AS4C128M16D2
EMRS(1) Programming
1
Address Field
BA1
BA0
A15*
~A13
A12
A11
A10
A9
A
8
A
7
A
6
A
5
A
4
A
3
A
2
A
1
A0
BA
2
0*1
OCD program
Rtt
Additive latency
D.I.C
DLL
Extended Mode Register
0
0
1
Qoff RDQS
DQS
Rtt
BA1
0
BA0
0
MRS mode
MRS
A6 A2
Rtt (NOMINAL)
0
0
1
1
0
1
0
1
ODT Disable
75 ohm
A0
DLL Enable
Enable
0
1
EMRS(1)
EMRS(2)
0
1
1
0
150 ohm
50 ohm
Disable
1
1
EMRS(3):Reserved
OCD operation
Additive Latency
A9 A8 A7
A5 A4 A3
0
0
0
1
0
0
1
0
0
1
0
0
OCD exit
Reserved
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
Reserved
2
3
Reserved
4
1
1
1
Enable OCD defaults
*
5
6
*
:
After setting to default, OCD mode needs to be exited by setting A9-A7
to 000.
Reserved
*
A12
0
Qoff (Optional)
Output Driver
Impendence
Driver
Size
A1
Output buffer enabled
Output buffer disabled
1
0
1
Normal
100%
60%
*: Outputs disabled- DQs, DQSs,DQSs, DQSs,
RDQS, RDQS. This feature is used in conjunction
with dimm IDD measurements when IDDQ is not
desired to be included.
Weak
A10
0
DQS
Enable
1
Disable
Strobe Function Matrix
A11
(RDQS Enable)
A10
(DQS Enable)
A11
0
RDQS Enable
Disable
RDQS/DM
DM
RDQS
Hi-z
DQS
DQS
DQS
DQS
DQS
DQS
DQS
Hi-z
0 (Disable)
0 (Disable)
1 (Enable)
1 (Enable)
0 (Enable)
1 (Disable)
0 (Enable)
1 (Disable)
1
Enable
DM
Hi-z
* If RDQS is enabled, the
RDQS
RDQS
RDQS
Hi-z
DQS
Hi-z
D M Function is disabled. RDQS is
active for reads and don’t care for
writes.
usage.
*1 : A14 and A15 is reserved for future
Confidential
10
Version 2.0 – Oct/2014
ALSC [ ALLIANCE SEMICONDUCTOR CORPORATION ]
