9 SRAM CONTROLLER (SRAMC)
S1C33L26 TECHNICAL MANUAL
Seiko Epson Corporation
9-11
Register name Address
Bit
Name
Function
Setting
Init. R/W
Remarks
#CE[7:4]
Access Timing
Configuration
Register
(SRAMC_
TMG47)
0x302220
(32 bits)
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
See the descriptions of the SRAMC_TMG810 register.
#CE[10:8]Access Timing Configuration Register (SRAMC_TMG810)
Register name Address
Bit
Name
Function
Setting
Init. R/W
Remarks
#CE[10:8]
Access Timing
Configuration
Register
(SRAMC_
TMG810)
0x302224
(32 bits)
D31–24 –
reserved
–
–
–
1 when being read.
D23–22 CE10SETUP
[1:0]
#CE10 setup cycle
CE10SETUP[1:0] Setup cycle
0x3 R/W
0x3
0x2
0x1
0x0
4 cycles
3 cycles
2 cycles
1 cycle
D21–20 CE10HOLD
[1:0]
#CE10 hold cycle
CE10HOLD[1:0]
Hold cycle
0x3 R/W
0x3
0x2
0x1
0x0
4 cycles
3 cycles
2 cycles
1 cycle
D19–16 CE10WAIT
[3:0]
#CE10 static wait cycle
CE10WAIT[3:0]
Wait cycle
0xf R/W
0xf
0xe
:
0x1
0x0
15 cycles
14 cycles
:
1 cycle
0 cycles
D15–14 CE9SETUP
[1:0]
#CE9 setup cycle
CE9SETUP[1:0] Setup cycle
0x3 R/W
0x3
:
0x0
4 cycles
:
1 cycle
D13–12 CE9HOLD
[1:0]
#CE9 hold cycle
CE9HOLD[1:0]
Hold cycle
0x3 R/W
0x3
:
0x0
4 cycles
:
1 cycle
D11–8 CE9WAIT
[3:0]
#CE9 static wait cycle
CE9WAIT[3:0]
Wait cycle
0xf R/W
0xf
:
0x0
15 cycles
:
0 cycles
D7–6 CE8SETUP
[1:0]
#CE8 setup cycle
CE8SETUP[1:0] Setup cycle
0x3 R/W
0x3
:
0x0
4 cycles
:
1 cycle
D5–4 CE8HOLD
[1:0]
#CE8 hold cycle
CE8HOLD[1:0]
Hold cycle
0x3 R/W
0x3
:
0x0
4 cycles
:
1 cycle
D3–0 CE8WAIT
[3:0]
#CE8 static wait cycle
CE8WAIT[3:0]
Wait cycle
0xf R/W
0xf
:
0x0
15 cycles
:
0 cycles
The SRAMC_TMG47 and the SRAMC_TMG810 registers are used to set the SRAM access timing for each #CE
area.
Letter ‘
x
’ in the control bit and #CE names denotes a #CE area number (4, 5, or 7 to 10).
D[31:30], D[23:22], D[15:14], D[7:6]
CE
x
SETUP[1:0]: #CE
x
Setup Cycle Bits
Configures the #CE
x
signal setup time (#CE
x
falling edge to read/write signal falling edge).
7.2 #CE Setup Time Settings
Table 9.
CE
x
SETUP[1:0]
Setup time
0x3
4 cycles
0x2
3 cycles
0x1
2 cycles
0x0
1 cycle
(Default: 0x3)