Analog Devices SHARC ADSP-214 Series Hardware Reference Manual page 494

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Operation Modes

field is a read-only status indicator. The

as each channel is serviced.

Active Channel Selection Registers

Specific channels can be individually enabled or disabled to select the

words that are received and transmitted during multichannel communica-

tions. Data words from the enabled channels are received or transmitted,

while disabled channel words are ignored. Up to 128 channels are avail-

able for transmitting and receiving.

The multichannel selection registers enable and disable individual chan-

nels. The registers for each serial port are shown

Each of the four multichannel enable and compand select registers are 32

bits in length. These registers provide channel selection for 128 (32 bits x

4 channels = 128) channels. Setting a bit enables that channel so that the

serial port selects its word from the multiple-word block of data (for either

receive or transmit). For example, setting bit 0 for TX SPORT0 and TX

nel 12, and so on. Setting bit 0 for TX SPORT0 and TX SPORT7

Companding Selection

Companding may be selected on a per-channel basis. Setting a bit to 1 in

any of the multichannel registers (

data be companded for that channel. A-law or μ-law companding can be

selected using the

5 and 7 expand selected incoming time slot data, while SPORTA0, 2, 4

and 6 can compress the data.

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) selects channel 0, setting bit 12 selects chan-

) selects channel 32, setting bit 12 selects channel 44,

ADSP-214xx SHARC Processor Hardware Reference

bits increment modulo

in"Serial Port Registers"

) specifies that the

control registers. SPORTA1, 3,

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