Glossary
B-4
J
JTAG:
Joint Test Action Group. The Joint Test Action Group was formed in
1985 to develop economical test methodologies for systems designed
around complex integrated circuits and assembled with surface-mount
technologies. The group drafted a standard that was subsequently
adopted by IEEE as IEEE Standard 1149.1-1990, “IEEE Standard Test
Access Port and Boundary-Scan Architecture”.
K
kernel:
The core portion of the operating system that manages memory,
files, and peripheral devices. It also starts applications, allocates re-
sources, and maintains time and date.
kHz:
Kilohertz.
L
luminance:
The NTSC or PAL video signal contains two pieces that make
up what you see on the screen: the black and white part and the color part
(chrominance). The black and white part is called the luminance and is
also called luma. See also
chrominance.
M
memory map:
A graphical representation of a computer system’s memory,
showing the locations of program space, data space, reserved space,
and other memory-resident elements.
MHz:
Megahertz.
mini-DIN connector:
A connector that is similar to a DIN connector (only
much smaller) using multiple pins in accordance with the German nation-
al standard organization (Deutsch Industrie Norm - DIN). Two 8-pin mini-
DIN connectors are used on the SDB to connect input/output peripher-
als.
motherboard:
The main circuit board that contains the processor, main
memory, circuitry, bus controller, connectors, and primary components
of the computer. The TMS320C8x SDB is connected to the motherboard
via the PCI local bus. Depending upon the computer system design,
daughter boards, expansion boards, input/output boards, other boards,
or additional memory may also be connected to the motherboard using
the bus controller.