PCF5083HSLASH001SLASHF2 datasheet(12/136 Pages) PHILIPS

12 / 136 page

1996 Oct 29

Philips Semiconductors

Objective speciﬁcation

GSM signal processing IC

PCF5083

• Equalization for normal and synchronization bursts

• Power measurement of serving and neighbouring cells

• Tone and side-tone generation.

2.5 kbytes of RAM are free for downloading of additional

software modules e.g. rate adaptation, handsfree, voice

recognition.

The DSP communicates via two serial ports to the

baseband interface IC and to the IOM®-2 Interface and

Voice Port for speech and data transmission. For

command and data transfer it is connected to a

microcontroller via its 8-bit Host Port and the

68000 compatible Host Interface. The I/O port of the DSP

core provides four general purpose I/O lines. Some of the

port lines are used as dedicated control signals.

The Timer and Interface functions include a GSM specific

hardware timer and a couple of interface functions which

simplify system design and keep the chip count to a

minimum.

The Timing Generator provides the TDMA burst timing and

power on/off signals for the RF transmitter, RF receiver,

synthesizer, DSP and baseband interface IC. The timing

signals can be programmed with an accuracy of a

quarterbit (1

⁄500 TDMA frame). Their output polarity is

programmable.

The RF-IC Interface is used to program the RF ICs and the

synthesizer. It is compatible with the Philips ‘Three Wire

Bus’ and other standards. The bus consists of clock, data

and several enable lines to transfer data between the

PCF5083 and the connected devices. ICs of one family

share the same enable line. Their unique address is a part

of the data stream. ICs of different families use separate

enable lines.

The PCF5083 includes an IOM®-2 Interface to connect

external accessories e.g. a handsfree set. It may be used

as a software download interface and provides access for

the Digital Audio Interface during Type Approval.

The Audio Interface provides the connection between a

local codec, the IOM®-2 Bus and the DSP.

The ON/OFF Logic performs the basic power-up and

power-down switching function for the whole mobile. It

controls the supply voltage switches for the terminal. The

on/off conditions are controlled via the operators

keyboard, a low voltage battery indication circuit, the

Watchdog Timer or an auxiliary switch on input for general

purpose use.

The man-machine interface section includes a dedicated

RS232 interface and generates a 13 MHz clock for the

keyboard and card reader controller. If this controller is

inactive, the clock is stopped to save power. If the

controller requests service, the clock is switched on again.

The PCF5083 includes a 6-bit general purpose parallel

port to control system functions. One bit of the port is used

on-chip to provide a reset signal for the DSP core.

The PCF5083 is accessed via its 8-bit, 68000 compatible

Host Interface. Separate chip enable lines for the DSP and

the Timer core are available. The DSP core provides a

signal to be used as DTACK for maximum speed

operation. Three interrupt lines are provided for the

microcontroller.

The PCF5083 requires two clock signals. The 13 MHz

main clock is used internally to generate the TDMA timing

and as a reference clock for the on-chip PLL. A second

clock of 32.768 kHz is used for a real time clock/calendar,

a Watchdog Timer and to provide timing in a power

reducing Sleep mode. During this mode TDMA timing is

maintained with slow running, high accuracy counters,

while all timing signals are kept inactive to save power.

The on-chip PLL generates three clocks (13, 39 and

52 MHz) which are manipulated to generate the internal

DSP clock (19.5 MHz), a 19.5 MHz output (CLK20M) and

a 26 MHz output (CLK26M, only version 3) used by the

microcontroller and other system components. The

13 MHz PLL output is used by the Timing Generator in

addition to being fed back to the PLL. The nominal duty

cycle of the PLL outputs is 50%, independent of the

reference clock characteristics. The PLL clock outputs

may be used for all system components requiring a

symmetric input clock therefore leading to reduced

tolerance requirements for the duty cycle of the reference

clock.

Other ICs of the Philips second generation GSM chipset

are:

• P90CL301: 16-bit 68000 compatible microcontroller

• TDA8005: SIM/MMI-Controller

• PCF5072: Baseband Interface and Audio Codec

• SA1638: IF processing IC

• SA1620: RF processing IC (900 MHz)

• UMA1019: Synthesizer

• PCF5075: Power amplifier controller

• BGY20x: UHF Power Amplifier Module family.

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