參數(shù)資料
型號(hào)： EDD2508AKTA-5-E
廠商： Elpida Memory, Inc.
英文描述： 256M bits DDR SDRAM (32M words x 8 bits, DDR400)
中文描述： 256M比特DDR SDRAM內(nèi)存（32M的字× 8位，支持DDR400）
文件頁(yè)數(shù)： 13/48頁(yè)
文件大?。?/td> 551K
代理商： EDD2508AKTA-5-E
EDD2508AKTA-5-E
Preliminary Data Sheet E0609E20 (Ver. 2.0)
13
Command Operation
Command Truth Table
DDR SDRAM recognize the following commands specified by the /CS, /RAS, /CAS, /WE and address pins. All other
combinations than those in the table below are illegal.
CKE
Command
Symbol
n – 1 n
/CS
/RAS /CAS /WE BA1 BA0 AP
Address
Ignore command
DESL
H
H
H
×
×
×
×
×
×
×
No operation
NOP
H
H
L
H
H
H
×
×
×
×
Burst stop in read command
BST
H
H
L
H
H
L
×
×
×
×
Column address and read command
READ
H
H
L
H
L
H
V
V
L
V
Read with auto-precharge
READA
H
H
L
H
L
H
V
V
H
V
Column address and write command
WRIT
H
H
L
H
L
L
V
V
L
V
Write with auto-precharge
WRITA
H
H
L
H
L
L
V
V
H
V
Row address strobe and bank active
ACT
H
H
L
L
H
H
V
V
V
V
Precharge select bank
PRE
H
H
L
L
H
L
V
V
L
×
Precharge all bank
PALL
H
H
L
L
H
L
×
×
H
×
Refresh
REF
H
H
L
L
L
H
×
×
×
×
SELF
H
L
L
L
L
H
×
×
×
×
Mode register set
MRS
H
H
L
L
L
L
L
L
L
V
Remark: H: VIH. L: VIL.
×
: VIH or VIL V: Valid address input
Note: The CKE level must be kept for 1 CK cycle at least.
Ignore command [DESL]
When /CS is High at the cross point of the CK rising edge and the VREF level, every input are neglected and internal
status is held.
No operation [NOP]
As long as this command is input at the cross point of the CK rising edge and the VREF level, address and data
input are neglected and internal status is held.
Burst stop in read operation [BST]
This command stops a burst read operation, which is not applicable for a burst write operation.
Column address strobe and read command [READ]
This command starts a read operation. The start address of the burst read is determined by the column address
(See “Address Pins Table” in Pin Function) and the bank select address. After the completion of the read operation,
the output buffer becomes High-Z.
Read with auto-precharge [READA]
This command starts a read operation. After completion of the read operation, precharge is automatically executed.
Column address strobe and write command [WRIT]
This command starts a write operation. The start address of the burst write is determined by the column address
(See “Address Pins Table” in Pin Function) and the bank select address.
Write with auto-precharge [WRITA]
This command starts a write operation. After completion of the write operation, precharge is automatically executed.
EMRS
H
H
L
L
L
L
L
H
L
V
相關(guān)PDF資料
PDF描述
EDD2508AKTA-5B-E 256M bits DDR SDRAM (32M words x 8 bits, DDR400)
EDD2508AKTA-5C-E 256M bits DDR SDRAM (32M words x 8 bits, DDR400)
EDD2508AKTA-5 256M bits DDR SDRAM (32M words x 8 bits, DDR400)
EDD2508AKTA-5B 256M bits DDR SDRAM (32M words x 8 bits, DDR400)
EDD2508AKTA-5C 256M bits DDR SDRAM (32M words x 8 bits, DDR400)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
EDD2508AKTA-6B 制造商:ELPIDA 制造商全稱:Elpida Memory 功能描述:256M bits DDR SDRAM
EDD2508AKTA-6B-E 制造商:ELPIDA 制造商全稱:Elpida Memory 功能描述:256M bits DDR SDRAM
EDD2508AKTA-6BLI 制造商:ELPIDA 制造商全稱:Elpida Memory 功能描述:256M bits DDR SDRAM WTR (Wide Temperature Range)
EDD2508AKTA-E 制造商:ELPIDA 制造商全稱:Elpida Memory 功能描述:256M bits DDR SDRAM
EDD2508AKTA-LI 制造商:ELPIDA 制造商全稱:Elpida Memory 功能描述:256M bits DDR SDRAM WTR (Wide Temperature Range)
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