W3E32M64SA-XB2X
FIGURE 4 – CAS LATENCY
FIGURE 5 – EXTENDED MODE
REGISTER DEFINITION
T0
T1
T2
T2n
T3
T3n
CLK#
CLK
A8 A7 A6 A5 A4 A3 A2 A1 A0
BA1 BA0 A12 A11 A10
A9
Address Bus
COMMAND
READ
NOP
NOP
NOP
Extended Mode
Register (Ex)
1
1
1
CL = 2
0
DS DLL
Operating Mode
DQS
DQ
E0
0
DLL
Enable
Disable
T0
T1
T2
T2n
T3
T3n
1
CLK#
CLK
E1
0
Drive Strength
Normal
COMMAND
READ
NOP
NOP
NOP
1
Reduced
CL = 2.5
DQS
DQ
E2
0
E1, E0
Valid
-
Operating Mode
Reserved
E12 E11 E10 E9 E8 E7 E6 E5 E4 E3
0
-
0
-
0
-
0
-
0
-
0
-
0
-
0
-
0
-
0
-
Burst Length = 4 in the cases shown
Shown with nominal tAC and nominal tDSDQ
-
Reserved
1. E14 and E13 must be "0, 1" to select the Extended Mode Register (vs. the base Mode Register)
2. The QFC function is not supported.
DATA
DON'T CARE
TRANSITIONING DATA
TRUTH TABLE – COMMANDS (NOTE 1)
NAME (FUNCTION)
CS#
H
L
RAS#
CAS#
WE#
X
ADDR
X
DESELECT (NOP) (9)
NO OPERATION (NOP) (9)
X
H
L
X
H
H
L
H
X
ACTIVE (Select bank and activate row) (3)
L
H
Bank/Row
Bank/Col
Bank/Col
X
READ (Select bank and column, and start READ burst) (4)
WRITE (Select bank and column, and start WRITE burst) (4)
BURST TERMINATE (8)
L
H
H
H
L
H
L
L
L
L
H
H
L
L
PRECHARGE (Deactivate row in bank or banks) ( 5)
AUTO REFRESH or SELF REFRESH (Enter self refresh mode) (6, 7)
LOAD MODE REGISTER (2)
L
L
Code
X
L
L
H
L
L
L
L
Op-Code
TRUTH TABLE – DM OPERATION
NAME (FUNCTION)
WRITE ENABLE (10)
WRITE INHIBIT (10)
DM
L
DQs
Valid
X
H
NOTES:
1. CKE is HIGH for all commands shown except SELF REFRESH.
2. A0-12 define the op-code to be written to the selected Mode Register. BA0, BA1 select either the
mode register (0, 0) or the extended mode register (1, 0).
6. This command is AUTO REFRESH if CKE is HIGH; SELF REFRESH if CKE is LOW.
7. Internal refresh counter controls row addressing; all inputs and I/Os are “Don’t Care” except for
CKE.
3. A0-12 provide row address, and BA0, BA1 provide bank address.
4. A0-8 provide column address; A10 HIGH enables the auto precharge feature (non persistent),
while A10 LOW disables the auto precharge feature; BA0, BA1 provide bank address.
5. A10 LOW: BA0, BA1 determine the bank being precharged. A10 HIGH: All banks precharged
and BA0, BA1 are “Don’t Care.”
8. Applies only to read bursts with auto precharge disabled; this command is undefined (and
should not be used) for READ bursts with auto precharge enabled and for WRITE bursts.
9. DESELECT and NOP are functionally interchangeable.
10. Used to mask write data; provided coincident with the corresponding data.
Microsemi Corporation reserves the right to change products or specifications without notice.
December 2014 © 2014 Microsemi Corporation. All rights reserved.
Rev. 1
8
Microsemi Corporation • (602) 437-1520 • www.microsemi.com/pmgp
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