Compaq 21264 - Manual (Page 238)

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