SH7641 Datasheet, PDF (360/1036 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH™ RISC engine Family / SH7641 Series

Section 12 Bus State Controller (BSC)
Initial
Bit
Bit Name Value R/W Description
19
MPXMD
0
R/W Burst MPX-IO Interface Mode Specification
Specify the access mode in 16-byte access
0: One 4-burst access by 16-byte transfer
1: Two 2-bursts accesses by quad word (8-byte)
transfer
Transfer size when MPXMD = 0
D31 D30 D29 : Transfer Size
0 0 0 : Byte (1 byte)
0 0 1 : Word (2 byte)
0 1 0 : Longword (4 bytes)
0 1 1 : Reserved (quad word) (8 bytes)
1 0 0 : 16 bytes
1 0 1 : Reserved (32 bytes)
1 1 0 : Reserved (64 bytes)
Transfer size when MPXMD = 1
D31 D30 D29 : Transfer Size
0 0 0 : Byte (1 byte)
0 0 1 : Word (2 byte)
0 1 0 : Longword (4 bytes)
0 1 1 : Quad word (8 bytes)
1 0 0 : Reserved (32 bytes)
18

0
R
Reserved
This bit is always read as 0. The write value should
always be 0.
17
BW1
0
R/W Number of Burst Wait Cycles
16
BW0
1
R/W Specify the number of wait cycles to be inserted at the
2nd and the subsequent access cycles in burst access
00: No cycle
01: 1 cycle
10: 2 cycles
11: 3 cycles
Rev. 4.00 Sep. 14, 2005 Page 310 of 982
REJ09B0023-0400