Emerson MVME147 User's Manual

Emerson Computer Hardware User's Manual - MVME147.
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GENERAL INFORMATION

Introduction

The MVME147 MPU VMEmodule contains a port to the Small Computer 
Systems Interface (SCSI) bus.  The hardware interface is the WD33C93 SCSI 
interface controller.  

To relieve you of having to follow SCSI bus protocol, the SCSI firmware allows 
you to pass commands to the bus through high level command packets.  
Standard command packets are furnished, as well as custom SCSI sequence 
packets that you may easily modify to fit particular applications.  With this 
method, the firmware interface can greatly speed up your software 
development cycle.  

The SCSI firmware resides in two 128K x 8 EPROMs and is co-resident with 
MVME147Bug, the debug monitor for the MVME147 MPU VMEmodule.  

Features

The SCSI firmware offers the following features: 

Custom SCSI sequence packets that allow creation of customized 
functions 

TARGET role 

Multitasking -- up to 64 concurrent peripheral devices 

High level support of SCSI devices 

Interrupt mode allows real-time applications 

Polled mode -- non-interrupt operation 

DMA with memory/scatter/gather 

Multiple-user interface allows concurrent operation through independent 

drivers 

Six entry points 

Thirty-one "canned" or standard function packets 

Modes of Operation

When using the SCSI firmware, you have a choice of two modes of operation: 

Interrupt mode and polled mode.  

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