iAPX 432 Interface Processor Architecture Reference Manual
The W field specifies whether the fault was on a read or write access. A value of zero indicates a read access. A value of one indicates a write access.
The faulted displacement is recorded in the fault displacement (in access memory, or interconnect), and in the object index field of the fault object selector (in access access segment).
The BBBB field, which designates which segment was being accessed when the fault occurred, is defined as follows:
BBBB Segment Name
0000 Context AS
0001 Entry AS 1
0010 Entry AS 2
0011 Entry AS 3
0100 Object Table Directory
0101 Object Table
0110 Processor AS
0111 Processor DB
1000 Context DB
1001 Process AS
1010 Process DB
1011 WorkA (Carrier OS)
1100 WorkB (Carrier AS)
1101 WorkC (Port OS)
1110 WorkD (Port AS)
1111 Mapping Facility
System Type Or Descriptor Type Faults
The fault code for system type or descr iptor type faults is as follows:
DIIXXXXX KKKKKKKK
The D field indicates which
The KKKKKKKK field indicates the desired system type, or the desired obj ect descr iptor type, descr iptor validity, base type, and storage associated bit fields.
All Other Faults
The fault code for all other faults is as follows:
XOXXXXXX XX'I'I'EEEE