Section 22 PCI Controller (PCIC)
SH7751 Group, SH7751R Group
Page 962 of 1128
R01UH0457EJ0301 Rev. 3.01
Sep 24, 2013
4. Word/longword (W/LW) boundary mode 3: Longword data is transferred as longword data x
1. (ALNMD = b'11)
Only longword access size is supported in the case of DMA transfers.
Figure 22.20 shows the data alignment in the respective boundary modes in DMA transfers.
Table 22.11 DMA Transfer Access Size and Endian Conversion Mode
Endian Conversion Mode
Local Bus
Endian
Data Transfer
Direction
Access
Size
W/LW Boundary
Mode (1 to 3)
Byte Data
Boundary Mode
Big endian
Local bus
↔
PCI bus
LW
Yes
Yes
Little endian
Local bus
↔
PCI bus
LW
Conversion not
required
Conversion not
required
B0
BE
=
0000
B1 B2 B3
Size =
LW
B3 B2 B1 B0
B3 B2 B1 B0
B2 B3 B0 B1
B0 B1 B2 B3
When lo
c
al bus is big endian
Local bus
PCI bus
Byte data
boundary mode
W/LW
boundary mode 1
W/LW
boundary mode 2
W/LW
boundary mode 3
B3
BE
=
0000
B2 B1 B0
Size =
LW
B3 B2 B1 B0
When lo
c
al bus is little endian
Local bus
PCI bus
31
0
31
0
31
0
31
0
31
0
31
0
31
0
Figure 22.20 Data Alignment at DMA Transfer
Содержание SH7751 Group
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Страница 1152: ...Appendix C Mode Pin Settings SH7751 Group SH7751R Group Page 1098 of 1128 R01UH0457EJ0301 Rev 3 01 Sep 24 2013 ...
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