PR31700 datasheet(21/36 Pages) PHILIPS

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Philips Semiconductors

Preliminary specification

PR31700

32-bit RISC microprocessor

1998 May 13

PERIPHERAL FUNCTIONS

CLOCK GENERATOR

The PR31700 uses an internal PLL and an external crystal oscillator

to generate a clock with eight times the input clock frequency. The

PLL oscillation can be halted externally to reduce power dissipation.

WRITE BUFFER

The PR31700 incorporates a four-stage write buffer.

BUS INTERFACE UNIT (BIU) MODULE

The PR31700 has a Bus Interface Unit with the following features.

• supports 2 Banks of SDRAM and/or DRAM / HDRAM

– 8-bit or 16-bit SDRAM configuration

– 16-bit or 32-bit DRAM configuration

– 16-bit or 32-bit HDRAM configuration

– 4 Mbit, 16 Mbit and 64 Mbit parts supported

– page mode reads and writes supported

– independent refresh counters for each bank

– self refreshing parts supported to retain memory when

system is powered down

• 4 general purpose chip selects (CS3*–CS0*)

– 16-bit or 32-bit ports

– programmable wait states

– read page mode

• 4 general purpose chip selects (MCS3*–MCS0*)

– 16-bit ports

– programmable wait states

– read page mode

• 2 full PCMCIA slots

– 16-bit ports

– IORD and IOWR provided to support I/O cards

– WAIT signal supported

SYSTEM INTERFACE UNIT (SIU) MODULE

The PR31700 has a System Interface Unit with the following

features.

• multi-channel 32-bit DMA controller

• independent DMA controller for video, SIB to/from BETTY

audio/telecom codecs, high-speed serial port, IR, UART, and

general purpose UART

• address decoding for the internal registers

CLOCK MODULE

The PR31700 has a Clock Module with the following features.

• The PR31700 supports system-wide single crystal

configuration, besides the 32 kHz RTC XTAL (reduces cost,

power, and board space)

• common crystal rate divided to generate clock for CPU,

video, sound, telecom, UARTs, etc.

• independent enabling or disabling of individual clocks under

software control, for power management

CONCENTRATION HIGHWAY INTERFACE (CHI) MODULE

The PR31700 has a CHI Module with the following features.

• high-speed serial Concentration Highway Interface (CHI)

contains logic for interfacing to external full-duplex serial

time-division-multiplexed (TDM) communication peripherals

• supports ISDN line interface chips and other PCM/TDM

serial devices

• CHI interface is programmable (number of channels, frame

rate, bit rate, etc.) to provide support for a variety of

formats

• supports data rates up to 4.096 Mbps

• independent DMA support for CHI receive and transmit

INTERRUPT MODULE

The PR31700 has an Interrupt Module with the following features.

• contains logic for individually enabling, reading, and clearing

all PR31700 interrupt sources

• interrupts generated from internal PR31700 modules or from

edge transitions on external signal pins

IO MODULE

The PR31700 has an IO Module with the following features.

• contains support for reading and writing the 7 bi-directional

general purpose IO pins and the 32 bi-directional

multi-function IO pins

• each IO port can generate a separate positive and negative

edge interrupt

• independently configurable IO ports allow the PR31700 to

support a flexible and wide range of system applications and

configurations

IR MODULE

The PR31700 has an IR Module with the following features.

• IR consumer mode

– allows control of consumer electronic devices such as

stereos, TVs, VCRs, etc.

– programmable pulse parameters

– external analog LED circuitry

• IRDA communication mode

– not compatible with General Magic Cap Devices

– allows communication with other IRDA devices such as

FAX machines, copiers, printers, etc.

– supported by the UART module within the PR31700

– external analog receiver preamp and LED circuitry

– data rate = up to 115 kbps at 1 meter

• IR FSK communication mode

– compatible with GeneraI Magic Cap Devices

– supported by the UART module within the PR31700

– external analog IR chip(s) perform frequency modulation to

generate the desired IR communication mode protocol

– data rate = up to 36000 bps at 3 meters

• carrier detect state machine

– periodically enables IR receiver to check if a valid carrier

is present

PR31700 Datasheet(PDF) 21 Page - NXP Semiconductors

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