參數(shù)資料
型號: MT47H128M8HV-187ELIT:E
元件分類: DRAM
英文描述: 128M X 8 DDR DRAM, 0.35 ns, PBGA60
封裝: 8 X 11.50 MM, FBGA-60
文件頁數(shù): 117/133頁
文件大?。?/td> 9170K
Extended Mode Register 2 (EMR2)
The extended mode register 2 (EMR2) controls functions beyond those controlled by
the mode register. Currently all bits in EMR2 are reserved, except for E7, which is used
in commercial or high-temperature operations, as shown in Figure 40. The EMR2 is pro-
grammed via the LM command and will retain the stored information until it is program-
med again or until the device loses power. Reprogramming the EMR will not alter the
contents of the memory array, provided it is performed correctly.
Bit E7 (A7) must be programmed as “1” to provide a faster refresh rate on IT and AT
devices if TC exceeds 85°C.
EMR2 must be loaded when all banks are idle and no bursts are in progress, and the
controller must wait the specified time tMRD before initiating any subsequent opera-
tion. Violating either of these requirements could result in an unspecified operation.
Figure 40: EMR2 Definition
A9
A7 A6 A5 A4 A3
A8
A2 A1 A0
Extended mode
register (Ex)
Address bus
9
7
6
5
4
3
8
2
1
0
A10
A12 A11
BA0
BA1
10
11
12
n
0
14
15
An2
E14
0
1
0
1
Mode Register Set
Mode register (MR)
Extended mode register (EMR)
Extended mode register (EMR2)
Extended mode register (EMR3)
E15
0
1
MRS
0
0 0 SRT 0
0
BA21
16
0
E7
0
1
SRT Enable
1X refresh rate (0°C to 85°C)
2X refresh rate (>85°C)
Notes: 1. E16 (BA2) is only applicable for densities
≥1Gb, reserved for future use, and must be pro-
grammed to “0.”
2. Mode bits (En) with corresponding address balls (An) greater than E12 (A12) are re-
served for future use and must be programmed to “0.”
1Gb: x4, x8, x16 DDR2 SDRAM
Extended Mode Register 2 (EMR2)
PDF: 09005aef821ae8bf
1GbDDR2.pdf – Rev. S 10/09 EN
84
Micron Technology, Inc. reserves the right to change products or specifications without notice.
2004 Micron Technology, Inc. All rights reserved.
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