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參數(shù)資料
| 型號(hào)： | EM421M3284LBA-7FE |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 512Mb (4M】4Bank】32) Double DATA RATE SDRAM |
| 中文描述： | 的512Mb（4分】4Bank】32）的雙倍數(shù)據(jù)速率SDRAM |
| 文件頁(yè)數(shù)： | 15/20頁(yè) |
| 文件大小： | 343K |
| 代理商： | EM421M3284LBA-7FE |
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eorex
EM42AM3284LBA
Mode Register Definition
Mode Register Set
The mode register stores the data for controlling the various operating modes of DDR SDRAM which
contains addressing mode, burst length, /CAS latency, test mode, DLL reset and various vendor
＇
s specific
opinions. The defaults values of the register is not defined, so the mode register must be written after EMRS
setting for proper DDR SDRAM operation. The mode register is written by asserting low on /CS, /RAS, /CAS,
/WE and BA0 ( The DDR SDRAM should be in all bank precharge with CKE already high prior to writing into
the mode register. ) The state of the address pins A0-A12 in the same cycle as /CS, /RAS, /CAS, /WE and
BA0 going low is written in the mode register. Two clock cycles are requested to complete the write operation
in the mode register. The mode register contents can be changed using the same command and clock cycle
requirements during operating as long as all banks are in the idle state. The mode register is divided into
various fields depending on functionality. The burst length uses A0-A2, addressing mode uses A3, /CAS
latency ( read latency from column address ) uses A4-A6. A7 is used for test mode. A8 is used for DDR reset.
A7 must be set to low for normal MRS operation.
Jul. 2006
www.eorex.com
15/20
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| EM421M3284LBA-8FE | 512Mb (4M】4Bank】32) Double DATA RATE SDRAM |
| EM422M3284LBA-75FE | 512Mb (4M】4Bank】32) Double DATA RATE SDRAM |
| EM422M3284LBA-7FE | 512Mb (4M】4Bank】32) Double DATA RATE SDRAM |
| EM422M3284LBA-8FE | 512Mb (4M】4Bank】32) Double DATA RATE SDRAM |
| EM423M3284LBA-75FE | 512Mb (4M】4Bank】32) Double DATA RATE SDRAM |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| EM421M3284LBA-8FE | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:512Mb (4M×4Bank×32) Double DATA RATE SDRAM |
| EM421M812VTA | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:16Mb ( 2Banks ) Synchronous DRAM |
| EM421M812VTB | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:16Mb ( 2Banks ) Synchronous DRAM |
| EM421M814VTA | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:16Mb ( 2Banks ) Synchronous DRAM |
| EM421M814VTB | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:16Mb ( 2Banks ) Synchronous DRAM |
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