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| 型號： | MT47H128M8HQ-187ELAT: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, ROHS COMPLIANT, FBGA-60 |
| 文件頁數(shù)： | 108/133頁 |
| 文件大?。?/td> | 9170K |
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Burst Length
Burst length is defined by bits M0–M2, as shown in Figure 35. Read and write accesses
to the DDR2 SDRAM are burst-oriented, with the burst length being programmable to
either four or eight. The burst length determines the maximum number of column loca-
tions that can be accessed for a given READ or WRITE command.
When a READ or WRITE command is issued, a block of columns equal to the burst
length is effectively selected. All accesses for that burst take place within this block,
meaning that the burst will wrap within the block if a boundary is reached. The block is
uniquely selected by A2–Ai when BL = 4 and by A3–Ai when BL = 8 (where Ai is the most
significant column address bit for a given configuration). The remaining (least signifi-
cant) address bit(s) is (are) used to select the starting location within the block. The
programmed burst length applies to both read and write bursts.
Figure 35: MR Definition
Burst Length
CAS#
BT
PD
A9
A7 A6 A5 A4 A3
A8
A2 A1 A0
Mode Register (Mx)
Address Bus
9
7
6
5
4
3
8
2
1
0
A10
A12 A11
BA0
BA1
10
11
12
n
0
14
Burst Length
Reserved
4
8
Reserved
M0
0
1
0
1
0
1
0
1
M1
0
1
0
1
M2
0
1
0
1
Burst Type
Sequential
Interleaved
M3
CAS Latency (CL)
Reserved
3
4
5
6
7
M4
0
1
0
1
0
1
0
1
M5
0
1
0
1
M6
0
1
0
1
Mode
Normal
Test
M7
15
DLL TM
0
1
DLL Reset
No
Yes
M8
Write Recovery
Reserved
2
3
4
5
6
7
8
M9
0
1
0
1
0
1
0
1
M10
0
1
0
1
M11
0
1
WR
An2
MR
M14
0
1
0
1
Mode Register Definition
Mode register (MR)
Extended mode register (EMR)
Extended mode register (EMR2)
Extended mode register (EMR3)
M15
0
1
M12
0
1
PD Mode
Fast exit
(normal)
Slow exit
(low power)
Latency
16
BA21
Notes: 1. M16 (BA2) is only applicable for densities
≥1Gb, reserved for future use, and must be
programmed to “0.”
2. Mode bits (Mn) with corresponding address balls (An) greater than M12 (A12) are re-
served for future use and must be programmed to “0.”
3. Not all listed WR and CL options are supported in any individual speed grade.
1Gb: x4, x8, x16 DDR2 SDRAM
Mode Register (MR)
PDF: 09005aef821ae8bf
1GbDDR2.pdf – Rev. S 10/09 EN
76
Micron Technology, Inc. reserves the right to change products or specifications without notice.
2004 Micron Technology, Inc. All rights reserved.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MT47H128M8HQ-25AT | 制造商:MICRON 制造商全稱:Micron Technology 功能描述:DDR2 SDRAM |
| MT47H128M8HQ-25EAT | 制造商:MICRON 制造商全稱:Micron Technology 功能描述:DDR2 SDRAM |
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