HD6417034 Datasheet, PDF (642/691 Pages) Renesas Technology Corp – SuperH RISC ENGINE SH7032 AND SH7034

A.2.40 Bus Control Register (BCR)
BSC
• Start Address: H'5FFFFA0
• Bus Width: 8/16/32
Register Overview:
Bit: 15
14
13
12
11
10
9
8
Bit name: DRAME IOE WARP RDDTY BAS
—
—
—
Initial value: 0
0
0
0
0
0
0
0
R/W: R/W R/W R/W R/W R/W
—
—
—
Bit: 7
6
5
4
3
2
1
0
Bit name: —
—
—
—
—
—
—
—
Initial value: 0
0
0
0
0
0
0
0
R/W: —
—
—
—
—
—
—
—
Table A.41 BCR Bit Functions
Bit
Bit Name
15
DRAM enable (DRAME)
14
Multiplex I/O enable (IOE)
13
Warp mode (WARP)
12
RD duty (RDDTY)
11
Byte access select (BAS)
Value
0
1
0
1
0
1
0
1
0
1
Description
Area 1 is external memory space
(Initial value)
Area 1 is DRAM space
Area 6 is external memory space
(Initial value)
Area 6 is address/data multiplex I/O space
Normal mode: External access and internal
access not performed simultaneously
(Initial value)
Warp mode: External access and internal
access performed simultaneously
RD signal high width duty ratio is 50%
(Initial value)
RD signal high width duty ratio is 35%
WRH, WRL, and A0 signals valid
(Initial value)
WR, HBS, and LBS and signals valid
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