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Alpha 21264/EV67 Hardware Reference Manual
Glossary–17
UNPREDICTABLE
Results or occurrences that do not disrupt the basic operation of the processor; the pro-
cessor continues to execute instructions in its normal manner. Privileged or unprivi-
leged software can trigger UNPREDICTABLE results or occurrences. (This meaning
only applies when the word is written in all upper case.)
UVPROM
Ultraviolet (erasable) programmable read-only memory.
VAF
See victim address file.
valid
Allocated. Valid cache blocks have been loaded with data and may return cache hits
when accessed.
VDF
See victim data file.
VHSIC
Very-high-speed integrated circuit.
victim
Used in reference to a cache block in the cache of a system bus node. The cache block
is valid but is about to be replaced due to a cache block resource conflict.
victim address file
The victim address file and the victim data file, together, form an 8-entry buffer used to
hold information for transactions to the Bcache and main memory.
victim data file
The victim address file and the victim data file, together, form an 8-entry buffer used to
hold information for transactions to the Bcache and main memory.
virtual cache
A cache that is addressed with virtual addresses. The tag of the cache is a virtual
address. This process allows direct addressing of the cache without having to go
through the translation buffer making cache hit times faster.
VLSI
Very-large-scale integration.
VPC
Virtual program counter.
VRAM
Video random-access memory.