Motorola MPC533 Reference Manual page 1042

Class-Based Compression Model Main Principles
G.2.9 Instruction Class Structures and Programming
The four possible compression layouts of an instruction and their attributes are listed in this
section. See Section G.4, "Decompressor Class Configuration Registers (DCCR0-15)," for
the instruction class attributes and more programming details.
G.2.9.1 Global Bypass
This instruction is not compressed at all.
Msb
0 0 0 0
This class does not have a configuration register. Its prefix is hard-wired to '0000' and no
other attributes are needed.
G.2.9.2 Single Segment Full Compression – CLASS_1
This instruction is compressed into a single segment. The vocabulary table pointer points
to an offset in tables of all RAMs (DECRAMs).
.
Msb
4-bit class
The definition of the class includes:
• TP1 length=2-9
• TP2 length=0
G-10
PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE
Uncompressed Instruction
32-bit segment – to be bypassed
Compressed Instruction
Figure G-6. Global Bypass Instruction Layout
Uncompressed Instruction
32-bit segment – to be compressed
Compressed Instruction
2-to 9-bit TP1
Figure G-7. CLASS_1 Instruction Layout
MPC533 Reference Manual
32-bit bypass data
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