Compaq 21264 Hardware Reference Manual page 239

Table 8–3 Error Case Summary (Continued)
Error Exception Status
Bcache double-bit MCHK
error on Dcache fill
Memory double-bit MCHK
error on Icache fill
Memory double-bit MCHK
error on Dcache fill
1
Machine check taken in native mode. It is deferred while in PALmode.
2
CRD error posted in case the machine check is down a speculative path.
3
For a single-bit error on a non-target quadword, the error is not corrected in hardware,
but is corrected by PALcode during the scrub operation.
4
The contents of C_ADDR may not be accurate when there is heavy cache fill traffic.
Alpha 21264/EV67 Hardware Reference Manual
1
C_STAT[DSTREAM_BC_DBL]
C_ADDR[error address]
1
C_STAT[ISTREAM_MEM_DBL]
C_ADDR[error address]
1
C_STAT[DSTREAM_MEM_DBL]
C_ADDR[error address]
Error Case Summary
Hardware
Action
None
4
None
4
None
4
Error Detection and Error Handling
PALcode Action
Log as MCHK
Log as MCHK
Log as MCHK
8–11