參數(shù)資料
型號(hào)： μPD481850
廠商： NEC Corp.
英文描述： Synchronous Graphics Memory (SGRAM)(8M 同步圖形存儲(chǔ)器)
中文描述： 同步圖形存儲(chǔ)器（SGRAM）（8分同步圖形存儲(chǔ)器）
文件頁(yè)數(shù)： 22/94頁(yè)
文件大小： 1180K
代理商： ΜPD481850
Preliminary Data Sheet
22
μ
PD481850 for Rev.L
4.5 Command Truth Table for CKE
Current state
CKE
/CS /RAS /CAS /WE DSF
Address
Action
Notes
n
–1
n
Self refresh
H
x
x
x
x
x
x
x
INVALID, CLK(n
–1
) would exit S.R.
(S.R.)
L
H
H
x
x
x
x
x
S.R. Recovery
L
H
L
H
H
x
x
x
S.R. Recovery
L
H
L
H
L
x
x
x
ILLEGAL
L
H
L
L
x
x
x
x
ILLEGAL
L
L
x
x
x
x
x
x
Maintain S.R.
Self refresh
H
H
H
x
x
x
x
x
Idle after t
RC
recovery
H
H
L
H
H
x
x
x
Idle after t
RC
H
H
L
H
L
x
x
x
ILLEGAL
H
H
L
L
x
x
x
x
ILLEGAL
H
L
H
x
x
x
x
x
ILLEGAL
H
L
L
H
H
x
x
x
ILLEGAL
H
L
L
H
L
x
x
x
ILLEGAL
H
L
L
L
x
x
x
x
ILLEGAL
Power down
H
x
x
x
x
x
x
x
INVALID, CLK(n
–1
) would exit P.D.
(P.D.)
L
H
x
x
x
x
x
x
EXIT P.D.
→
Idle
L
L
x
x
x
x
x
x
Maintain power down mode
Both banks
H
H
H
x
x
x
x
x
Refer to operations in Operative Command Table
idle
H
H
L
H
x
x
x
x
Refer to operations in Operative Command Table
H
H
L
L
H
x
x
x
Refer to operations in Operative Command Table
H
H
L
L
L
H
L
x
Refresh
H
H
L
L
L
L
x
Op-Code
Refer to operations in Operative Command Table
H
L
H
x
x
x
x
x
Refer to operations in Operative Command Table
H
L
L
H
x
x
x
x
Refer to operations in Operative Command Table
H
L
L
L
H
x
x
x
Refer to operations in Operative Command Table
H
L
L
L
L
H
L
x
Self refresh
1
H
L
L
L
L
L
x
Op-Code
Refer to operations in Operative Command Table
L
x
x
x
x
x
x
x
Power down
1
Row active
H
x
x
x
x
x
x
x
Refer to operations in Operative Command Table
L
x
x
x
x
x
x
x
Power down
2
Any state other
H
H
x
x
x
x
x
x
Refer to operations in Operative Command Table
than listed
H
L
x
x
x
x
x
x
Begin clock suspend next cycle
2
above
L
H
x
x
x
x
x
x
Exit clock suspend next cycle
L
L
x
x
x
x
x
x
Maintain clock suspend
Notes 1.
Self refresh can be entered only from the both banks idle state. Power down can be entered from the
both banks idle state or row active state.
2.
Must be legal command as defined in Operative Command Table.
Remark
H = High level, L = Low level, x = High or Low level (Don’t care)
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