Analog Devices ADSP-21261 SHARC Hardware Reference Manual page 809

Saturation (ALU saturation mode). In this mode, all positive fixed-point
overflows return the maximum positive fixed-point number
(0x7FFF FFFF), and all negative overflows return the maximum negative
number (0x8000 0000).
Semaphore. This is a flag that can be read and written by any of the pro-
cessors sharing the resource. Semaphores can be used in multiprocessor
systems to allow the processors to share resources such as memory or I/O.
The value of the semaphore tells the processor when it can access the
resource. Semaphores are also useful for synchronizing the tasks being per-
formed by different processors in a multiprocessing system.
Serial ports. The DSP has six synchronous serial ports that provide an
inexpensive interface to a wide variety of digital and mixed-signal periph-
eral devices.
SHARC. This is an acronym for Super Harvard Architecture. This DSP
architecture balances a high performance processor core with high perfor-
mance buses (PM, DM, I/O).
Shifter. This part of a processing element completes logical shifts, arith-
metic shifts, bit manipulation, field deposit, and field extraction
operations on 32-bit operands. Also, the Shifter can derive exponents.
SMUL, Saturation on multiplication. See Multiplier on page G-7.
S/PDIF. (Sony/Philips Digital InterFace) A serial interface for transferring
digital audio between devices such as CD and DVD players and amplifi-
ers. S/PDIF is the consumer version of the AES/EBU interface and uses
unbalanced 75 ohm coaxial cable with RCA or BNC connectors.
SST, Saturation on store. See Multiplier on page G-7.
Subroutines. The processor temporarily interrupts sequential flow to exe-
cute instructions from another part of program memory.
TADD, TDM address. See Multichannel Mode on page G-7.
ADSP-2126x SHARC Processor Core Manual G-9