Intel iapx 432 manual Fault Summary

FAULT SUMMARY

The Peripheral Subsystem status, context/process status, processor status, and system timer fields contain the values of the the

corresponding on-chip registers at the time of the fault. The o:perator id, which differs fran the opcode field in an instruction, specifies the operator that causes the fault. If a fault occurs during instruction decoding, the operator id is zero. The operator id value of each operator is the same as the index found in Appendix

B.

The execution state indicates the phase of execution when the fault occured. It is used to identify fault handling strategies in the nnre complex operators. A value of zero indicates the instruction can be re-executed with m rewind necessary. Non-zero execution state occurs in port and IPC operators only. The semantics of each execution state in the port operators is described in the 432 GOP Architecture Reference Manual. The organization of the execution state field is shown below.

8 bits 8 bits

!--------

!----------------------

execution state reserved

Memory Access Faults

The ZZ field specifies the type of menory access attempted The encooing

of the ZZ field is specified below.

ZZAccess Type

XIOTITl'I' OXMWBBBB Access Memory

XIOTITl'I' lOMWBBBB Access Interconnect

XIOTITl'I' llMWBBBB Access Access Segment

The TITl'I' field specifies the type of mennry access fault. The

encoding of the TITl'I' field is specified below. Note that combinations of these encodings can occur.

XXXXI AR _Access Rights Fault

XXXlX SB Segment Bounds Fault

XXIXX M) Memory Overflow Fault

(physical address >= 2**24)

XIXXX BE Bus Error Fault

lXXXX WR Test Write Rights Fault

The M field specifies whether the fault was on a read-modify-write access. A value of zero indicates a normal access. A value of one indicates a read~ify-writeaccess.

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