© National Instruments Corporation
2-1
VXI-MXI User 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)
