PPC7A Product Manual
Functional Description
8-14
1
st
Edition
Keyboard and Mouse Controller
A PS/2 compatible Keyboard and Mouse interface with Phoenix BIOS is integrated into the Ultra I/O.
Connections to the mouse and keyboard are through the P2 connector. This interface is not available if
the USB build option is fitted. See Chapter 5 for pinouts.
VMEbus Interface
The Tundra Semiconductors CA91C142 Universe II PCI to VME bridge provides the VMEbus
interface. This complies with the VME64 specification and provides:
•
All slot 1 (system controller) functions
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Interrupt control
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A DMA controller
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Interprocessor communications
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Block transfer support
Appendix A details the VMEbus compliance and basic VMEbus performance of the PPC7A.
$
Note:
The Universe II does not self-address.
VMEbus Master Access
Four general-purpose, software-programmable PCI slave images are available for access to the VMEbus.
•
All of these can be configured to access VMEbus A32, A24 or A16 address space
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An offset may be applied to translate the local address to a different address on the VMEbus,
allowing any local address to access any VMEbus address
•
The start and end addresses of the A32, A24 and A16 PCI slave images may be set on any
64 Kbyte boundary in PCI memory or I/O space that is not allocated to other PCI-attached
devices or the user FLASH
•
One image may be set on 4 Kbyte boundaries to accommodate access to A16 space
One further, special purpose, PCI slave image allows mapping of A16 and A24 space.
•
This slave image uses a 64 Mbyte window, aligned to any 64 Mbyte address in PCI memory
space
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The window is divided into four 16 Mbyte quadrants
•
The top 64 Kbytes of each quadrant maps to A16 space, while the rest of each quadrant maps to
A24 space
•
The Address Modifiers generated are software configurable for each quadrant
VMEbus master cycles may be coupled or write posted.
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Coupled cycles are retried on the PCI bus until the Universe II has ownership of the VMEbus
and are not terminated on the PCI bus until all data has been transferred over the VMEbus
•
Posted writes are queued in a FIFO until the VMEbus is available for the data to be transferred
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