APPENDIX A LIST OF I/O REGISTERS
AP-A-56
Seiko Epson Corporation
S1C33L26 TECHNICAL MANUAL
Register name Address
Bit
Name
Function
Setting
Init. R/W
Remarks
SDRAM
Refresh Control
Register
(SDRAMC_REF)
0x302208
(32 bits)
D31–26 –
reserved
–
–
–
0 when being read.
D25
SREFDO
SDRAM self-refresh status
1 Finished
0 Busy
0
R
D24
SCKON
SDRAM clock during self-refresh
1 Enable
0 Disable
0
R/W
D23
SELEN
SDRAM self-refresh enable
1 Enable
0 Disable
0
R/W
D22–16 SELCO[6:0] SDRAM self-refresh counter
0x0 to 0x7f
0x7f R/W
D15–12 –
reserved
–
–
–
0 when being read.
D11–0 AURCO[11:0] SDRAM auto-refresh counter
0x0 to 0xfff
0x8c R/W
SDRAM
Application
Configuration
Register
(SDRAMC_APP)
0x302210
(32 bits)
D31–6 –
reserved
–
–
–
0 when being read.
D5
DBF
Double frequency mode enable
1 Enable
0 Disable
0
W
D4
–
reserved
–
–
–
D3–2 CAS[1:0]
CAS latency setup
CAS[1:0]
CAS latency
0x2 R/W
0x3
0x2
0x1
0x0
3
2
1
reserved
D1
–
reserved
–
–
–
0 when being read.
D0
–
reserved
–
0
R/W Do not set to 1.
0x302220–0x302228
SRAM Controller (SRAMC)
Register name Address
Bit
Name
Function
Setting
Init. R/W
Remarks
#CE[7:4]
Access Timing
Configuration
Register
(SRAMC_
TMG47)
0x302220
(32 bits)
D31–30 CE7SETUP
[1:0]
#CE7 setup cycle
CE7SETUP[1:0] Setup cycle
0x3 R/W
0x3
0x2
0x1
0x0
4 cycles
3 cycles
2 cycles
1 cycle
D29–28 CE7HOLD
[1:0]
#CE7 hold cycle
CE7HOLD[1:0]
Hold cycle
0x3 R/W
0x3
0x2
0x1
0x0
4 cycles
3 cycles
2 cycles
1 cycle
D27–24 CE7WAIT
[3:0]
#CE7 static wait cycle
CE7WAIT[3:0]
Wait cycle
0xf R/W
0xf
0xe
:
0x1
0x0
15 cycles
14 cycles
:
1 cycle
0 cycles
D23–16 –
reserved
–
–
–
1 when being read.
D15–14 CE5SETUP
[1:0]
#CE5 setup cycle
CE5SETUP[1:0] Setup cycle
0x3 R/W
0x3
:
0x0
4 cycles
:
1 cycle
D13–12 CE5HOLD
[1:0]
#CE5 hold cycle
CE5HOLD[1:0]
Hold cycle
0x3 R/W
0x3
:
0x0
4 cycles
:
1 cycle
D11–8 CE5WAIT
[3:0]
#CE5 static wait cycle
CE5WAIT[3:0]
Wait cycle
0xf R/W
0xf
:
0x0
15 cycles
:
0 cycles
D7–6 CE4SETUP
[1:0]
#CE4 setup cycle
CE4SETUP[1:0] Setup cycle
0x3 R/W
0x3
:
0x0
4 cycles
:
1 cycle
D5–4 CE4HOLD
[1:0]
#CE4 hold cycle
CE4HOLD[1:0]
Hold cycle
0x3 R/W
0x3
:
0x0
4 cycles
:
1 cycle
D3–0 CE4WAIT
[3:0]
#CE4 static wait cycle
CE4WAIT[3:0]
Wait cycle
0xf R/W
0xf
:
0x0
15 cycles
:
0 cycles