VXi 320222-01 User Manual
Connector Descriptions
Appendix D
VXI-MXI User Manual
D-2
© National Instruments Corporation
The MXIbus defines 49 active signals, 12 ground lines, and 1 line for terminator power. Table
D-2 describes the signals on the MXIbus connector and groups them in five categories.
D-2 describes the signals on the MXIbus connector and groups them in five categories.
Table D-2. MXIbus Signal Groupings
Category
Description
Signal Name
Lines
Pin Numbers
Address/Data
Address/Data
AD[31-00]*
32
6-37
Address Modifier
AM[4-0]*
5
1-5
Address Strobe
AS*
1
39
Transfer Size
SIZE*
1
44
Read/Write
WR*
1
40
Data Strobe
DS*
1
38
Data Acknowledge
DTACK*
1
41
Parity
PAR*
1
43
Arbitration
MXIbus Busy
BUSY*
1
46
MXIbus Request
BREQ*
1
45
MXIbus Grant In
GIN*
1
60
MXIbus Grant Out
GOUT*
1
59
Interrupt
Interrupt Request
IRQ*
1
61
Utility
MXIbus Error
BERR*
1
42
Power
Ground
GND
12
47-58
Terminator Power
TERMPWR
1
62
Notice that there are 12 ground contacts on the connector. The 48 twisted ground lines in the
cable are generated from these lines under the cable connector hood. Also notice that although
there are two connector contacts required for the GIN*–GOUT* daisy-chain, only one signal line
is required in the cable assembly.
cable are generated from these lines under the cable connector hood. Also notice that although
there are two connector contacts required for the GIN*–GOUT* daisy-chain, only one signal line
is required in the cable assembly.
For more information, refer to the MXIbus specification.