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)： 21/94頁(yè)
文件大?。?/td> 1180K
代理商： ΜPD481850
Preliminary Data Sheet
21
μ
PD481850 for Rev.L
(7/7)
Current state
/CS /RAS /CAS /WE DSF
Address
Command
Action
Notes
Special mode
H
x
x
x
x
x
DESL
Nop
→
Enter previous state after t
RSC
register
L
H
H
H
x
x
NOP
Nop
→
Enter previous state after t
RSC
accessing
L
H
H
L
H
x
Undefined
ILLEGAL
L
H
H
L
L
x
BST
ILLEGAL
L
H
L
H
H
x
Undefined
ILLEGAL
L
H
L
H
L
BA, CA, A8
READ/READA
ILLEGAL
L
H
L
L
H
BA, CA, A8
BW/BWA
ILLEGAL
L
H
L
L
L
BA, CA, A8
WRIT/WRITA
ILLEGAL
L
L
H
H
H
BA, RA
ACTWPB
ILLEGAL
L
L
H
H
L
BA, RA
ACT
ILLEGAL
L
L
H
L
H
x
Undefined
ILLEGAL
L
L
H
L
L
BA, A8
PRE/PALL
ILLEGAL
L
L
L
H
H
x
Undefined
ILLEGAL
L
L
L
H
L
x
REF/SELF
ILLEGAL
L
L
L
L
H
Op-Code
SRS
ILLEGAL
L
L
L
L
L
Op-Code
MRS
ILLEGAL
Notes 1.
All entries assume that CKE was active (High level) during the preceding clock cycle.
2.
If both banks are idle, and CKE is inactive (Low level),
μ
PD481850 will enter Power down mode.
All input buffers except CKE will be disabled.
3.
Illegal to bank in specified states; Function may be legal in the bank indicated by Bank Address (BA),
depending on the state of that bank.
4.
If both banks are idle, and CKE is inactive (Low level),
μ
PD481850 will enter Self refresh. All input
buffers except CKE will be disabled.
5.
Illegal if t
RCD
is not satisfied.
6.
Illegal if t
RAS
is not satisfied.
7.
Must satisfy burst interrupt condition.
8.
Must satisfy bus contention, bus turn around, and/or write recovery requirements.
9.
Must mask preceding data which don't satisfy t
DPL
.
10.
Illegal if t
RRD
is not satisfied.
11.
Nop to bank precharging or in idle state. May precharge bank(s) indicated by BA (and A8).
12.
Illegal if any bank is not idle.
Remark
H = High level, L = Low level, x = High or Low level (Don’t care), V = Valid Data input, BA = Bank address
(A9), A8 = Precharge select, RA = Row address, CA = Column address, Term = Terminate, AP = Auto
precharge, NOP = No operation, ILLEGAL = Device operation and/or data-integrity are not guaranteed
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