User's Manual

Chapter 2

General Description

This chapter contains the physical and electrical specifications for the VXI-MXI and describes

the characteristics of key interface board components.

Electrical Characteristics

All integrated circuit drivers and receivers used on the VXI-MXI meet the requirements of the

VMEbus specification. Table 2-1 contains a list of the VMEbus signals used by the VXI-MXI

and the electrical loading presented by the circuitry on the interface board (in terms of device

types and their part numbers).

Note: Throughout this manual, an asterisk (*) following a bus signal mnemonic indicates

that the signal is active low.

Table 2-1. VXI-MXI VMEbus Signals

Driver Device Receiver Device

Bus Signals Part Number Part Number

D[31–0], A[31–1], ALS645–1 ALS645–1

AM[5–0], LWORD ALS646–1 ALS646–1

DS0*, DS1*, WRITE* F125 ALS244

AS* F125 ALS240

SYSCLK F125 –

BG[3-0]IN* – HCT273,

GAL16V8

BG[3-0]OUT* LS32 –

BBSY*, SYSFAIL*, ACFAIL* F38 ALS240

BR[3-0]*, DTACK*, BERR* F38 ALS244

SYSRESET* AS760 ALS244

IACK* F38 –

(continues)