH
WRITE / WRITEA
BA, CA, A8
ACT
BA, RA
PRE / PREAL
BA ,A8
AREF / SREF
X
MRS / EMRS
OP-Code
DESEL
X
NOP
X
BST
X
READ / READA
BA, CA, A8
(EXTENDED)
MODE
WRITE / WRITEA
BA, CA, A8
REGISTER
SET
ACT
BA, RA
PRE / PREAL
BA ,A8
AREF / SREF
X
MRS / EMRS
OP-Code
VGN-S36C/S36GP/S36LP/S36SP/S36TP/S38CP/S52B/
S62PS/S62PSY/S62S/S350F/S350FP/S360/S360P/S370F
1-14
Action
Notes
Continue burst to end
Continue burst to end
ILLEGAL
Terminate Burst, Begin Read, Determine Auto-
7, 8
Precharge.
Terminate Burst, Begin new Write, Determine Auto-
2, 7
Precharge
ILLEGAL
1
Terminate Burst , Precharge
8
ILLEGAL
ILLEGAL
Continue burst to end, Precharge
Continue burst to end, Precharge
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
1
ILLEGAL
1
ILLEGAL
ILLEGAL
NOP ( Row Active after t RCD )
NOP ( Row Active after t RCD )
NOP ( Row Active after t RCD )
ILLEGAL
1, 9
ILLEGAL
1, 9
ILLEGAL
1, 5
ILLEGAL
1, 6
ILLEGAL
ILLEGAL
NOP ( Row Idle after t RP )
NOP ( Row Idle after t RP )
NOP ( Row Idle after t RP )
ILLEGAL
1
ILLEGAL
1
ILLEGAL
1
NOP ( Row Idle after t RP )
1
ILLEGAL
ILLEGAL
Action
Notes
NOP (Row Active after t WR )
NOP (Row Active after t WR )
NOP (Row Active after t WR )
Begin Read, Determine Auto-Prechgarge
2
Begin Write, Determine Auto-Prechgarge
ILLEGAL
2
ILLEGAL
1, 10
ILLEGAL
ILLEGAL
NOP (Precharge after t WR )
NOP (Precharge after t WR )
NOP (Precharge after t WR )
ILLEGAL
1, 2
ILLEGAL
1
ILLEGAL
1
ILLEGAL
1
ILLEGAL
ILLEGAL
NOP (Idle after t RC )
NOP (Idle after t RC )
NOP (Idle after t RC )
ILLEGAL
ILLEGAL
ILLEGAL
11
ILLEGAL
ILLEGAL
ILLEGAL
NOP (Idle after two clocks)
NOP (Idle after two clocks)
NOP (Idle after two clocks)
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
Confidential
(J/AM/AO)
IC
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