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Chapter 4
12-11r/w 1
10-8r/w
A16SIZE[2-0]
7-0r/w
A16BASE[7-0]
A16 Window Example:
A16BASE
any value
3F
80
26
49
98
42
A1
55
55
55
55
55
55
55
55
© National Instruments Corporation
A16EN
A16DIR
0
1
Reserved Bits
These bits are reserved and read back as ones. Write a zero when
writing to these bits.
A16 Window Size Bits
This 3-bit number specifies the number of significant address bits
in the A16BASE field that are compared when determining if an
address is in the A16 window. The number of A16 addresses in
the window is 256 * 2
The minimum size of an A16 window is 512 B and the maximum
size is 48 KB (A16SIZE = 0).
A16 Window Base Address Bits
These bits, in conjunction with the A16SIZE bits, define the base
address of the A16 window for the VXI-MXI. The A16SIZE bits
indicate the number of A16BASE bits that are most significant.
A16BASE7 is the most significant and A16BASE0 is the least.
The A16BASE bits that are not significant can be replaced with
zeros to provide the base address of the A16 window.
A16SIZE
A16 Addresses in Window
0
0000 to BFFF
1
0000 to 7FFF
2
8000 to BFFF
3
2000 to 3FFF
4
4000 to 4FFF
5
9800 to 9FFF
6
4000 to 43FF
7
A000 to A1FF
0
0000 to BFFF
1
0000 to 7FFF
2
4000 to 7FFF
3
4000 to 5FFF
4
5000 to 5FFF
5
5000 to 57FF
6
5400 to 57FF
7
5400 to 55FF
4-15
Window Applies to
X
Disabled
VXI cycles to MXI cycles
0
1
MXI cycles to VXI cycles
8-i
where i is the value of A16SIZE[2-0].
Register Descriptions
VXI-MXI User Manual
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