Sun Microelectronics
185
11. Error Handling
11.4 UltraSPARC Data Buffer (UDB) Control Register
Name: ASI_UDBH_CONTROL_REG_WRITE
ASI=77
16
, VA<63:0>=20
16
Name: ASI_UDBH_CONTROL_REG_READ
ASI=7F
16
, VA<63:0>=20
16
Name: ASI_UDBL_CONTROL_REG_WRITE
ASI=77
16
, VA<63:0>=38
16
Name: ASI_UDBL_CONTROL_REG_READ
ASI=7F
16
, VA<63:0>=38
16
VERSION: 4-bit mask set revision number for the selected UDB chip.
F_MODE: If set, the contents of the FCBV field are sent with the out-going
transaction, instead of the generated ECC.
FCBV: Force check bit vector.
11.5 Overwrite Policy
This section describes the overwrite policy for error bits when multiple errors
conditions have occurred. Errors are captured in the order that they are detected,
not necessarily in program order.
If an error occurs at the same time as error bits are cleared by software, then the
overwrite control will include the effect of the software clear. For example, if ETP
was set (which blocks E-Cache tag syndrome updates) and software clears the
ETP bit at the same time as an E-Cache tag parity error occurs, the E-Cache tag
syndrome will be updated.
11.5.1 AFAR Overwrite Policy
Priority for AFAR updates: UE > CE > {TO, BE}
Table 11-8 UDB Error Register Format
Bits Field Use RW
<63:13> Reserved —R
<12:9> VERSION UDB version number R
<8> F_MODE Force ECC error RW
<7:0> FCBV Force check bit vector RW
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