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Chapter 3
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
© National Instruments Corporation
Description
The I/O space in the PC with the AT-MXI
can be accessed in A16 space over the VXI
bus. This field sets up the base address for
these accesses.
Range = 0000h to FE00h in increments of
100h (hex)
Notice that selecting a base address above
C000h can conflict with the existing VXI
devices in the system. 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, opening
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 = 64K, 32K, 16K, 8K, 4K, 2K, 1K,
512 bytes, 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 = 8M, 4M, 2M, 1M
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 1M
3-7
NI-VXI Software Installation and Configuration
VXI-AT2023/NI-VXI ISC 386/ix Getting Started
Default Value
0x0000
0xff
1 megabyte
0 megabytes
(continues)
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