Motorola MPC823e User Manual

The PowerPC Core
6-14 MPC823e REFERENCE MANUAL MOTOROLA
CORE
6
6.3.8 Interrupt Ordering
There are two main types of interrupts:
• Instruction-related interrupts
• Asynchronous interrupts
Instruction-related exceptions (interrupt causes) are detected while the instruction is in
various stages of being processed by the core. Exceptions found early in instruction
processing preclude detection of further exceptions. This earlier interrupt will eventually be
taken. If more than one instruction in the pipeline causes an exception, only the first
exception is taken and causes an interrupt. The remaining instruction-induced exceptions
are ignored. The following table lists the instruction-related interrupts in the order of
detection within the instruction processing.
Table 6-5. Instruction-Related Interrupt Detection Order
NUMBER INTERRUPT TYPE CAUSE
1 Trace
Trace Bit Asserted
1
2 Implementation Dependent Instruction TLB
Miss
Instruction Memory Management Unit TLB Miss
3 Implementation Dependent Instruction TLB
Error
Instruction Memory Management Unit
Protection / Translation Error
4 Machine Check Interrupt Fetch Error
5 Debug I- Breakpoint Match Detection
6 Implementation Dependent Software Emulation
Interrupt
Attempt to Invoke Unimplemented Feature
1 Floating-Point Unavailable Attempt to is Made to Execute Floating-Point
Instruction and MSR
FP
=0
7
2
Privileged Instruction Attempt to Execute Privileged Instruction in
Problem Mode
Alignment Interrupt Load/Store Checking
System Call Interrupt SC Instruction
Trap Trap Instruction
8 Implementation Dependent Data TLB Miss Data Memory Management Unit TLB Miss
9 Implementation Dependent Data TLB Error Data Memory Management Unit TLB Protection/
Translation Error
10 Machine Check Interrupt Load or Store Access Error
11 Debug L- Breakpoint Match Detection
NOTES: 1. The trace mechanism is implemented by letting one instruction go as if no trace is enabled and
trapping the second instruction. This, of course, refers to this second instruction.
2. Exclusive for any one instruction.

Motorola MPC823e Specifications

General

Brand	Motorola
Model	MPC823e
Category	Computer Hardware
Language	English