ST5080A datasheet(9/32 Pages) STMICROELECTRONICS

부품명	ST5080A

상세설명	PIAFE PROGRAMMABLE ISDN AUDIO FRONT END

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제조업체	STMICROELECTRONICS [STMicroelectronics]

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output shifts data out from the voice data register

on the rising edges of MCLK. Serial voice data is

shifted into DR input during the same time slot on

the falling edges of MCLK.

DX is in the high impedance Tristate condition

when in the non selected time slots.

Control Interface:

Control information or data is written into or read-

back from PIAFE via the serial control port con-

sisting of control clock CCLK, serial data input CI

and output CO, and Chip Select input, CS-. All

control instructions require 2 bytes as listed in Ta-

ble 1, with the exception of a single byte power-

up/down command.

To shift control data into ST5080A, CCLK must

be pulsed high 8 times while CS- is low. Data on

CI input is shifted into the serial input register on

the rising edge of each CCLK pulse. After all data

is shifted in, the content of the input shift register

is decoded, and may indicate that a 2nd byte of

control data will follow. This second byte may

either be defined by a second byte-wide CS-

pulse or may follow the first contiguously, i.e. it is

not mandatory for CS- to return high in between

the first and second control bytes. At the end of

Figure 2: GCI Interface Frame Structure

Figure 1: Digital Interface Format

ST5080A

9/32

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