Motorola MVME2300 Series Service Manual download pdf (Page 39)

4-1

4Programming Model

Introduction

This chapter describes the programming model for the PMCspan.

21150 Configuration Registers

The PCI Configuration Registers for the DEC PCI-to-PCI Bridge 21150

chip are shown in Figure 4-1. For a detailed register bit description, refer

to the 21150 data sheet, DEC part number

EC-QPDLB-TE.

Configuration Transactions

PCI configuration transactions are used to initialize the PCI system

including the PCI-to-PCI bridge and devices on the PMC adapter. All

21150 registers are accessible only in the configuration space. In addition

to accepting configuration transactions for initialization of its own

configuration registers, the 21150 also forwards configuration transactions

bound for devices on the PMC adapter, as well as special cycle generation

on the secondary PCI bus. These two types of configuration transactions

are supported by Type 0 and Type 1 configuration cycles.

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Motorola MVME2300 Series Service Manual Page 39