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