TP11368_11 datasheet(6/20 Pages) TI1

номер детали	TP11368

подробное описание детали	Octal Adaptive Differential PCM Processor

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производитель	TI1 [Texas Instruments]

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Functional Description (Continued)

by a receive (decoder) operation. For the encoding opera-

tion, the PCM data is stored in the 8-bit shift register at the

falling edge of CE while TRB is high. The TP11368 pro-

cesses the data within 123 CLK periods during the following

cycle of CE. The encoded ADPCM data is loaded into the

5-bit parallel-to-serial output register with the falling edge of

CE. The MSB data is shifted out first with the leading edge of

CE, and subsequent data is shifted out with the rising edge

of ASCK. For the decoding operation, the ADPCM data is

latched and transferred to the core at the falling edge of CE

while TRB is low. The data is processed within 123 CLK pe-

riods and the decoded 8-bit PCM data is shifted out with the

MSB first.

PSCK and ASCK are the clocks for the PCM and ADPCM

data streams, respectively. They must be high during the

transition of CE. Note that PSCK and ASCK are shown as

gated clocks as an option to conserve power. PSCK and

ASCK need only be valid while CE is high.

DS012902-5

FIGURE 3. Serial Output Structure

5

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