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| 型号： | W3H64M72E-667ESI |
| 厂商： | MICROSEMI CORP-PMG MICROELECTRONICS |
| 元件分类： | DRAM |
| 英文描述： | 64M X 72 DDR DRAM, PBGA208 |
| 封装： | 17 X 23 MM, 1 MM PITCH, PLASTIC, BGA-208 |
| 文件页数： | 6/30页 |
| 文件大小： | 999K |
| 代理商： | W3H64M72E-667ESI |
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W3H64M72E-XSBX
14
White Electronic Designs Corporation (602) 437-1520 www.wedc.com
White Electronic Designs
December 2006
Rev. 2
ADVANCED*
White Electronic Designs Corp. reserves the right to change products or specications without notice.
POSTED CAS ADDITIVE LATENCY (AL)
Posted CAS additive latency (AL) is supported to make
the command and data bus efficient for sustainable
bandwidths in DDR2 SDRAM. Bits E3–E5 dene the value
of AL, as shown in Figure 7. Bits E3–E5 allow the user
to program the DDR2 SDRAM with an inverse AL of 0, 1,
2, 3, or 4 clocks. Reserved states should not be used as
unknown operation or incompatibility with future versions
may result.
In this operation, the DDR2 SDRAM allows a READ or
WRITE command to be issued prior to tRCD (MIN) with
the requirement that AL ≤ tRCD (MIN). A typical application
using this feature would set AL = tRCD (MIN) - 1x tCK. The
READ or WRITE command is held for the time of the AL
before it is issued internally to the DDR2 SDRAM device.
RL is controlled by the sum of AL and CL; RL = AL+CL.
Write latency (WL) is equal to RL minus one clock; WL =
AL + CL - 1 x tCK.
A9
A7 A 6 A5 A4 A3
A8
A2
A1 A0
Exten ded Mo de
Re gister (Ex)
Address Bus
97
6
5
4
3
82
1
0
A10
A12 A11
BA0
BA1
10
11
12
13
01
14
15
A13
0
1
0
1
Mode Register Definition
M15
0
0
1
M14
EMR2
01
01 01
01
High Temperature Self Refresh rate enable
Industrial temperature option;
use if T
C ex cee ds 85° C
E7
0
1
BA2
16
M1 6
0
0
Mode register (MR)
Extended mode register (EMR)
Extended mode register (EMR2)
Extended mode register (EMR3)
Commercial temperature default
FIGURE 8 – EXTENDED MODE REGISTER 2 (EMR2) DEFINITION
Note: 1. E13 (A13)-E0(A0) are reserved for future use and must be programmed to
"0." A13 is not used in this device.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| W3H64M72E-667ESM | 制造商:WEDC 制造商全称:White Electronic Designs Corporation 功能描述:64M x 72 DDR2 SDRAM 208 PBGA Multi-Chip Package |
| W3H64M72E-667SB | 制造商:WEDC 制造商全称:White Electronic Designs Corporation 功能描述:64M x 72 DDR2 SDRAM 208 PBGA Multi-Chip Package |
| W3H64M72E-667SBC | 制造商:Microsemi Corporation 功能描述:64M X 72 DDR2, 1.8V, 667MHZ, 208PBGA COMMERICAL TEMP. - Bulk |
| W3H64M72E-667SBI | 制造商:Microsemi Corporation 功能描述:64M X 72 DDR2, 1.8V, 667MHZ, 208PBGA INDUSTRIAL TEMP. - Bulk |
| W3H64M72E-667SBM | 制造商:Microsemi Corporation 功能描述:64M X 72 DDR2, 1.8V, 667MHZ, 208PBGA MIL-TEMP. - Bulk 制造商:Microsemi Corporation 功能描述:SDRAM MEMORY |
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