This reference design demonstrates a

complete solution for capture,

demodulation and decoding of ATSC-

compliant DTV signals, and outputting

DTV transport streams over the high

speed IEEE 1394 bus using either

IEEE 1394 or Device Bay connections.

It uses just three core ICs:

the TDA8960 VSB demodulator/decoder

and two IEEE 1394 ICs - a physical layer

controller and A/V link layer controller.

SINGLE-CHIP ATSC

DEMODULATOR/DECODER

•

TDA8960 ATSC-compliant 8-VSB

demodulator and concatenated Trellis

(Viterbi)/Reed-Solomon decoder with

de-interleaver and de-randomizer

•

8-bit MPEG2 transport stream output

•

On-chip digital tuner AGC control

•

Integrated digital Square-Root

Raised-Cosine (half Nyquist) filter with

11.5 % roll-off

•

Feed forward adaptive equalizer

including a Decision Feedback Equalizer

(DFE)

•

Reed-Solomon decoder with internal

convolutional de-interleaving

•

De-randomizer based on ATSC standard

•

Rate 2/3 (rate 1/2 Ungerboeck-code-

based) Trellis (Viterbi) decoder

One of the key chips in the Device Bay module, the TDA8960

accepts 8-VSB modulated signals from the IF block of the tuner

front-end, or alternatively, the VSB IC AGC control output can

be applied directly to the tuner. Adaptive equalization using

the ATSC field sync (trained equalization) and/or the 8-VSB data

itself (blind equalization) is performed via a decision feedback

equalizer (DFE) following internal carrier recovery, half Nyquist

filtering and symbol timing recovery.

Following trellis decoding, the stream is de-interleaved with a

convolutional de-interleaver with on-chip memory. The ATSC-

compliant Reed-Solomon decoder has a length of 207 and can

correct up to 10 bytes. After decoding, the stream is de-randomized

and passed to a FIFO, preventing irregular gaps in the data; this then

outputs an 8-bit MPEG2 transport stream for de-multiplexing.

Philips Semiconductors’ controllers deliver a high-performance,

low-cost, proven IEEE 1394 system solution. Our Physical layer

controllers are fully interoperable with all 1394 link layer controllers

including PCI/OCHI compatible devices, while our Link layer

controllers offer support for MPEG2 and DV data streams, and

IEC61883. Our latest full duplex A/V link layer controller

(PDI1394L21) also supports processor based time stamp handling.

All Philips IEEE 1394 silicon offers bus holder circuits on the

Link/PHY interface, allowing effective node isolation - required in

almost all 1394-enabled equipment. A single capacitor in series with

each Link/PHY interface line provides economical yet highly

effective isolation.

COMPLETE REFERENCE DESIGN FOR A

IEEE 1394/DEVICE BAY ATSC DTV RECEIVER MODULE

PROVEN HIGH PERFORMANCE IEEE 1394 SILICON