Event Architecture; Exception Summary; Event Priority - Intel IXP45X Developer's Manual

®
Intel XScale Processor—Intel
When setting multiple CP15 registers, system software may opt to delay the assurance
of their update. This is accomplished by executing CPWAIT only after the sequence of
MCR instructions.
The CPWAIT sequence guarantees that CP15 side-effects are complete by the time the
CPWAIT is complete. It is possible, however, that the CP15 side-effect will take place
before CPWAIT completes or is issued. Programmers should take care that this does
not affect the correctness of their code.
3.8.3.4

Event Architecture

3.8.3.4.1

Exception Summary

Table 75
the attributes of each. Subsequent sections give details on each exception.
Table 75. Exception Summary
Exception Description
External Instruction
Instruction MMU
Instruction Cache Parity
Lock Abort
MMU Data
External Data
Data Cache Parity
Software Interrupt
Undefined Instruction
Debug Events
Notes:
1. Exception types are those described in the Intel
2. Refer to
3.8.3.4.2

Event Priority

The Intel XScale processor follows the exception priority specified in the ARM*
Architecture Reference Manual. The processor has additional exceptions that might be
generated while debugging. For information on these debug exceptions, see
Debug" on page
Table 76. Event Priority
Data Abort (Precise & Imprecise)
Undefined Instruction, SWI
August 2006
Order Number: 306262-004US
® ®
IXP45X and Intel IXP46X Product Line of Network Processors
shows all the exceptions that the Intel XScale processor may generate, and
Exception Type
Reset Reset
FIQ
IRQ
Prefetch
Prefetch
Prefetch
Data
Data
Data
Data
Software Interrupt
Undefined Instruction
2
varies
"Software Debug" on page 111
111.
Exception
Reset
FIQ
IRQ
Prefetch Abort
1
Precise
FIQ
IRQ
varies
®
StrongARM
for more details
Priority
1 (Highest)
6 (Lowest)
® ®
Intel IXP45X and Intel IXP46X Product Line of Network Processors
Updates FAR
N N
N N
N N
Y N
Y N
Y N
Y N
Y Y
N N
N N
Y N
Y N
N
*
manual, section 2.5.
2
3
4
5
Developer's Manual
"Software
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