14 MEMORY INTERFACE CONTROLLER
114
EPSON
S1C38000 TECHNICAL MANUAL
bits 22–16 Device 3 Memory Segment End Bits [6:0]
These bits specify device 3 end address in 1M byte units.
These bits default to 7Fh.
bits 14–8
Device 3 Memory Segment Start Bits [6:0]
These bits specify device 3 start address in 1M byte units.
These bits default to 7Fh.
bit 7
Device 3 Disable
This bit defaults to 1.
0
Enable device 3 read/write access.
1
Disable device 3 read/write access.
bit 6
reserved
This bit is reserved and must be set to 0.
bits 5–4
Device 3 Memory Write Start Bits [1:0]
Device 3 memory write pulse asserted = (MEM[10h] bits [5:4] + 1/2) MCLK. The write
pulse is de-asserted at (MEM[10h] bits [2:0] + 1/2) MCLK.
bits 2–0
Device 3 Memory Cycle Bits [2:0]
Device 3 memory access cycle = (MEM[10h] bits [2:0] + 1) MCLK. The minimum
value for these bits is 001. The value 000 is an invalid setting for these bits.
bits 22–16 Device 4 Memory Segment End Bits [6:0]
These bits specify device 4 end address in 1M byte units.
These bits default to 7Fh.
bits 14–8
Device 4 Memory Segment Start Bits [6:0]
These bits specify device 4 start address in 1M byte units.
These bits default to 7Fh.
bit 7
Device 4 Disable
This bit defaults to 1.
0
Enable device 4 read/write access.
1
Disable device 4 read/write access.
bit 6
reserved
This bit is reserved and must be set to 0.
bits 1–0
Device 4 SDRAM Column Select Bits [1:0]
00
Select A0–A7 for SDRAM column addresses.
01
Select A0–A8 for SDRAM column addresses.
10
Select A0–A9 for SDRAM column addresses.
11
Select A0–A9, A11 for SDRAM column addresses.
Device 3 Configuration Register
MEM[10h]
Default = 007F 7F87h
Read/Write
n/a
Device 3 Memory Segment End
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
n/a
Device 3 Memory Segment Start
Device 3
Disable
reserved
Device 3 Memory
Write Start
n/a
Device 3 Memory Cycle
15
14
13
12
11
10
9876543210
Device 4 Configuration Register
MEM[14h]
Default = 007F 7F80h
Read/Write
n/a
Device 4 Memory Segment End
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
n/a
Device 4 Memory Segment Start
Device 4
Disable
reserved
n/a
Device 4 SDRAM
Column Select
15
14
13
12
11
10
9876543210