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| 型号： | MT48V4M32LFFC |
| 厂商： | Micron Technology, Inc. |
| 英文描述： | SYNCHRONOUS DRAM |
| 中文描述： | 同步DRAM |
| 文件页数： | 12/61页 |
| 文件大小： | 1400K |
| 代理商： | MT48V4M32LFFC |
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12
128Mb: x16, x32 Mobile SDRAM
MobileY95W_3V_F.p65 – Rev. F; Pub. 9/02
Micron Technology, Inc., reserves the right to change products or specifications without notice.
2002, Micron Technology, Inc.
128Mb: x16, x32
MOBILE SDRAM
ADVANCE
EXTENDED MODE REGISTER
The Extended Mode Register controls the functions
beyond those controlled by the Mode Register. These
additional functions are special features of the Mobile
device. They include Temperature Compensated Self Re-
fresh (TCSR) Control, and Partial Array Self Refresh
(PASR).
The Extended Mode Register is programmed via the
Mode Register Set command (BA1=1,BA0=0) and retains
the stored information until it is programmed again or
the device loses power.
The Extended Mode Register must be programmed
with M5 through M11 set to “0”. The Extended Mode
Register must be loaded when all banks are idle and no
bursts are in progress, and the controller must wait the
specified time before before initiating any subsequent
operation. Violating either of these requirements results
in unspecified operation.
TEMPERATURE COMPENSATED SELF REFRESH
Temperature Compensated Self Refresh (TCSR) al-
lows the controller to program the Refresh interval dur-
ing SELF REFRESH mode, according to the case tempera-
ture of the Mobile device. This allows great power savings
during SELF REFRESH during most operating tempera-
ture ranges. Only during extreme temperatures would
the controller have to select a TCSR level that will guaran-
tee data during SELF REFRESH.
Every cell in the DRAM requires refreshing due to the
capacitor losing its charge over time. The refresh rate is
dependent on temperature. At higher temperatures a
capacitor loses charge quicker than at lower tempera-
tures, requiring the cells to be refreshed more often.
Historically, during Self Refresh, the refresh rate has
been set to accomodate the worst case, or highest tem-
perature range expected.
EXTENDED MODE REGISTER TABLE
Maximum Case Temp
85C
70C
A4 A3
1
0
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
A11
10
11
12
PASR
TCSR
0
13
1
All must be set to "0"
BA0
M9
M7 M6 M5 M4 M3
M8
M2 M1 M0
M10
M11
M12
BA1
M13
1
0
45C
15C
0
1
1
0
Notes:
1. E13 and E12 (BA1 and BA0) must be “1, 0” to select the
Extended Mode Register (vs. the base Mode Register).
2. RFU: Reserved for Future Use
Self Refresh Coverage
Four Banks
Two Banks (Bank 0,1)
One Bank (Bank 0)
RFU
RFU
RFU
RFU
RFU
A2
A1
A0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
1
1
1
1
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