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TM-1100

Programmable Media Processor

Philips Electronics 

On-chip

multimedia I/O

& coprocessing

units

To streamline data throughput,

TM-1100’s independent DMA-driven

peripheral units manage I/O,

format video, audio, graphics, and

communications datastreams,

and perform operations specific

to key multimedia algorithms.

MULTIMEDIA I/O AND COPROCESSING UNITS

Video input — The video input (VI) unit reads digital video data-

streams from an off-chip source into main memory. The VI unit

accepts input from CCIR656-compliant devices that output 8-bit

parallel, 4:2:2 YUV time-multiplexed video data, such as digital video

cameras, digital video decoders, or devices connected through ECL-

level converters to the standard D1 parallel interface. After input, YUV

data is demultiplexed, subsampled as needed, and written to SDRAM.

The VI unit can be programmed to perform on-the-fly 2X hori-

zontal resolution subsampling. This enables high-resolution images

(640- or 720-pixels/line) to be captured and converted to 320- or

360-pixels/line without burdening the CPU. When lower resolution

video is eventually desirable, performing subsampling during data cap-

ture reduces initial storage and bus bandwidth requirements. The VI

unit can receive raw data and unidirectional messages from another

TM-1100’s video out port.

Enhanced video output — The enhanced video out (EVO) unit

outputs a digital YUV datastream to off-chip video subsystems such as

a digital video encoder chip, digital video recorder, or other CCIR656-

compatible device. The output signal is generated by gathering bits

from the separate Y, U, and V data structures in SDRAM.

The EVO unit can either supply or receive video clock and/or

synchronizing signals from the external interface. Clock and timing

registers can be precisely controlled through programmable registers.

Programmable interrupts and dual buffers facilitate continuous data

streaming by allowing the CPU to set up a buffer while another is

being emptied by the EVO unit.

While generating the multiplexed stream, the EVO unit can perform

programmed tasks, including optional horizontal 2X upscaling to con-

vert from CIF/SIF to CCIR 601 resolution. For simultaneous display

of graphics and live video, the EVO unit can perform 129-level alpha

blending to generate sophisticated graphics overlays of arbitrary size

and position within the output image. Chroma keying, genlock frame

synchronization, and programmable YUV output clipping are also

supported. The EVO unit can also pass raw data and unidirectional

messages to another TriMedia processor.

Audio input and audio output — Together the audio input (AI)

and audio output (AO) units provide all signals needed to interface to

most high-quality, low-cost serial audio D/A and A/D converters. Both

audio units are highly programmable, providing tremendous flexibility

in developing custom datastream handling, adapting to custom proto-

cols, and upgrading to support future audio standards.

The audio peripheral units connect to off-chip stereo converters

through flexible bit-serial interfaces. The AI unit supports one or two

channels of audio input; the AO unit delivers up to eight channels of

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