DEC 4000 AXP Service Manual page 227

read-merge
Indicates that an item is read from a responder/bystander, and new data is
then added to the returned read data. This occurs when a masked write cycle
is requested by the processor or when unmasked cycles occur and the CPU is
configured to allocate on full block write misses.
read-modify-write operation
A hardware operation that involves the reading, modifying, and writing of a piece
of data in main memory as a single, uninterruptible operation.
read stream buffers
Arrangement whereby each memory module independently prefetches DRAM
data prior to an actual read request for that data. Reduces average memory
latency while improving total memory bandwidth.
read-write ordering
Refers to the order in which memory on one CPU becomes visible to an execution
agent (a different CPU or device within a tightly coupled system).
redundant
Describes duplicate or extra computing components that protect a computing
system from failure.
register
A temporary storage or control location in hardware logic.
reliability
The probability a device or system will not fail to perform its intended functions
during a specified time interval when operated under stated conditions.
removable-media compartment
Compartment in the enclosure that houses removable media.
responder
A system bus node that accepts or supplies data in response to an address and
command from a system bus commander. Also called a responder node.
RISC
Reduced instruction set computer. A computer with an instruction set that is
reduced in complexity.
Glossary–17