4-9
Themis Computer
4—Universe II Description
Slave Image Programming
4.3
Slave Image Programming
The Universe II recognizes two types of accesses on its bus interfaces: accesses des-
tined for the other bus and accesses decoded for its own register space.
4.3.1
VME Slave Images
A VMEbus slave image is used to access the resources of the PCI bus when the Uni-
verse II is not the VMEbus master. The user may control the type of accesses by pro-
gramming specific attributes of the VMEbus slave image. The Universe II will only
accept accesses to the VMEbus from within the programmed limits of the VMEbus
slave image.
Table 4-3.
PCI Configuration Base Address 0 Register (PCI_BS0)
a
BIts
Name
Description
Reset
State
Ac-
cess
[31:12]
BS
Base Address
0
R/W
00
SPACE
PCI Bus Address Space: 0 = Memory; 1 = I/O
Power-up
Options
R
a—All other bits are Read 0.
Table 4-4.
PCI Configuration Base Address 1 Register (PCI_BS1)
a
BIts
Name
Description
Reset
State
Ac-
cess
[31:12]
BS
Base Address
0
R/W
00
SPACE
PCI Bus Address Space: 0 = Memory; 1 = I/O
Power-up
Options
R
a—All other bits are Read 0.
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