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VI SDRAM CONTROLLER BLOCK: SDRAM INTERFACE
B-VI-2-22 EPSON S1C33L03 FUNCTION PART
NameAddressRegister name Bit Function Setting Init. R/W Remarks
SDRTRCD1
SDRTRCD0
SDRTRSC
SDRTRRD1
SDRTRRD0
–
D7–6
D5
D4–3
D2–0
SDRAM t
RCD
spec
SDRAM t
RSC
spec
SDRAM t
RRD
spec
reserved
0
0
0
0
0
–
R/W
R/W
R/W
–
0 when being read.
039FFC5
(B)
SDRAM
timing set-up
register 2
1
1
0
0
1
0
1
0
SDRTRCD[1:0]
Number of clocks
3
2
1
4
1
1
0
0
1
0
1
0
SDRTRRD[1:0]
Number of clocks
3
2
1
4
–
1 1 clock 0 2 clocks
–
SDRARFC11
SDRARFC10
SDRARFC9
SDRARFC8
SDRARFC7
SDRARFC6
SDRARFC5
SDRARFC4
SDRARFC3
SDRARFC2
SDRARFC1
SDRARFC0
DF–C
DB
DA
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
reserved
SDRAM auto refresh count [11:0]
–
1
1
1
1
1
1
1
1
1
1
1
1
–
R/W
0 when being read.039FFC6
(HW)
SDRAM
auto refresh
count register
0 to 4096
–
–
SDRSRFC3
SDRSRFC2
SDRSRFC1
SDRSRFC0
D7–4
D3
D2
D1
D0
reserved
SDRAM self refresh count [3:0]
–
1
1
1
1
–
R/W
0 when being read.
This register must
not be set less than
"0x02".
039FFC8
(B)
SDRAM
self refresh
count register
2 to 15
–
–
––
SDRSZ
SDRBI
–
D7
D6
D5
D4–0
reserved
SDRAM data path bit width
SDRAM bank interleaved access
reserved
–
0
0
–
–
R/W
R/W
–
0 when being read.
0 when being read.
039FFC9
(B)
1 8 bits 0 16 bits
1 Interleaved 0 One bank
SDRAM
advanced
control
register
–
SDRMRS
SDRSRM
–
D7
D6
D5–0
SDRAM mode register set flag
SDRAM current refresh mode
reserved
1
1
–
R
R
–
0 when being read.
039FFCA
(B)
1 Not finished 0 Done
1
Auto refresh
0 Self refresh
SDRAM
status register
Note:Do not access addresses 0x039FFCB to 0x039FFCD, because they are reserved for testing the
SDRAM controller.