81C4256A-10 Просмотр технического описания (PDF) - Fujitsu
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81C4256A-10 Datasheet PDF : 29 Pages
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MB81C4256A-60
MB81C4256A-70
MB81C4256A-80
MB81C4256A-10
Not Recommended for New Design
FUNCTIONAL TRUTH TABLE
Clock Input
Operation Mode
RAS CAS WE
OE
Standby
H
H
X
X
Read Cycle
L
L
H
L
Write Cycle
(Early Write)
L
L
L
X
Read-Modify-
Write Cycle
L
L
H→L L→H
RAS-onIy
Refresh Cycle
L
H
X
X
CAS-before RAS
Refresh Cycle
L
L
X
X
Hidden Refresh
Cycle
H→L
L
X
L
Address Input
Row Column
Data
Refresh
Input Output
Note
—
Valid
—
Valid
—
High-Z
—
—
Valid
Yes * tRCS ≥ tRCS (min)
Valid
Valid
Valid High-Z Yes * tWCS ≥ tWCS (min)
Valid
Valid
Valid
Valid
Yes *
Valid
—
—
High-Z Yes
—
—
—
High-Z
Yes tCSR ≥ tWCSR (min)
—
—
—
Valid
Yes
Previous data is
kept
Notes: X : “H”or”L”
* : It is impossible in Fast Page Mode.
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