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Instruction Summary A-43
XO (22:30) Extended opcode for instructions with an OE field. Extended opcodes, in decimal,
appear in the instruction format diagrams presented with individual instructions. The
XO field name does not appear in instruction descriptions.
A.3.2 Instruction Format Diagrams
The instruction formats (also called “forms”) illustrated in Figure A-1 through Figure A-9 are valid
combinations of instruction fields. Table A-2 on page A-33 indicates which “form” is utilized by each
PPC405 opcode. Fields indicated by slashes (/, //, or ///) are reserved. The figures are adapted from
the PowerPC User Instruction Set Architecture.