AMCC Proprietary 157
Revision 1.02 - September 10, 2007
PPC405 Processor
Preliminary User’s Manual
9. Instruction Set
Descriptions of the PPC405 instructions follow. Each description contains the following elements:
• Instruction names (mnemonic and full)
• Instruction syntax
• Instruction format diagram
• Pseudocode description
• Prose description
• Registers altered
• Architecture notes identifying the associated PowerPC Architecture component
Where appropriate, instruction descriptions list invalid instruction forms and exceptions, and provide programming
notes.
9.1 Instruction Set Portability
To support embedded real-time applications, the instruction sets of the PPC405 and other controllers implement
the PowerPC Embedded Environment, which is not part of the PowerPC Architecture defined in
The PowerPC
Architecture: A Specification for a New Family of RISC Processors
.
Programs using these instructions are not portable to PowerPC implementations that do not implement the
PowerPC Embedded Environment.
The PPC405 implements a number of implementation-specific instructions that are not part of the PowerPC Archi-
tecture or the PowerPC Embedded Environment, which are listed in Table 9-1. In the table, the syntax [o] indicates
that an instruction has an o form, which updates the XER[SO,OV] fields, and a non-o form. The syntax [.] indicates
that an instruction has a record form, which updates CR[CR0], and a non-record form.
9.2 Instruction Formats
For more detailed information about instruction formats, including a summary of instruction field usage and instruc-
tion format diagrams for the PPC405, see “Instruction Formats” on page 157.
Instructions are four bytes long. Instruction addresses are always word-aligned.
Table 9-1. Implementation-Specific Instructions
dccci
dcread
iccci
icread
macchw[o][.]
macchws[o][.]
macchwsu[o][.]
macchwu[o][.]
machhw[o][.]
machhws[o][.]
machhwsu[o][.]
machhwu[o][.]
maclhw[o][.]
maclhws[o][.]
maclhwsu[o][.]
maclhwu[o][.]
mfdcr
mtdcr
mulchw[.]
mulchwu[.]
mulhhw[.]
mulhhwu[.]
mullhw[.]
mullhwu[.
]
nmacchw[o][.]
nmacchws[o][.]
nmachhw[o][.]
nmachhws[o][.]
nmaclhw[o][.]
nmaclhws[o][.]
rfci
tlbre
tlbsx[.]
tlbwe
wrtee
wrteei
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