Introduction; Summary Of Major Features - Motorola MVME162FX Programmer's Reference Manual

Introduction

This chapter defines the VMEchip2 ASIC, local bus to VMEbus
interface chip.
The VMEchip2 interfaces the local bus to the VMEbus. In addition
to the VMEbus defined functions, the VMEchip2 includes a local
bus to VMEbus DMA controller, VME board support features, and
Global Control and Status Registers (GCSR) for interprocessor
communications.

Summary of Major Features

Local Bus to VMEbus Interface:
Ð Programmable local bus map decoder.
Ð Programmable short, standard, and extended VMEbus
addressing.
Ð Programmable AM codes.
Ð Programmable 16-bit and 32-bit VMEbus data width.
Ð Software-enabled write posting mode.
Ð Write post buffer (one cache line or one four-byte).
Ð Automatically performs dynamic bus sizing for VMEbus
cycles.
Ð Software-configured VMEbus access timers.
Ð Local bus to VMEbus Requester:
Software-enabled fair request mode;
Software-configured release modes:
Release-When-Done (RWD), and
Release-On-Request (ROR); and
Software-configured BR0*-BR3* request levels.
2VMEchip2
2
2-1