National Instruments VXI-AT2022 Getting Started page 44

NI-VXI Software Installation and Configuration
Table 3-1. Logical Address Configuration Characteristics (Continued)
Characteristic
Slave I/O Window
Base
Slave I/O Window
Size
Slave Mem Window
Size
Slave AT Mem Offset
VXI-AT2022/NI-VXI SCO UNIX Getting Started
Description
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.
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, or 0xff (DISABLE)
Indicates the size of VXI Shared RAM in the
A24 space. If the Address Space selection for
the AT-MXI is A16 only, this field is ignored.
Range = 8 MB, 4 MB, 2 MB, 1 MB, or
0xff (DISABLE)
Indicates the offset in the local RAM above
which the RAM is shared over the VXIbus in
A24 space.
Range = 0 to 15, in increments of 1 MB
3-8
Default Value
0x0
0xff
0xff
0 MB
(continues)
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Chapter 3