MT47H64M8CF-25E IT:G Micron Technology Inc, MT47H64M8CF-25E IT:G Datasheet - Page 81

• Manufacturer Part Number: MT47H64M8CF-25E IT:G
• Description: 64MX8 DDR2 SDRAM PLASTIC IND TEMP FBGA 1.8V
• Manufacturer: Micron Technology Inc

Extended Mode Register 2 (EMR2)
Figure 38: EMR2 Definition
PDF: 09005aef8440dbbc
512mbddr2_ait_aat.pdf – Rev. C 7/11 EN
Notes:
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 38. The EMR2 is pro-
grammed via the LM command and will retain the stored information until it is pro-
grammed 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 de-
vices if T
EMR2 must be loaded when all banks are idle and no bursts are in progress, and the
controller must wait the specified time
tion. Violating either of these requirements could result in an unspecified operation.
E15
0
0
1
1
1. E16 (BA2) is only applicable for densities 1Gb, reserved for future use, and must be pro-
2. Mode bits (En) with corresponding address balls (An) greater than E12 (A12) are re-
BA2
E14
16
0
0
1
0
1
grammed to “0.”
served for future use and must be programmed to “0.”
1
Extended mode register (EMR2)
Extended mode register (EMR3)
BA1
Extended mode register (EMR)
15
MRS
C
BA0
14
Mode register (MR)
Mode Register Set
exceeds 85°C.
0
Micron Confidential and Proprietary
An
n
2
12
0
A12 A11
0
11
0
10
A10
0
9
A9
0 SRT 0
8
A8
E7
0
1
7
A7 A6 A5 A4 A3
1X refresh rate (0°C to 85°C)
81
6
512Mb: x8, x16 Automotive DDR2 SDRAM
2X refresh rate (>85°C)
0
5
SRT Enable
0
4
0
3
0
t
Micron Technology, Inc. reserves the right to change products or specifications without notice.
2
MRD before initiating any subsequent opera-
A2 A1 A0
Extended Mode Register 2 (EMR2)
0
1
0
0
Extended mode
register (Ex)
Address bus
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