SM5902AF Nippon Precision Circuits Inc, SM5902AF Datasheet - Page 9

• Manufacturer Part Number: SM5902AF
• Description: compression and non compression type shock-proof memory controller
• Manufacturer: Nippon Precision Circuits Inc

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