參數(shù)資料
型號(hào)： EM424M822VTB
廠商： Electronic Theatre Controls, Inc.
英文描述： 16Mb ( 2Banks ) Synchronous DRAM
中文描述： 16兆（2Banks）同步DRAM
文件頁數(shù)： 9/18頁
文件大小： 833K
代理商： EM424M822VTB
Rev.01
16Mb SDRAM
9/18
Command
Symbol
CKE
Ignore Command
No operation
Burst stop
Read
Read with auto pre-charge
Write
Write with auto pre-charge
Bank activate
Pre-charge select bank
Pre-charge all banks
Mode register set
DESL
NOP
BSTH
READ
READA
WRIT
WRITA
ACT
PRE
PALL
MRS
Truth Table
1. Command Truth Table
H
H
H
H
H
H
H
H
H
H
H
X
X
X
X
X
X
X
X
X
X
X
n-1
n
/CS
H
L
L
L
L
L
L
L
L
L
L
/RAS
X
H
H
H
H
H
L
L
L
L
L
/CAS
X
H
H
L
L
L
H
H
H
H
L
/WE
X
H
L
H
H
L
H
H
L
L
L
BA
X
X
X
V
V
V
V
V
V
X
L
A10
X
X
X
L
H
L
H
V
L
H
L
A9~A0
X
X
X
V
V
V
V
V
X
X
V
Note :
H = High level, L = Low level, X = High or Low level (Don't care), V = Valid data input
Command
Symbol
CKE
2. DQM Truth Table
n-1
n
/CS
Data w rite / output enable
Data mask / output disable
( EM481M1622VT )
ENB
MASK
H
H
X
X
H
L
Upper byte w rite enable / output enable
Read
Read w ith auto pre-charge
Write
Write w ith auto pre-charge
Bank activate
Pre-charge select bank
Pre-charge all banks
Mode register set
BSTH
READ
READA
WRIT
WRITA
ACT
PRE
PALL
MRS
H
H
H
H
H
H
H
H
H
X
X
X
X
X
X
X
X
X
L
L
L
L
L
L
L
L
L
Note :
H = High level, L = Low level, X = High or Low level (Don't care), V = Valid data input
Command
Symbol
CKE
Activating
Any
Clock suspend
Idle
Idle
3. CKE Truth Table
H
L
L
H
H
L
L
L
L
H
H
L
H
H
n-1
n
/CS
X
X
X
L
L
L
H
/RAS
X
X
X
L
L
H
X
/CAS
X
X
X
L
L
H
X
/WE
X
X
X
H
H
H
X
Addr.
X
X
X
X
X
X
X
REF
SELF
Self refresh
Idle
Power down
H
L
L
H
X
X
X
X
X
X
X
X
X
X
Remark
H = High level, L = Low level, X = High or Low level (Don't care)
Command
Clock suspend mode entry
Clock suspend mode
Clock suspend mode exit
CBR refresh command
Self refresh entry
Self refresh exit
Pow er dow n entry
Pow er dow n exit
( EM481M1622VT )
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