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Registers
E
E
E-13
Message High Register (offset Ch)
MH[7..0]
Ch
Message High Register (offset Dh)
MH[15..8]
Dh
Message Low Register (offset Eh
ML[7..0]
Eh
Message Low Register (offset Fh)
ML[15..8]
Fh
See the description above for the operation of these registers.
VXI Register Base Address Decoding
To determine the VXI Register Base Address:
1. Read ULA as the lower 8 bits at 8151h. (xxxx xxxx aaaa aaaa).
2. Form the base address as 11aa aaaa aa00 0000, where aaaa aaaa are the lower 8
bits at 8151h.
3. The result is the binary representation of the VXI Register Base Address.
4. Thus the lowest possible base address is C000h (1100 0000 0000 0000) and the
highest possible base address is FFC0h (1111 1111 1100 0000). Note that the
range consists of base addresses separated by 40h.
5. Another view:
Base_addr = (ULA * 40h) + C000h
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