PR31500ABC datasheet(5/24 Pages) PHILIPS

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Philips Semiconductors

Preliminary specification

MIPS

PR31500

Poseidon embedded processor

1996 Sep 24

IR Module

• 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

– allows communication with other IRDA devices such as FAX

machines, copiers, printers, etc.

– supported by UART module within PR31500

– external analog receiver preamp and LED circuitry

– data rate = up to 115 Kbps at 1 meter

• IR FSK communication mode

– supported by UART module within PR31500

– 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

Power Module

• power-down modes for individual internal peripheral modules

• serial (SPI port) power supply control interface supported

• power management state machine has 4 states: RUNNING,

DOZING, SLEEP, and COMA

Serial Interconnect Bus (SIB) Module

• PR31500 contains holding and shift registers to support the serial

interface to the UCB1100 and/or other optional codec devices

• interface compatible with slave mode 3 of Crystal CS4216 codec

• synchronous, frame-based protocol

• PR31500 always master source of clock and frame frequency and

phase; programmable clock frequency

• each SIB frame consists of 128 clock cycles, further divided into 2

subframes or words of 64 bits each (supports up to 2 devices

simultaneously)

• independent DMA support for audio receive and transmit, telecom

receive and transmit

• supports 8-bit or 16-bit mono telecom formats

• supports 8-bit or 16-bit mono or stereo audio formats

• independently programmable audio and telecom sample rates

• CPU read/write registers for subframe control and status

System Peripheral Interface (SPI) Module

• provides interface to SPI peripherals and devices

• full-duplex, synchronous serial data transfers (data in, data out,

and clock signals)

• PR31500 supplies dedicated chip select and interrupt for an SPI

interface serial power supply

• 8-bit or 16-bit data word lengths for the SPI interface

• programmable SPI baud rate

Timer Module

• Real Time Clock (RTC) and Timer

• 40-bit counter (30.517 µsec granularity);

maximum uninterrupted time = 388.36 days

• 40-bit alarm register (30.517 µsec granularity)

• 16-bit periodic timer (0.868 µsec granularity);

maximum timeout = 56.8 msec

• interrupts on alarm, timer, and prior to RTC roll-over

UART Module

• 2 independent full-duplex UARTs

• programmable baud rate generator

• UART-A port used for serial control interface to external IR

module

• UART-B port used for general purpose serial control interface

• UART-A and UART-B DMA support for receive and transmit

Video Module

• bit-mapped graphics

• supports monochrome, grey scale, or color modes

• time-based dithering algorithm for grey scale and color modes

• supports multiple screen sizes

• supports split and non-split displays

• variable size and relocatable video buffer

• DMA support for fetching image data from video buffer

Little/Big Endian Configuration

The PR31500 can be configures as a Big Endian or as a Little

Endian processor based on the /LB endian pin at power-up.

The byte ordering is as follows:

LITTLE ENDIAN

BIG ENDIAN

D[31:24]

D[7:0]

D[23:16]

D[15:8]

D[23:16]

D[7:0]

D[31:24]

/CAS3

/CAS0

/CAS2

/CAS1

/CAS2

/CAS0

/CAS3

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