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Chapter 4 Register Descriptions
© National Instruments Corporation 4-23 VXI-MXI User Manual
A32EN A32DIR Window Applies to
0 X Disabled
10
VXI cycles to MXI cycles
1 MXI cycles to VXI cycles
12-11r/w 1 Reserved Bits
These bits are reserved and read back as ones. Write a zero when
writing to these bits.
10-8r/w A32SIZE[2-0] A32 Window Size Bits
This 3-bit number specifies the number of significant address bits
in the A32BASE field that are compared when determining if an
address is in the A32 window. The number of A32 addresses in
the window is 16,777,216 * 2
8-i
where i is the value of
A32SIZE[2-0]. The minimum size of an A32 window is 32 MB,
and the maximum size is 4 GB.
7-0r/w A32BASE[7-0] A32 Window Base Address Bits
These bits, in conjunction with the A32SIZE bits, define the base
address of the A32 window for the VXI-MXI. The A32SIZE bits
indicate the number of A32BASE bits that are most significant.
A32BASE7 is the most significant and A32BASE0 is the least.
The A32BASE bits that are not significant can be replaced with
zeros to provide the base address of the A32 window.
A32 Window Example:
A32BASE A32SIZE A32 Addresses in Window
any value 0 00000000 to FFFFFFFF
C8 1 80000000 to FFFFFFFF
3E 2 00000000 to 3FFFFFFF
49 3 40000000 to 5FFFFFFF
9A 4 90000000 to 9FFFFFFF
21 5 20000000 to 27FFFFFF
75 6 74000000 to 77FFFFFF
19 7 18000000 to 19FFFFFF
FF 0 00000000 to FFFFFFFF
FF 1 80000000 to FFFFFFFF
FF 2 C0000000 to FFFFFFFF
FF 3 E0000000 to FFFFFFFF
FF 4 F0000000 to FFFFFFFF
FF 5 F8000000 to FFFFFFFF
FF 6 FC000000 to FFFFFFFF
FF 7 FE000000 to FFFFFFFF