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PTM1300

Programmable Media Processor

Philips Electronics 

ON-CHIP I/O AND COPROCESSING UNITS

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

treams from an off-chip source into main memory. It accepts signals

from any CCIR656-compliant device that outputs eight-bit parallel,

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

era, digital video decoder, 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 also be programmed to perform on-the-fly 2X hori-

zontal resolution subsampling enabling high-resolution images (720

pixels/line) to be converted to 360 pixels/line without loading the

CPU. When low resolution video is desirable, subsampling during

data capture reduces initial storage and bus bandwidth requirements.

The VI unit can also receive raw data and unidirectional messages

from another TM-1300 video out port.

Video output—The video out (VO) 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 bytes from the

separate Y, U, and V planes stored in SDRAM.

While generating the multiplexed stream, the VO unit can perform

programmed processing tasks, including horizontal 2X upscaling to

convert from CIF/SIF to CCIR 601 resolution. For simultaneous dis-

play of graphics and live video, the VO unit can perform 129-level

UME8UU: SUM OF ABSOLUTE VALUES

OF UNSIGNED 8-BIT DIFFERENCES

SOURCE REGISTER 1

31

0

SOURCE REGISTER 2

31

0

AB C D

EF

GH

|A-E| + |B-F| + |C-G| + |D-H|

DSPALU

FUNCTIONAL

UNIT

31

RESULT

0

DESTINATION

REGISTER

SPECIAL MULTIMEDIA OPERATIONS

The ume8uu operation, commonly used for motion estimation in

video compression, implements 11 simple operations in one

TriMedia special op.

alpha blending to generate sophisticated graphics overlays of arbitrary

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

frame synchronization, programmable YUV output clipping are also

supported. The VO unit can also be used to pass raw data and unidi-

rectional messages between TriMedia processors.

The VO unit can either supply or receive video clock and/or synchro-

nizing signals from the external interface. Clock and timing registers

can be precisely controlled through programmable registers. Program-

mable interrupts and dual buffers facilitate continuous data streaming

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

by the VO unit.

Audio input and output—The audio input (AI) and audio output

(AO) units provide all signals needed to read and write digital audio

datastreams to/from most high-quality, low-cost serial audio oversam-

pling A/D and D/A converters and codecs. Both units connect to off-

chip stereo converters through flexible bit-serial interfaces.

The AI and AO units are highly programmable providing tremendous

flexibility in handling custom datastreams, adapting to custom proto-

cols, and upgrading to future audio standards. Driven by TM-1300,

the programmable audio sampling clock system supports a variety of

sample rates with fine-grain resolution enabling audio and video syn-

chronization in even the most complex multimedia applications.

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