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Chapter 4 Register Descriptions
© National Instruments Corporation 4-11 VXI-MXI User Manual
LAEN LADIR 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 LASIZE[2-0] Logical Address Window Size Bits
This 3-bit number specifies the number of significant address bits
in the LABASE field that are compared when determining if an
address is in the logical address window. The number of logical
addresses in the window is 2
8-i
where i is the value of LASIZE
[2-0]. Because i can range from 0 to 7, the minimum size of a
logical address window is 2, and the maximum size is 256.
7-0r/w LABASE[7-0] Logical Address Window Base Address Bits
These bits, in conjunction with the LASIZE bits, define the base
address of the Logical Address window for the VXI-MXI. The
LASIZE bits indicate the number of LABASE bits that are most
significant. LABASE7 is the most significant, and LABASE0 is
the least. The LABASE bits that are not significant can be
replaced with zeros to provide the base address of the logical
address window.
Logical Address Window Example:
LABASE LASIZE Logical Addresses in Window
any value 0 00 to FF
00 1 00 to 7F
08 2 00 to 3F
18 3 00 to 1F
3F 4 30 to 3F
55 5 50 to 57
88 6 88 to 8B
CC 7 CC to CD
AA 0 00 to FF
AA 1 80 to FF
AA 2 80 to BF
AA 3 A0 to BF
AA 4 A0 to AF
AA 5 A8 to AF
AA 6 A8 to AB
AA 7 AA to AB