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Glossary–14
21264/EV68A Hardware Reference Manual
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.
receive counter
Counter used to enable the receive flops. It is clocked by the incoming forwarded clock
and reset by the Interface Reset.
receive mux counter
The receive mux counter is preset to a selectable starting point and incremented by the
locally generated forward clock.
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.
reset
An action that causes a logic unit to interrupt the task it is performing and go to its ini-
tialized state.
RISC
Reduced instruction set computing. A computer with an instruction set that is paired
down and reduced in complexity so that most can be performed in a single processor
cycle. High-level compilers synthesize the more complex, least frequently used instruc-
tions by breaking them down into simpler instructions. This approach allows the RISC
architecture to implement a small, hardware-assisted instruction set, thus eliminating
the need for microcode.
ROM
Read-only memory.
RTL
Register-transfer logic.
SAM
Serial access memory.
SBO
Should be one.
SBZ
Should be zero.
scheduling
The process of ordering instruction execution to obtain optimum performance.