TM-1100 Просмотр технического описания (PDF) - Philips Electronics

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TM-1100

Programmable Media Processor

Philips Electronics 

output. Eight-bit mono and stereo and 16-bit mono and stereo PC

standard memory data formats are supported. The AO unit can be

used to control highly integrated PC codecs.

Driven by TM-1100, the programmable audio sampling clock sup-

ports rates from 1 Hz to 100 KHz. High resolution of .001 Hz gives

programmers subtle control over sampling frequency enabling audio

and video synchronization in even the most complex configurations.

Image coprocessor — The image coprocessor (ICP) offloads the

TriMedia CPU of several image processing and manipulation tasks

such as copying an image from SDRAM to a host’s video frame buffer.

The ICP can operate as either a memory-to-memory or a memory-to-

PCI coprocessor device. In memory-to-memory mode, the ICP can

perform horizontal or vertical image filtering and scaling. In memory-

to-PCI modes, it can perform horizontal scaling and filtering followed

by YUV to RGB color-space conversion for screen display.

The ICP also provides display support for live video in overlapping

windows. The number and sizes of windows processed are limited only

by available bandwidth. The final resampled and converted image pix-

els are transmitted over the PCI/XIO bus to an optional off-chip

graphics card/frame buffer.

Variable length decoder — TM-1100’s variable length decoder

(VLD) unit offloads the CPU of decoding Huffman-encoded video

datastreams such as MPEG-1 and MPEG-2. It reads video streams

from SDRAM and outputs a decoded stream optimized for MPEG-2

decompression software. This minimizes communications with the

CPU where other portions of MPEG processing are performed.

DVD descrambler — The TM-1100 processor’s digital versatile disc

descrambler unit provides DVD authentication and descrambling

functions internally. These features enables developers to add low-cost,

flexible DVD-video playback functions in PC and standalone applica-

tions with a minimum of effort.

I2C interface — TM-1100’s I2C interface unit provides an external

I2C or compatible interface for use in hardware or software mode. In

hardware mode, it can be used to connect and control a variety of I2C

multimedia devices. This allows TM-1100 to configure and inspect

status of peripheral video devices such as digital decoders and encoders,

digital cameras, parallel I/O expanders and more.

I2C software operation mode enables full control of the I2C interface

through software. The I2C interface is also used to read the boot pro-

gram from an off-chip EEPROM.

Synchronous serial interface — TM-1100’s synchronous serial

interface (SSI) unit provides serial access for a variety of multimedia

applications, such as video phones or videoconferencing, and for gen-

eral data communications in PC-based systems. The SSI unit contains

all the buffers and logic necessary to interface with simple analog

modem front ends. When used with the TriMedia V.34 software

library, the SSI unit provides fully V.34-compliant modem capability.

Alternatively, it can be connected to an ISDN interface chip to pro-

vide advanced digital modem capabilities.

Timers — The TM-1100 provides four general purpose timers useful

for counting/timing events such as CPU clock cycles, data /instruction

breakpoints, cache tracing, audio/video clocks, and more. Three timers

are available to programmers, the fourth is reserved for system software.

Each timer has a value that can be continuously inspected as needed

for an application and an associated modulus that can be used to gen-

erate an interrupt when the timer’s value reaches the modulus.

High-speed PCI/XIO bus interface — TM-1100’s PCI/XIO inter-

face unit connects the CPU and on-chip I/O and coprocessing units

to a PCI/XIO bus. In embedded applications where TM-1100 is the

main processor, this interface enables the TM-1100 to access off-chip

devices that implement functions not provided by on-chip peripherals.

In PC-based applications, the PCI/XIO interface connects TM-1100

to a standard PCI bus, allowing it to be placed directly on the PC

mainboard or on a plug-in card. For low-cost standalone systems, XIO

allows glueless connection of 8-bit x86 or 68K peripheral devices such

as ROM, Flash, EEPROM, UARTs, etc.

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