Datasheet TL855 Datasheet (TERAL)

GLOBAL AND SCALABLE ARCHITECTURE

The TL855 is an integrated MPEG-2 MP@HL 4:2:2 video decoder, display processor and graphics accelerator for professional

advanced Digital Television. It complies with all ATSC/ARIB/DVB-HD/DIRECTV

®

-HD recommended performance metrics and

supports direct video output to a variety of display types. It performs professional quality decoding (4:2:2) of a single HD program

(MP@HL). An integrated graphics accelerator renders text and graphics to an independent on-screen display (OSD) bitmap.

The IC buffers the audio data, allowing the use of a standard Dolby Digital (AC-3) decoder chip or software on a host CPU for

audio decoding.

The TL855 accepts MPEG compressed data encoded in the 4:2:2 format. Four Y, two Cb and two Cr values are generated for

every four pixels decoded. Compared to 4:2:0 decoding, 4:2:2 decoding generates two extra chroma components requiring a

considerable increase in performance over 4:2:0 consumer decoders. Therefore

the TL855 memory interface, the MPEG decoder core engine and the display

controller must be highly tuned for 4:2:2 processing. The memory interface has

twice the buffering of conventional 4:2:0 decoders to handle the extra amount of

chroma component during writes and reads. The MPEG decoder engine decodes

the extra chroma values. The display controller accepts 4:2:2 data from the SDRAM

as decoded by the MPEG decoder engine, then displays this higher quality video

on the screen.

The TL855 is able to process all ATSC, DVB-HD and ARIB formats (and other

worldwide and proprietary decoding such as DIRECTV) in high quality 4:2:2 video

and then display the resultant video at this quality. In addition to the MPEG-2 4:2:2 decode, the TL850 performs format conversion

from any ATSC format to any other ATSC format (including many non-standard resolutions). An on-chip 2D graphics accelerator

provides TV-centric graphics and OSD to complement the video quality. A PCI interface allows ease of interfacing to a variety of

common off-the-shelf components suitable for professional systems. In addition to these functions the TL855 can be programmed

into a 4:2:0 mode of operation.

All Format video/graphics solution for studio or professional quality equipment

TL855

Professional Digital TV Decoder

5.1 Channel

5.1 Channel

MPEG Transport Data

QPSK, QAM or

VSB Receiver

PCI Bus

32

64

8

16MB - 64MB

SDRAM

TL855

RGB or
YPbPr
and Sync

I

2

S

Digital RF

Studio Source

Audio Decoder

HDTV

Audio DACs

!

IEC958

TL855 SYSTEM DIAGRAM

integrated circuits

Copyright 2000. TeraLogic, Inc. All rights reserved worldwide. TeraLogic and the TeraLogic logo are registered trademarks of TeraLogic, Inc. Janus is a
trademark of TeraLogic, Inc. All other trademarks are properties of their respective owners and are acknowledged. 11/00 - 5K

TeraLogic, Inc. 1240 Villa Street Mountain View CA 94041
tel [phone] fax [phone] www.teralogic.tv

circuits

APPLICATIONS

• Professional/Broadcast STB

• Professional video decoding/editing systems

• Ad Insertion Systems

• Digital Cinema

SUPPORTING TERALOGIC PRODUCTS

• Cougar Pro Development Platform

• TL81x STB/PVR Controller ICs

PROGRAMMABLE TRANSPORT
DEMULTIPLEXER

• ATSC/DVB-HD/DIRECTV-HD compliant

• Glueless interface to most front-end ICs

• Maximum input bit rate of 135 Mbits/sec

supported

HIGH-PERFORMANCE 4:2:2 DIGITAL
VIDEO DECODER

• MP@HL MPEG2 4:2:2 decoder

• All ATSC/ARIB/DVB/DIRECTV compliant

decode formats

• Decodes one 4:2:2 HD (MP@HL) stream
at a time

• Decodes and displays HD content in 4:2:2
mode for professional applications

ACCELERATED 2-D GRAPHICS

• Full alpha blend support

• Up to 32 bpp graphics in RGB

MEMORY CONTROLLER

• 64-bit wide SDRAM interface

• Programmable clock generator

• Up to 64 Mbytes addressing range

PCI BUS INTERFACE

• 32-bit interface

• 66 MHz or 33 MHz bus clock

• PCI slave capability supported

• DMA master capability over PCI bus

supported (4:2:0 mode only)

VIDEO DECODE AND DISPLAY
OF 4:2:0 CONTENT

• Supports video decode and display of
4:2:0 content as specified in the TL850
specification.

• Extra features are enabled in this mode
such as extra graphics modes. See the
TL850 product brief for the full list of
features enabled.

TECHNOLOGY

• 2.5-V core, 3.3-V I/O, 0.25-m CMOS

• 348-pin ball grid array package

HIGH-PERFORMANCE DISPLAY
PROCESSOR

• Multiple output display formats supported,
including 1920x1080i, 1280x720p,
704x480p and 704x480i

• Many nonstandard input and output
formats supported

• Up/down conversion of source to selected
display format

• Graphics overlay plane with up to 8-bits
per pixel and global alpha blending

• Analog RGB or YCrCb output for HDTV
display

• Support for SMPTE 274M-, SMPTE 296M-,
SMPTE 293M-, and EIA 770-compatible
tri-level sync on analog output

• 16- or 24-bit digital video output in YCrCb
or RGB mode

AUDIO PROCESSING

• Audio stream play from memory

• Audio mix, cross-fade and attenuate

between sources

• Six-channel audio output

• IEC-958 formatted output supported

• Provides audio rate buffer

• Supports audio and video PTS

synchronization

TL855 Professional Digital TV Decoder

2D Graphics

Memory

PCI Bus

TL855

Memory Controller

PCI Controller

SD/HD

Transport

Stream

Digital HD

Video

Analog HD Out

(RGB/YP

b

P

r

)

Audio Out

(I

2

S and IEC958)

Display Processor

• All formats

• 1080i, 720p, 480p, 480i

Transport
Demultiplexer

• ATSC

• ARIB

• DVB

• DIRECTV

Audio

Processor/

Mixer

32

Digital Video Decoder

• M

P@HL MPEG2 4:2:2 decoder

• Decodes all 18 ATSC formats

• ATSC, DVB, ARIB, DIRECTV
compliant

TL855 BLOCK DIAGRAM