I/O And Id Space Accesses - Motorola MVME172 Programmer's Reference Manual

IP2 Chip

I/O and ID Space Accesses

4
SPACE
IP_a,b,c or _d
(I/O or ID)
IP_ab or _cd
(I/O Only)
4-54
The following table shows the data routing when accessing IP I/O or ID
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.
LBSIZE LBA IPA
0 0
1 1
BYTE
2 2
3 3
0 0
WORD
2
2
0 0
LWORD
0 0
1 1
BYTE
2 0
3 1
0 0
WORD
2
0
0 0
LWORD
LD<31-24> LD<23-16>
IPXD<15-8>
IPXD<7-0>
IPXD<15-8>
IPXD<15-8> IPXD<7-0>
IPXD<15-8> IPXD<7-0>
IPBD<15-8>
IPBD<7-0>
IPBD<15-8> IPBD<7-0>
IPBD<15-8> IPBD<7-0>
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LD<15-8> LD<7-0>
IPXD<7-0>
IPXD<15-8> IPXD<7-0>
IPAD<15-8>
IPAD<7-0>
IPAD<15-8> IPAD<7-0>
IPAD<15-8> IPAD<7-0>