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Release 1.0, 1 July 2002 F. Chapter P Error Handling
197
sTLB Way Reduction
When a way reduction condition is recognized for the
sTLB
way W (W =0 or 1),
hardware executes the following way reduction procedures:
1. When only one way in sTLB is active because of previous way reductions:
■
The previously reduced way is reactivated.
2. Regardless of how many ways were previously active, way reduction occurs:
■
Hardware reduces the way and invalidates all entries in sTLB way W. Way W
will never be refilled.
■
The restrainable error
ASI_AFSR.DG_L1$U2$STLB
is reported to software.
P.11 Handling of Extended UPA Bus Interface
Error
This section specifies how SPARC64 V handles UPA address and data bus errors.
P.11.1 Handling of Extended UPA Address Bus Error
The extended UPA address bus is protected by a parity bit attached to every 8 bits.
When the SPARC64 V processor detects a parity error in the extended UPA address
bus, the processor takes one of the following actions, depending on the
OPSR
setting:
1. Upon detection of the error, the processor enters the CPU fatal error state.
2. Upon detection of the autonomous urgent error
ASI_UGESR.AUG_SDC
, the
processor tries to continue running. However, in some situations, the processor
detects a fatal error and enters the CPU fatal error state.
P.11.2 Handling of Extended UPA Data Bus Error
The extended UPA data bus is protected by a single-bit error correction and double-
bit error detection ECC code attached to every doubleword.
Error marking is applied to the data transmitted through the extended UPA data
bus. The SPARC64 V processor will detect the following three types of errors at the
extended UPA data bus interface:
■
Correctable error (1-bit error)