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PCI Peripheral Bus Controller (PBC)
The MCPN750A uses the VIA Technologies VT82C586B Peripheral Bus
Controller (PBC) to supply the interface between the PCI local bus and the
ISA, EIDE and USB systems I/O bus (as shown in
The PBC controller provides the following functions:
Accesses to the configuration space for the PBC 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.
ISA Interface
The PBC provides an ISA bus compatible interface. The ISA interface
provides programmable timing and chip selects for ISA compatible
peripherals. The ISA bus is used to interface to the serial port's
NVRAM/RTC chip and various board status registers.
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ISA (Industry Standard Architecture) bus arbitration for DMA
devices (Note: feature not used since there are no ISADMA
devices).
EIDE Interface
USB Interface
Seven independently programmable DMA channels (Note: feature
not used since there are no ISA DMA devices).
Interrupt controller functionality to support 14 ISA interrupts
Edge/level control for ISA interrupts
Steerable PCI interrupts (Note: feature not used. Interrupt steering
via Raven ASIC).
Three interval counters/timers (82C54 functionality)
Block Diagram
Figure 6-1
on page 6-4).
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6
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