Zilog ZUSBOPTS Manual do Utilizador descarregar pdf (Página 489)

UM017105-0511 Glossary

Zilog Developer Studio II – ZNEO™

User Manual

461

CPU. Abbreviation for Central Processing Unit. 1. The portion of a computer that includes circuits control-

ling the interpretation and execution of instructions. 2. The portion of a computer that executes pro-

grammed instructions, performs arithmetic and logical operations on data, and controls input/output

functions.

debug. To detect, trace, and eliminate mistakes.

DI. Disable interrupt.

EI. Enable interrupt.

emulation. The process of duplicating the characteristics of one product or part using another medium. For

example, an In-Circuit Emulator (ICE) module duplicates the behavior of the chip it emulates, in the circuit

being tested.

emulator. An emulation device.

EOF. End of file—when all records in a file are processed, the computer encounters an end-of-file condi-

tion.

EPROM. Erasable Programmable Read-Only Memory. An EPROM can be erased by exposure to ultravio-

let light.

EQ. A Boolean operator meaning Equal to.

escape sequence. A special escape command is entered as three plus symbols (+++). placing the modem

in command mode, and interrupting user data transmission. However, the escape sequence does not termi-

nate the data connection. Command mode allows the entering of commands while the connection is main-

tained.

F. Falling Edge.

Fast Fourier Transform. An algorithm for computing the Fourier transform of a set of discrete data val-

ues. Given a finite set of data points—for example, a periodic sampling taken from a real-world signal—

the FFT expresses the data in terms of its component frequencies. It also solves the essentially identical

inverse problem of reconstructing a signal from the frequency data.

FFT. See Fast Fourier Transform.

filter. A process for removing information content, such as high or low frequencies.

flag. In data transmission or processing, an indicator, such as a signal, symbol, character, or digit, used for

identification. A flag may be a byte, word, mark, group mark, or letter that signals the occurrence of some

condition or event, such as the end of a word, block, or message.

frequency. For a periodic function, the number of cycles or events per unit time.

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Zilog ZUSBOPTS Manual do Utilizador Página 489