Error Case Summary - Compaq 21264 Hardware Reference Manual

Error Case Summary

Table 8–3 Error Case Summary (Continued)
Error Exception Status
Dcache single-bit CRD
ECC error on
speculative load
Dcache single-bit CRD
ECC error on small
store
Dcache single-bit None
ECC error on victim
read
Dcache second error MCHK
on store
Dcache duplicate tag MCHK
parity error
Bcache tag parity MCHK
error
Bcache single-bit MCHK
error on Icache fill and CRD
Bcache single-bit CRD
error on Dcache fill
Bcache victim read CRD
on Dcache/Bcache
miss
Bcache victim read None
on ECB
Memory single-bit MCHK
error on Icache fill and CRD
Memory single-bit CRD
error on Dcache fill
Bcache single-bit CRD
error on a probe hit
Bcache double-bit MCHK
error on Icache fill
Error Detection and Error Handling
8–10
DC_STAT[ECC_ERR_LD]
C_STAT contains zero
DC_STAT[ECC_ERR_ST]
None
1
DC_STAT[SEO]
1
C_STAT[DC_PERR]
C_ADDR[error address]
1
C_STAT[BC_PERR]
C_ADDR[error address]
C_STAT[ISTREAM_BC_ERR]
2
C_ADDR[error address]
C_SYNDROME_0
C_SYNDROME_1
DC_STAT[ECC_ERR_LD]
C_STAT[DSTREAM_BC_ERR]
C_ADDR[error address]
C_SYNDROME_0
C_SYNDROME_1
DC_STAT[ECC_ERR_LD]
C_STAT contains 0
None
C_STAT[ISTREAM_MEM_ERR]
2
C_ADDR[error address]
C_SYNDROME_0
C_SYNDROME_1
DC_STAT[ECC_ERR_LD]
C_STAT[DSTREAM_MEM_ERR]
C_ADDR[error address]
C_SYNDROME_0
C_SYNDROME_1
C_STAT[PROBE_BC_ERR]
C_ADDR[error address]
C_SYNDROME_0
C_SYNDROME_1
1
C_STAT[ISTREAM_BC_DBL]
C_ADDR[error address]
Hardware
Action
None
Corrected and
scrubbed
Corrected and
scrubbed
No correction
on either store
Uncorrectable
Uncorrectable
Icache flushed
Corrected and
scrubbed in
3
Dcache
None
None
Icache flushed
Corrected and
scrubbed in
3
Dcache
None
4
None
4
Alpha 21264/EV67 Hardware Reference Manual
PALcode Action
Log as CRD
Log as CRD
None
Log as MCHK
Log as MCHK
Log as MCHK
Scrub error as described
in Section D.36.
Log as CRD
Scrub error as described
in Section D.36.
Log as CRD
Log as CRD
None
Scrub error as described
in Section D.36.
Log as CRD
Scrub error as described
in Section D.36.
Log as CRD
May scrub error as
described in Section
D.36.
Log as CRD
Log as MCHK