Clocking Options; Frame Sync Options - Analog Devices SHARC ADSP-214 Series Hardware Reference Manual

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Operation Modes

The serial port can automatically select some words for particular channels

while ignoring others. Up to 128 channels are available for transmitting or

receiving or both. Each SPORT can receive or transmit data selectively

from any of the 128 channels.

Data companding and DMA transfers can also be used in multichannel

mode on channel A. Channel B can also be used in multichannel mode,

but companding is not available on this channel.

Although the eight SPORTs are programmable for data direction in the

standard mode of operation, their programmability is restricted for multi-

channel operations. The following points summarize these limitations:

1. The primary A channels of SPORT1, 3, 5, and 7 are capable of

expansion only, and the primary A channels of SPORT0, 2, 4, and

6 are capable of compression only.

2. Receive comparison is not supported.

Clocking Options

In multichannel mode, the serial ports can either accept an external serial

clock or generate it internally. The

determines the selection of these options. For internally-generated serial

Finally, programs can select whether the serial clock rising edge is used for

sampling or driving serial data and/or frame syncs. This selection is per-

formed using the

In previous SHARC processors, multichannel mode required a SPORT

pair. This pair was needed to route the

frame sync to the odd SPORT. The pair itself interconnect the

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ADSP-214xx SHARC Processor Hardware Reference

on the even SPORT and the

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