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512Mb: 32 Meg x 16, 16 Meg x 32 Mobile SDRAM
Extended Mode Register
Extended Mode Register
The extended mode register (EMR) controls additional functions beyond those control-
led by the mode register. These additional functions include TCSR, PASR, and output
drive strength.
The EMR is programmed via the LMR command (BA1 = 1, BA0 = 0) and retains the stor-
ed information until it is programmed again or the device loses power.
The EMR must be programmed with E[ n:7] set to 0. It must be loaded when all banks
are idle and no bursts are in progress, and the controller must wait the specified time
before initiating any subsequent operation. Violating either of these requirements re-
sults in unspecified operation. After the values are entered, the EMR settings are re-
tained even after exiting deep power-down mode.
Figure 15: Extended Mode Register Definition
BA1 BA0 A n
... A10 A9 A8 A7 A6 A5 A4 A3 A2 A1
A0
Address bus
n + 2 n + 1 n
1 0
... 10 9
Operation
8
7
6
DS
5
4 3
TCSR 1
2
1
PASR
0
Extended mode
register (Ex)
En + 2 En + 1
Mode Register Definition
E7
E6
E5
Drive Strength
0
0
1
1
0
1
0
1
Standard mode register
Status register
Extended mode register
Reserved
0
0
0
0
0
0
1
1
0
1
0
1
Full strength
1/2 strength
1/4 strength
3/4 strength
1
1
1
1
0
0
1
1
0
1
0
1
3/4 strength
Reserved
Reserved
Reserved
En
...
E10 E9
E8
E7–E0
E2
E1
E0
Partial-Array Self Refresh Coverage
0
–
0
–
0
–
0
–
0
–
Valid
–
Normal AR operation
All other states reserved
0
0
0
0
0
1
Full array
1/2 array
0
0
1
1
1
1
1
1
0
0
1
1
0
1
0
1
0
1
1/4 array
Reserved
Reserved
1/8 array
1/16 array
Reserved
Note:
1. On-die temperature sensor is used in place of TCSR. Setting these bits will have no ef-
fect.
Temperature-Compensated Self Refresh
This device includes a temperature sensor that is implemented for automatic control of
the self refresh oscillator. Programming the temperature-compensated self refresh
PDF: 09005aef8459c827
512mb_mobile_sdram_y67m_at.pdf – Rev. B 3/11 EN
44
Micron Technology, Inc. reserves the right to change products or specifications without notice.
? 2011 Micron Technology, Inc. All rights reserved.
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