HM514170C 데이터 시트보기 (PDF) - Hitachi -> Renesas Electronics
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HM514170C Datasheet PDF : 26 Pages
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HM514170C, HM51S4170C Series
1. Read cycle
2. Early write cycle
3. Delayed write cycle
4. Read-modify-write cycle
5. RAS-only refresh cycle
6. CAS-before-RAS refresh cycle
7. Self refresh cycle (HM51S4170C)
8. Fast page mode read cycle
9. Fast page mode early write cycle
10. Fast page mode delayed write cycle
11. Fast page mode read-modify-write cycle
Inputs
RAS
CAS
UWE
LWE
Output
Operation
H
H
D
D
Open
Standby
H
L
H
H
Valid
Standby
L
L
H
H
Valid
Read cycle
L
L
L*2
L*2
Open
Early write cycle
L
L
L*2
L*2
Undefined
Delayed write cycle
L
L
H to L
H to L
Valid
Read-modify-write cycle
L
H
D
D
Open
RAS-only refresh cycle
H to L
L
D
D
Open
CAS-before-RAS refresh cycle
Self refresh cycle (HM51S4170C)
L
H to L
H
H
Valid
Fast page mode read cycle
L
H to L
L*2
L*2
Open
Fast page mode early write cycle
L
H to L
L*2
L*2
Undefined
Fast page mode delayed write cycle
L
H to L
H to L
H to L
Valid
Fast page mode read modify-write cycle
Notes: 1. H: High (inactive) L: Low (active) D: H or L
2. tWCS ≥ 0 ns Early write cycle
tWCS < 0 ns Delay write cycle
3. Mode is determined by the OR function of the UWE and LWE. (Mode is set by the earliest of
UWE and LWE active edge and reset by the latest of UWE and LWE inactive edge.) However
write OPERATION and output HIZ control are done independently by each UWE, LWE.
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