IPR-NIOS Altera, IPR-NIOS Datasheet - Page 85

• Manufacturer Part Number: IPR-NIOS
• Description: IP NIOS II MEGACORE RENEW
• Manufacturer: Altera
• Type: MegaCorer

Specifications of IPR-NIOS

• License: Renewal License
• Lead Free Status / RoHS Status: Not applicable / Not applicable

Chapter 3: Programming Model
Exception Processing
December 2010 Altera Corporation
Instruction-Related Exceptions
1
Instruction-related exceptions occur during execution of Nios II instructions. When
they occur, the processor perform the steps outlined in
on page
The Nios II processor generates the following instruction-related exceptions:
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All noninterrupt exception handlers must run in the normal register set.
Trap Instruction
When a program issues the trap instruction, the processor generates a software trap
exception. A program typically issues a software trap when the program requires
servicing by the operating system. The general exception handler for the operating
system determines the reason for the trap and responds appropriately.
Break Instruction
The break instruction is treated as a break exception. For more information, refer to
“Break Exceptions” on page
Unimplemented Instruction
When the processor issues a valid instruction that is not implemented in hardware, an
unimplemented instruction exception is generated. The general exception handler
determines which instruction generated the exception. If the instruction is not
implemented in hardware, control is passed to an exception routine that might choose
to emulate the instruction in software. For more information, refer to
Unimplemented Instructions” on page
Trap instruction
Break instruction
Unimplemented instruction
Illegal instruction
Supervisor-only instruction
Supervisor-only instruction address
Supervisor-only data address
Misaligned data address
Misaligned destination address
Division error
Fast TLB miss
Double TLB miss
TLB permission violation
MPU region violation
3–43.
3–34.
3–60.
“Exception Processing Flow”
Nios II Processor Reference Handbook
“Potential
3–39