dsp56800e Freescale Semiconductor, Inc, dsp56800e Datasheet - Page 694

• Manufacturer Part Number: dsp56800e
• Description: 16-bit Digital Signal Controller Core
• Manufacturer: Freescale Semiconductor, Inc

IEEE
I/O
JTAG
K&R
LIFO
LSB
LSP
MAC
MCU
MIPS
C-4
technologies that increase efficiency and enable higher transmission speeds. Devices based
on iDEN technology typically include multiple functions, such as telephony, paging, and
radio.
Institute of Electrical and Electronics Engineers
A technical professional association that focuses on disseminating information on electrical
and electronics technologies. IEEE’s activities include drafting standards and specifications
for all aspects of electronics and communications.
input/output
I/O refers to any operation, program, or device whose purpose is to enter data into a processor
or to extract data from a processor. The term can also be used to distinguish
non-computational parts of a program from other parts that are strictly computational, or to
distinguish devices or units. For example, a serial port is an I/O unit, whereas an ALU is a
computational unit.
Joint Test Action Group
An industry group that defined the IEEE standard for boundary-scan and test capabilities on
an integrated circuit. The term JTAG is often used to refer to these capabilities, or to the test
access port (TAP) that is used to access this test logic.
Kernighan and Ritchie
This abbreviation refers both to Brian Kernighan and Dennis Ritchie, the authors of The C
Programming Language, and to the book itself. This book is considered to be the definitive
reference text on the C language.
last in, first out
A data structure or device in which data items are removed in the reverse order from that in
which they are added, so the most recently added item is the first one to be removed. The most
common form of a last-in-first-out data structure is a stack. See also FIFO.
least significant bit
The lowest numbered bit in a multi-bit data value; it is almost always bit 0. See also MSB.
least significant portion
In a multi-part value, the portion that occupies the lowest numbered bits. For example, in a
32-bit value that is composed of two 16-bit portions, the least significant portion would be
the portion that occupies bits 15–0. See also MSP.
multiply-accumulate
An operation that multiplies two numbers together and adds the product to a “running total.”
Dedicated hardware to perform multiply-accumulate operations is common in digital signal
controllers because DSC algorithms frequently perform this type of calculation. The term
multiply-accumulate can also function as a verb, and MAC can refer to a unit that performs
multiply-accumulate operations.
microcontroller unit
Similar to a CPU, a microcontroller unit includes not only circuitry to execute instructions,
but also peripheral modules and specialized interfaces. An MCU is typically used in
embedded systems applications, while a CPU is found in general-purpose computers.
million instructions per second
A rough measure of processor performance, measuring the number of instructions that can be
executed in one second. However, some instructions require more or less time than others to
execute, and performance can be limited by other factors, such as memory and I/O speed.
DSP56800E Core Reference Manual
Freescale Semiconductor