Pci-Isa Bridge (Pib) Controller - Motorola MVME2700 Series Installation And Use Manual

Functional Description

PCI-ISA Bridge (PIB) Controller

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The MVME2700 uses a Winbond W83C553 bridge controller to supply
the interface between the PCI local bus and the ISA system I/O bus
(diagrammed in Figure
The PIB controller provides the following functions:
PCI bus arbitration for:
– ISA (Industry Standard Architecture) bus DMA
– The PHB (PCI Host Bridge) MPU/local bus interface function,
implemented by the Raven ASIC
– All on-board PCI devices
– The PMC (PCI Mezzanine Card) slot
ISA (Industry Standard Architecture) bus arbitration for DMA
devices
ISA interrupt mapping for four PCI interrupts
Interrupt controller functionality to support 14 ISA interrupts
Edge/level control for ISA interrupts
Seven independently programmable DMA channels
One 16-bit timer
Three interval counters/timers
Accesses to the configuration space for the PIB (PCI/ISA Bridge)
controller are performed by way of the CONADD and CONDAT
(Configuration Address and Data) registers in the Raven bridge controller
ASIC. The registers are located at offsets $CF8 and $CFC, respectively,
from the PCI I/O base address.
1-1).
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