Owner`s manual

Table 4–5 (Cont.): Machine Check Parameters
Parameter Description
RN, bits<3:0> The value of the E-box RN regis-
ter at the time of the fault, which
may indicate the last GPR refer-
enced by the E-box during speci-
fier or instruction flows.
SC Internal microcode-accessible register.
PC, PSL The program counter and processor status longword at the time of
the fault.
Table 4–6: Machine Check Codes
Code
(hex) Mnemonic and Description Restart Condition
01 MCHK_FP_PROTOCOL_ERROR
Protocol error during MF-chip operand/result
transfer
(R=1).(FPD=0).(UWP=0)
02 MCHK_FP_ILLEGAL_OPCODE
Illegal opcode detected by MF-chip
(R=1).(FPD=0).(UWP=0)
03 MCHK_FP_OPERAND_PARITY
Operand parity error detected by MF-chip
(R=1).(FPD=0).(UWP=0)
04 MCHK_FP_UNKNOWN_STATUS
Unknown status returned by MF-chip
(R=1).(FPD=0).(UWP=0)
05 MCHK_FP_RESULTS_PARITY
Returned MF-chip result parity error
(R=1).(FPD=0).(UWP=0)
08 MCHK_TBM_ACV_TNV
Translation buffer miss status generated in
ACV/TNV microflow
((R=1)+(FPD=1)).(UWP=0)
Where:
R is the VAX restart bit in the machine check stack frame
FDP is PSL<27>, First Part Done
UWP is RCSR<20>, Unlock Write Pending
TR2 is PCSTS<6>, Trap2
. is the logical AND operation
+ is the logical OR operation
KA65A CPU Module Registers 4–39