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参数资料
| 型号： | MT18HTF12872G-40EC2 |
| 元件分类： | DRAM |
| 英文描述： | 128M X 72 DDR DRAM MODULE, 0.6 ns, DMA240 |
| 封装： | DIMM-240 |
| 文件页数： | 6/36页 |
| 文件大小： | 672K |
| 代理商： | MT18HTF12872G-40EC2 |
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512MB, 1GB, 2GB (x72, REGISTERED)
PC2-3200, PC2-4300, 240-Pin DDR2 SDRAM DIMM
09005aef80e5e626
Micron Technology, Inc., reserves the right to change products or specifications without notice.
HTF18C64_128_256x72G_A.fm - Rev. A 9/03 EN
14
2003 Micron Technology. Inc.
Figure 8: READ Latency
Figure 9: Write Latency
Extended Mode Register 2 (EMR2)
The Extended Mode Register 2 (EMR2) controls
functions beyond those controlled by the mode regis-
ter. Currently all bits in EMR2 are reserved as shown in
Figure 10. The EMR2 is programmed via the LOAD
MODE command and will retain the stored informa-
tion until it is programmed again or the device loses
power. Reprogramming the extended mode register
will not alter the contents of the memory array, pro-
vided it is performed correctly.
The extended mode register must be loaded when
all device banks are idle and no bursts are in progress,
and the controller must wait the specified time tMRD
before initiating any subsequent operation. Violating
either of these requirements could result in unspeci-
fied operation.
Figure 10: Extended Mode Register 2
(EMR2) Definition
NOTE:
1GB and 2GB extended mode registers TBD.
DOUT
n + 3
DOUT
n + 2
DOUT
n + 1
CK
CK#
COMMAND
DQ
DQS, DQS#
AL = 2
ACTIVE n
Burst length = 4
Shown with nominal tAC, tDQSCK, and tDQSQ
T0
T1
T2
DON’T CARE
TRANSITIONING DATA
READ n
NOP
DOUT
n
T3
T4
T5
NOP
T6
NOP
T7
T8
NOP
CL = 3
RL = 5
CAS# latency (CL) = 3
Additive latency (AL) = 2
READ latency (RL) = AL + CL = 5
tRCD (MIN)
NOP
CK
CK#
COMMAND
DQ
DQS, DQS#
ACTIVE n
Burst length = 4
T0
T1
T2
DON’T CARE
TRANSITIONING DATA
NOP
T3
T4
T5
NOP
WRITE n
T6
NOP
Din
n + 3
Din
n + 2
Din
n + 1
WL = AL + CL - 1 = 4
T7
NOP
Din
n
CAS# latency (CL) = 3
Additive latency (AL) = 2
WRITE latency = AL + CL -1 = 4
tRCD (MIN)
NOP
AL = 2
CL - 1 = 2
A9
A7 A6 A5 A4 A3
A8
A2
A1 A0
Extended Mode
Register (Ex)
Address Bus
97
6
5
4
3
82
1
0
A10
A12 A11
BA0
BA1
10
11
12
13
* E12 (A12)–E0 (A0) are reserved for future
use and must all be programmed to '0.'
14
0
1
0
1
Mode Register
Mode Register (MR)
Extended Mode Register (EMR)
Extended Mode Register (EMR2)
Extended Mode Register (EMR3)
E14
0
0
1
E13
EMR(2) 0* 0*
0*
0* 0* 0* 0* 0* 0* 0* 0*
0* 0*
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MT18HTF12872JDY-667F1D4 | 制造商:Micron Technology Inc 功能描述:1GB 128MX72 DDR2 SDRAM MODULE COMMERCIAL PBF DIMM 1.8V FULLY - Bulk |
| MT18HTF12872M2DY-667F1B4 | 制造商:Micron Technology Inc 功能描述:1GB 128MX72 DDR2 SDRAM MODULE PBF DIMM 1.8V FULLY BUFFERED - Trays |
| MT18HTF12872M2DY-667F1B5 | 制造商:Micron Technology Inc 功能描述:1GB 128MX72 DDR2 SDRAM MODULE CUSTOM 1.8V FULLY BUFFERED - Trays |
| MT18HTF12872M2Y-53EF1 | 制造商:Micron Technology Inc 功能描述:1GB 128MX72 DDR2 SDRAM MODULE COMMERCIAL CUSTOM 1.8V REGISTE - Bulk |
| MT18HTF12872M3Y-53EF1 | 制造商:Micron Technology Inc 功能描述:1GB 128MX72 DDR2 SDRAM MODULE COMMERCIAL CUSTOM 1.8V REGISTE - Bulk |
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