DEC Digital Alpha VME 4/224 User Manual page 147

Table 6–3 (Cont.) Error and Diagnostic Status Register
Field Name
<8:6> CREQCAUSE
<5> VICCAUSE
<4> DMACAUSE
<3> NXMERR
<2> BC_TCPERR
<1> BC_TAPERR
<0> LOSTERR
Type Description
RO Cycle request caused error. Indicates the
DMA or CPU cycle request type that caused
the error. Contains a copy of either the
cpucreq or iocmd signal lines, depending
on DMACAUSE<4>. Locked with the
error address. Only valid when an error is
indicated on BC_TAPERR, BC_TCPERR, or
MEMERR.
RO Victim write caused error. When set,
indicates that a victim write transaction
caused an NXMERR error. Undefined for
other types of errors. Locked with the
error address. Valid only when an error is
indicated on BC_TAPERR, BC_TCPERR, or
MEMERR.
RO DMA transaction caused error. When set,
indicates that a DMA transaction caused a
BC_TAPERR, BC_TCPERR, or NXMERR
error. Locked with the error address. Valid
only when an error is indicated on BC_
TAPERR, BC_TCPERR, or MEMERR.
RW1C, 0 Nonexistent memory error. When set,
indicates that a read or write transaction
occurred for an address that does not map
to any memory bank, CSR, or I/O quadrant.
Set only when address is unlocked.
RW1C, 0 Bcache tag control parity. When set,
indicates that a tag probe encountered
bad parity in the tag control RAM. Set only
when address is unlocked.
RW1C, 0 Bcache tag address parity. When set,
indicates that a tag probe encountered bad
parity in the tag address RAM. Set only
when address is unlocked.
RW1C, 0 Lost error, multiple errors. When set,
indicates that additional errors occurred
after an error address was locked. No
address or cause information is latched for
the error.
Cache and Memory Subsystem 6–15