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SM5902AF Datasheet(PDF) 9 Page - Nippon Precision Circuits Inc

Part # SM5902AF
Description  compression and non compression type shock-proof memory controller
PDF  40 Pages
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Manufacturer  NPC [Nippon Precision Circuits Inc]
Direct Link  http://www.npc.co.jp/en
Logo NPC - Nippon Precision Circuits Inc

SM5902AF Datasheet(HTML) 9 Page - Nippon Precision Circuits Inc

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DRAM access timing (with single DRAM)
The NWE terminal output is fixed HIGH during read timing.
DRAM access timing (with 2 DRAMs)
The NWE terminal output is fixed HIGH during read timing.
NCAS terminal output is fixed HIGH when selecting "DRAM2".
NCAS2 terminal output is fixed HIGH when selecting "DRAM1".
NIPPON PRECISION CIRCUITS-9
SM5902AF
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NCAS
A0 to A10
D0 to D3
(WRITE)
NRAS
D0 to D3
(READ)
NWE
(WRITE)
3
WCS
t
6
WEL
t
CRDH
t
CRDS
t
CWDH
t
CWDS
t
33
5
CADH
t
CADS
t
RADH
t
RADS
t
11
1
5
3
2
tRCD
tCASL
CASH
t
RASH
t
3
tCY
5
RASL
t
tCY
tCY
tCY
tCY
tCY
tCY
tCY
tCY
tCY
tCY
tCY
tCY
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NCAS
(DRAM1 SELECT)
A0 to A9
NRAS
D0 to D3
(READ)
NCAS2
(DRAM2 SELECT)
,,,,,,,,,,,,,,
,,,,,,,,,,,,,,
,,,,,,,,,,,,,,
,,,,,,,,,,,,,,
,,,,,,,,,,,,,,
D0 to D3
(WRITE)
NWE
(WRITE)
5
3
25
3
1
1
1
3
3
5
25
3
3
RASH
t
RASL
t
RCD
ttCASL
CASH
t
CASH
t
tCASL
RDC
t
tRADS
RADH
t
CADS
t
CADH
t
CWDH
t
CWDS
t
CRDS
t
CRDH
t
WCS
t
tCY
tCY
tCY
tCY
tCY
tCY
tCY
tCY
tCY
tCY
tCY
tCY
tCY
tCY
tCY
WEL
t
6
tCY
WCS
t



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