Panasonic MN103001G/F01K User Manual
Page 126
Bus Controller (BC)
8-12
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~
~
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Memory control register 1B
Register symbol: MEMCTR1B
Address:
x’32000022
Purpose:
Sets the bus mode, access timing, etc., for external memory space block 1.
Bit No.
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Bit
B1
B1
B1
B1
B1
B1
B1
B1
B1
B1
–
B1
B1
B1
–
B1
name
WEN4WEN3WEN2WEN1WEN0 ASN2 ASN1 ASN0 ASA1 ASA0
BW
PE
BM
DRAM
Reset
1
1
1
0
1
0
1
1
0
1
0
1
0
0
0
0
Access
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R
R/W
R/W
R/W
R
R/W
When not using DRAM (Memory control register 1B B1DRAM = 0)
Bit No.
Bit name
Description
Setting conditions
0
DRAM
Block 1 DRAM
0: Do not use as DRAM space.
space setting
2
BM
Block 1 bus mode
0: Synchronous mode (SYSCLK synchronization)
1: Asynchronous mode (MCLK synchronization)
3
PE
Block 1 software page
Not using
mode enable
4
BW
Block 1 bus width
0:
8 bits
1:
16 bits
7 to 6
ASA1 to 0
AS assert timing
00:
0MCLK
11:
3MCLK
10 to 8
ASN2 to 0
AS negate timing
000:
prohibited
Set so that:
001:
1MCLK
ASN
≥
ASA
111:
7MCLK
15 to 11
WEN4 to 0
WE negate timing
Settings other than those shown below are prohibited.
Set so that:
00011:
3MCLK
WEN
≥
EA
11111:
31MCLK