Motorola MVME172 ユーザーズマニュアル
4-54
Computer Group Literature Center Web Site
IP2 Chip
4
I/O and ID Space Accesses
The following table shows the data routing when accessing IP I/O or ID
space.
space.
SPACE refers to the IndustryPack space being accessed.
LBSIZE refers to local bus transfer size.
LBA refers to local bus address signals 1,0.
IPA refers to IndustryPack address signals 2,1,0.
LD refers to the local data bus.
IPXD refers to the IP_a data bus (IPAD) when accessing IP_a or IP_c. It
refers to the IP_b data bus (IPBD) when accessing IP_b or IP_d.
refers to the IP_b data bus (IPBD) when accessing IP_b or IP_d.
SPACE
LBSIZE
LBA
IPA
LD<31-24>
LD<23-16>
LD<15-8>
LD<7-0>
IP_a,b,c or _d
(I/O or ID)
(I/O or ID)
BYTE
0
0
IPXD<15-8>
1
1
IPXD<7-0>
2
2
IPXD<15-8>
3
3
IPXD<7-0>
WORD
0
2
0
IPXD<15-8>
IPXD<7-0>
2
IPXD<15-8>
IPXD<7-0>
LWORD
0
0
IPXD<15-8>
IPXD<7-0>
IP_ab or _cd
(I/O Only)
(I/O Only)
BYTE
0
0
IPBD<15-8>
1
1
IPBD<7-0>
2
0
IPAD<15-8>
3
1
IPAD<7-0>
WORD
0
2
0
IPBD<15-8>
IPBD<7-0>
0
IPAD<15-8>
IPAD<7-0>
LWORD
0
0
IPBD<15-8>
IPBD<7-0>
IPAD<15-8>
IPAD<7-0>