Renesas SH7641 - Manual (Page 360)

Section 12 Bus State Controller (BSC)
Rev. 4.00 Sep. 14, 2005 Page 310 of 982
REJ09B0023-0400
Bit Bit Name
Initial
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
16
BW1
BW0
0
1
R/W
R/W
Number of Burst Wait Cycles
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