Data Types And Companding - Analog Devices SHARC ADSP-214 Series Hardware Reference Manual

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Functional Description

shows a block diagram of a serial port. Setting the

enables the data buffer path, which, once activated, responds by shifting

data in response to a frame sync at the rate of

program must use the correct serial port data buffers, according to the

for the transmission of A and B channel data, or it enables the receive data

buffers for the reception of A and B channel data. Inactive data buffers are

The processor's SPORTs are not UARTs and cannot communicate with

an RS-232 device or any other asynchronous communications protocol.

One way to implement RS-232 compatible communication with the pro-

cessor is to use two of the

transmit signals.

Data Types and Companding

Linear transfers occur in the primary channel, if the channel is active and

companding is not selected for that channel. Companded transfers occur

if the channel is active and companding is selected for that channel. The

multichannel compand select registers,

transmit and receive channels that are companded when multichannel

mode is enabled.

Transmit or receive sign extension is selected by bit 0 of

is set, sign extension occurs on selected channels that do not have

companding selected. If this bit is not set, the word contains zeros in the

MSB positions. Companding is not supported for B channel. For B

channels, transmit or receive sign extension is selected by bit 0 of

The compression for transmission requires a minimum word

length of 8 (

sion may not work correctly.

www.BDTIC.com/ADI

bit enables either the transmit data buffers

pins as asynchronous data receive and

= 8) for proper function. If

ADSP-214xx SHARC Processor Hardware Reference

. An application

< 8 the expan-

, specify the

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