1997 Nov 19

9

Philips Semiconductors

Objective specification

DECT baseband controller

PCD5095

6

FUNCTIONAL DESCRIPTION

The PCD509x is a family of single-chip controllers,

designed for use in Digital Enhanced Cordless

Telecommunications systems (DECT). The family is

designed for minimum component-count and minimum

power consumption. All controllers include an embedded

interface. The Philips DECT RF interface is implemented.

The Burst Mode Logic (BML) performs the time-critical

MAC layer functions for applications in DECT handsets

and base stations. The ADPCM transcoding is in

compliance with the CCITT recommendation G.721 and

includes receive and transmit filters.

The PCD5095 is designed for business systems, PABX

and WLL. Two modes can be selected: bidirectional

conversion of three ADPCM channels based on linear

PCM format, the second mode copies four ADPCM

buffers and vice versa. In both modes the DSP controls

the bidirectional data flow from the radio interface and the

described in the

“PCD5095 DSP user manual”. Basically

the System Data RAM (SDR), the shared memory with

inbound and outbound speech buffers, is the interface to

the DSP and to the radio. Depending on the selected

mode the DSP processes the data stored in the SDR. The

speech buffers are 40 bytes long and each buffer can

hold 80 ADPCM-coded speech samples.

Fig.3 PCD5095 for PABX.

handbook, full pagewidth

HANDSET

(PCD5091)

RF

PCD5095

DECT CORDLESS PABX

IOM-2

INTERFACE

RF

PABX

MGL189

HANDSET

(PCD5091)

RF