Panasonic KX-T7456 - Digital 24 Button Speakerphone Display, Specifications

Page: 22 / 59

5) IC1 (GATE ARRAY) DPITS Interface
DPITS Layer 1 interface. DR [1:0] is receiving input and DX [1:0] is transmitting output.
Layer 1 is the transmission method of Ping-Pong type which is AMI encoded. “SYNC/MAM/C/D/
B1/B2/P” data is received in the first half at 125us/frame. After 1 bit time has passed since
receiving P data, “SYNC/MAM/C/D/B1/B2/P” is transmitted. 1 bit time is 512kHz. 7-bit time idle
term comes after receiving P data.
6) PCM interface (between IC1 and IC2)
PCM interface consists of following 4 terminals.
The first PCM data is output from TXD at the positive edge of -FSYNC. The second data and the
followings are output at the positive edge of BCLK. After all data of 8 bit are output, the last data
is kept until the positive edge of next -FSYNC. The positive edge of BCLK should be within ±
100ns from the positive edge of -FSYNC.
The PCM data input from RXD is sampled at the negative edge of BCLK inside LSI. The
sampling of the first data is performed between the positive edge of -FSYNC and the first
negative edge of BCLK. After completing the sampling of all data of 8 bit, this sampling pauses
until the next positive edge of -FSYNC.
22