The address for a read operation from an MCR is:
001520 19 18 163133 32
MR−0075−93RAGS
0
1
C22 MCR# XXXXX0
Bit fields have the following meanings:
Bit
Field Contents
4:0 Ignored on write operations
15:5 Ignored on read operations; on write operations:
Bit
Field Contents
8:5 Mask (<26:23>) bits on the data bus are ignored; the data is in the
address bits.
9:15 Compare (<29:23>)
18:16 MCR#; not pertinent to I/O read operations
19 0
31:20 C22 is part of the hexadeimal MCR address
32 1
33 0
The data returned by a read operation from an MCR are:
05 04 0009 08151631
MR−0076−93RAGS
UNPREDICTABLE COMPARE<29:23> UNP
MASK
<26:23>
Address ASIC Registers (400/500/600/700/800/900 Models) 4–5
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