Discontinued (12/98 - last order; 9/99 last ship)
IBM0316409C IBM0316809C IBM0316169C
IBM03164B9C
16Mb Synchronous DRAM-Die Revision D
Current State Truth Table (Part 3 of 4) (Notes: 1)
Command
Current State
Action
Notes
CS RAS CAS WE A11
A10 - A0
OP Code
Description
L
L
L
L
L
L
L
L
H
L
L
L
L
L
L
L
L
H
L
L
L
L
L
L
L
L
H
L
L
L
L
L
H
L
Mode Register Set
ILLEGAL
X
X
X
Auto or Self Refresh ILLEGAL
No Operation; Bank(s) idle after tRP
ILLEGAL
L
H
H
L
BS
Precharge
L
H
L
BS Row Address Bank Activate
4
4
4
H
H
H
H
X
L
BS
BS
X
Column
Write
ILLEGAL
Precharging
L
H
L
Column
Read
ILLEGAL
No Operation; Bank(s) idle after tRP
No Operation; Bank(s) idle after tRP
No Operation; Bank(s) idle after tRP
ILLEGAL
H
H
X
L
X
X
X
Burst Termination
No Operation
Device Deselect
Mode Register Set
H
X
L
X
X
OP Code
L
L
H
L
X
X
X
Auto or Self Refresh ILLEGAL
L
H
H
L
BS
Precharge
ILLEGAL
4
4, 10
4
L
H
L
BS Row Address Bank Activate
ILLEGAL
H
H
H
H
X
L
BS
BS
X
Column
Write
ILLEGAL
Row Activating
L
H
L
Column
Read
ILLEGAL
4
No Operation; Row Active after tRCD
No Operation; Row Active after tRCD
No Operation; Row Active after tRCD
ILLEGAL
H
H
X
L
X
X
X
Burst Termination
No Operation
Device Deselect
Mode Register Set
H
X
L
X
X
OP Code
L
L
H
L
X
X
X
Auto or Self Refresh ILLEGAL
L
H
H
L
BS
Precharge
ILLEGAL
4
4
9
9
L
H
L
BS Row Address Bank Activate
ILLEGAL
Write
Recovering
H
H
H
H
X
BS
BS
X
Column
Write
Start Write; Determine if Auto-Precharge
Start Read; Determine if Auto-Precharge
No Operation; Row Active after tDPL
No Operation; Row Active after tDPL
No Operation; Row Active after tDPL
L
H
L
Column
Read
H
H
X
X
X
X
Burst Termination
No Operation
Device Deselect
H
X
X
X
1. CKE is assumed to be active (high) in the previous cycle for all entries. The Current State is the state of the bank that the Com-
mand is being applied to.
2. Both Banks must be idle; otherwise it is an illegal action.
3. If CKE is active (high), the SDRAM will start the Auto (CBR) Refresh operation. If CKE is inactive (low), then the Self Refresh mode
is entered.
4. The Current State only refers to one of the banks. If BS selects this bank, then the action is illegal. If BS selects the bank not being
referenced by the Current State, then the action may be legal depending on the state of that bank.
5. If CKE is inactive (low), then the Power Down mode is entered. Otherwise there is a No Operation.
6. The minimum and maximum Active time (tRAS) must be satisfied.
7. The RAS to CAS Delay (tRCD) must occur before the command is given.
8. Column address A10 is used to determine if the Auto Precharge function is activated.
9. The command must satisfy any bus contention, bus turn around, and/or write recovery requirements.
10. The command is illegal if the minimum bank to bank delay time (tRRD) is not satisfied.
©IBM Corporation. All rights reserved.
Use is further subject to the provisions at the end of this document.
08J3348.E35853
5/98
Page 41 of 120
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