Publication No. PPC11A-HRM/1
Functional Description 39
4.9.10 VMEbus Retries
The Universe II chip, as a PCI target, retries the PCI master under the following
conditions:
•
The PCI initiator requests a coupled cycle to the VMEbus while the Universe II is
not VMEbus master
•
The PCI initiator requests a coupled cycle to the VMEbus while the posted write
FIFO still contains data
•
The PCI initiator requests a posted write cycle when the posted write FIFO can
accept no more entries
The Universe II does not support the VMEbus RETRY~ signal.
4.10
I/O
The PPC11A has the following I/O connectivity:
Due to pin-out restrictions, some I/O options share pins on the various connectors.