Serial Port To Codec Interface - Analog Devices adsp-2100 Manual

Note: The proper loading sequence for boot data must be followed (i.e. the
order in which the host passes bytes to the ADSP-21xx). This sequence is
described in the Chapter 10, "Memory Interface." To create a file for
booting, use the PROM Splitter utility of the ADSP-2100 Family
Development Software. The PROM Splitter automatically organizes the
bytes in the proper order for booting.
13.3

SERIAL PORT TO CODEC INTERFACE

A codec (COder/DECoder) incorporates analog-to-digital conversion,
digital-to-analog conversion, and filtering in one device. The codec shown
in this example also performs pulse-code modulation (PCM) encoding and
decoding according to the CCITT µ-law standard. PCM compresses digital
data so that fewer bits are needed to store the same information. The
ADSP-21xx serial ports have both µ-law and A-law companding
(compressing/expanding) capability.
In the example described here, a codec converts its analog input to digital
data, compresses it and sends it serially to the SPORT on an ADSP-21xx
processor. At the same time, the processor sends compressed serial data
via the SPORT to the codec, which expands the data and converts the
result to an analog signal.
Hardware Examples 13
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