NAME
bussw —
BusSwitch local peripheral bus
interface
SYNOPSIS
bussw0 at mainbus0 addr 0xfff00000
pcctwo0 at bussw0 offset 0x00000
DESCRIPTION
The bussw BusSwitch ASIC provides an
interface from the MVME197's 64-bit wide system bus to the MC68040
compatible 32-bit wide local bus, to which the system's I/O devices, e.g.
SCSI and Ethernet, are attached.
It includes the following features:
- Bus arbitration for the MC88110 bus
- Seven level interrupt handler
- Programmable map decoders
- Write post buffers
- Two tick timers
- Four 32-bit general purpose registers