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HM514170DTT-7 Datasheet(PDF) 7 Page - Hitachi Semiconductor

Part # HM514170DTT-7
Description  262,144-word x 16-bit Dynamic RAM
Download  33 Pages
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Manufacturer  HITACHI [Hitachi Semiconductor]
Direct Link  http://www.renesas.com/eng
Logo HITACHI - Hitachi Semiconductor

HM514170DTT-7 Datasheet(HTML) 7 Page - Hitachi Semiconductor

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HM51(S)4170D Series, HM51(S)4270D Series
7
Operation Mode
The HM51(S)4170D, HM51(S)4270D series has the following 11 operation modes.
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 (HM51S4170D, HM51S4270D)
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
LL
L*
2
L*
2
Open
Early write cycle
LL
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
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. t
WCS ≥ 0 ns
Early write cycle
t
WCS < 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 High-Z control are done independently by each
UWE, LWE.


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