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ADV601

–21–

REV. 0

Video Interface

The ADV601 video interface supports a wide range of compo-

nent digital video (D1) interfaces in both compression (input)

and decompression (output) modes. These digital video inter-

faces include support for the following:

• Philips 4:2:2

• Multiplexed Philips 4:2:2

• CCIR-656/SMPTE125M - international standard

• Closed Captioning and VITC decode and encode

Video interface master and slave modes allow for the generation

or receiving of synchronization and blanking signals. Definitions

for the different formats can be found later in this section. For

recommended connections to popular video decoders and

encoders, see the Connecting The ADV601 To Popular Video

Decoders and Encoders section. A complete list of supported

video interfaces and sampling rates is included in Table V.

Table V. Component Digital Video Interfaces

Nominal

Bits/

Color

Date

Name

Component

Space

Sampling

Rate (MHz) I/F Width

CCIR-656

8 or 10

YCrCb

4:2:2

8 or 10

Multiplex

Philips

8 or 10

YUV

4:2:2

<= 29.5

8 or 10

Philips

8 or 10

YUV

4:2:2

12.27-14.79

16 or 20

Gray Scale

8, 10, or 12

Luma

4:0:0

12.27-14.79

8, 10 or 12

Internally, the video interface translates all video formats to one

consistent format to be passed to the wavelet kernel. This con-

sistent internal video standard is 4:2:2 at 16 bits accuracy.

VITC and Closed Captioning Support

The video interface also supports the direct loss-less extraction

of 90-bit VITC codes during encode and the insertion of VITC

codes during decode. Closed Captioning data (found on active

Video Line 21) is handled just as normal active video on an

active scan line. As a result, no special dedicated support is

necessary for Closed Captioning. The data rates for Closed

Captioning data are low enough to ensure robust operation of

this mechanism at compression ratios of 50:1 and higher. Note

that you must include Video Line 21 in the ADV601’s defined

active video area for Closed Caption support.

27 MHz Nominal Sampling

There is one clock input (VCLK) to support all internal process-

ing elements. This is a 50% duty cycle signal and must be syn-

chronous to the video data. Internally this clock is doubled using

a phase locked loop to provide for a 54 MHz internal processing

clock. The clock interface is a two pin interface that allows a

crystal oscillator to be tied across the pins or a clock oscillator to

drive one pin. The nominal clock rate for the video interface is

27 MHz. Note that the ADV601 also supports pixel rates ranging

from 12.27 MHz to 14.75 MHz (VCLK rates from 24.54 MHz to

29.5 MHz).

Video Interface and Modes

In all, there are seven programmable features that configure the

video interface. These are:

• Encode-Decode Control

In addition to determining what functions the internal pro-

cessing elements must perform, this control determines the

direction of the video interface. In decode mode, the video

interface outputs data. In encode mode, the interface receives

data. The state of the control is reflected on the ENC pin.

This pin can be used as an enable input by external line driv-

ers. This control is maintained by the host processor.

• Master-Slave Control

This control determines whether the ADV601 generates or

receives the VSYNC, HSYNC, CREF, and FIELD signals. In

master mode, the ADV601 generates these signals for external

hardware synchronization. In slave mode, the ADV601 re-

ceives these signals. Note that some video formats require the

ADV601 to operate in slave mode only. This control is main-

tained by the host processor.

• 525-625 (NTSC-PAL) Control

This control determines whether the ADV601 is operating on

525/NTSC video or 625/PAL video. This information is used

when the ADV601 is in master and decode modes so that the

ADV601 knows where and when to generate the HSYNC,

VSYNC, and FIELD Pulses as well as when to insert the SAV

and EAV time codes (for CCIR-656 only) in the data stream.

This control is maintained by the host processor. Table VI

shows how the 525-625 Control and Square Pixel Control in

the Mode Control register work together.

Table VI. Square Pixel Control, 525-625 Control, and

Video Formats

Square

Max

Pixel

525-625

Horizontal

Field

Control

Size

NTSC-PAL

720

243

CCIR-601 NTSC

720

288

CCIR-601 PAL

640

243

Square Pixel NTSC

768

288

Square Pixel PAL

• Square Pixel Control

This control determines whether the ADV601 is operating on

square pixel video. For square pixel NTSC, the 525-625

Control is set to 525 and the Square Pixel Control is asserted.

For square pixel PAL, the 525-625 Control is set to 625 and

the Square Pixel Control is asserted. Also note that the VCLK

input differs for NTSC and PAL video.

• Bipolar/Unipolar Color Component

This mode determines whether offsets are used on color com-

ponents. In Philips mode, this control is usually set to Bipo-

lar, since the color components are normal twos-compliment

signed values. In CCIR-656 mode, this control is set to Uni-

polar, since the color components are offset by 128. Note that

it is likely the ADV601 will function if this control is in the

wrong state, but compression performance will be degraded.

It is important to set this bit correctly.

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