NI-VXI Software Installation and Configuration
Chapter 3
VXI-AT2000/NI-VXI MS-DOS Getting Started
3-10
© National Instruments Corporation
Table 3-1. Logical Address Configuration Characteristics (Continued)
Characteristic
Description
Default Value
Slave DMA Channel
This indicates the slave DMA channel to be
used in all slave accesses to the VXI Shared
RAM in A24 space or the PC I/O in A16 space.
This value must correspond to jumper settings
on the AT-MXI board. The NONE option can
be selected with any jumper settings.
Range = 0, 1, 2, 3, 5, 6, 7, NONE
Note: If the NONE option is selected, slave
accesses to VXI Shared RAM and to PC
I/O space will not succeed. Accesses to
VXI-defined registers on the AT-MXI board,
however, remain unaffected.
3
Slave I/O Window
Base
The I/O space in the PC with the AT-MXI can
be accessed in A16 space over the VXIbus.
This field sets up the base address for these
accesses.
Range = 0000h to FE00h in increments of
100h (hex)
Note: Never select a base address above
C000h. Selecting an address above C000h
can conflict with the existing VXI and VME
devices in the system. Because the VXIbus
specification does not address automatic
configuration of the lower 48 KB of A16
space,
RESMAN
does not handle any device
requesting memory in A16 space, including
the AT-MXI.
RESMAN
does not give a
warning in the event of an address conflict in
A16 space. Also, the opening of A16 windows
on frame extenders in the system for A16
accesses depends only on the logical addresses
of the devices in the system.
0x0000
Slave I/O Window
Size
Indicates the size of the window in A16 space
for accesses to the PC I/O space over the
VXIbus.
Range = 64 KB, 32 KB, 16 KB, 8 KB, 4 KB,
2 KB, 1 KB, 512 bytes, DISABLE
DISABLE
(continues)
