KX-TDA100DUP (serv.man3) - Panasonic PBX Service Manual Supplement (repair manual). Page 8

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• CODEC interface

Can connect up to 12 Silicon Labs Si32261, and is intended for enabling the line control.

• GPIO interface

Parallel interface that is arbitrarily programmable bidirectionally.

Silicon Labs Si32261 CODEC is installed. The analogue features such as BN, frequency characteristic, volume level, sidetone are
configured by PLD CODEC interface DCLK, CS, DOUT, DIN. Also, it converts A/D to D/A, and 4-line-analogue signal to PCM code
in G.711 format.