ADV601 データシートの表示（PDF） - Analog Devices

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ADV601

Low Cost Multiformat Video Codec

Analog Devices 

ADV601

TABLE OF CONTENTS

This data sheet gives an overview of the ADV601 functionality

and provides details on designing the part into a system. The

text of the data sheet is written for an audience with a general

knowledge of designing digital video systems. Where appropri-

ate, additional sources of reference material are noted through-

out the data sheet.

GENERAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . 1

INTERNAL ARCHITECTURE . . . . . . . . . . . . . . . . . . . . . 3

GENERAL THEORY OF OPERATION . . . . . . . . . . . . . . . 3

References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

THE WAVELET KERNEL . . . . . . . . . . . . . . . . . . . . . . . . . 4

THE PROGRAMMABLE QUANTIZER . . . . . . . . . . . . . . . 7

THE RUN LENGTH CODER AND HUFFMAN CODER . . 8

Encoding vs. Decoding . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

PROGRAMMER’S MODEL . . . . . . . . . . . . . . . . . . . . . . . . 8

ADV601 REGISTER DESCRIPTIONS . . . . . . . . . . . . . . . 10

PIN FUNCTION DESCRIPTIONS . . . . . . . . . . . . . . . . . 16

Video Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Host Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

DSP Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

DRAM Manager . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Compressed Data-Stream Definition . . . . . . . . . . . . . . . . 26

APPLYING THE ADV601 . . . . . . . . . . . . . . . . . . . . . . . . . 32

Using the ADV601 in Computer Applications . . . . . . . . 32

Using the ADV601 in Stand-Alone Applications . . . . . . . 32

Connecting the ADV601 to Popular Video Decoders

and Encoders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

GETTING THE MOST OUT OF ADV601 . . . . . . . . . . . 35

ADV601 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . 36

TEST CONDITIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

TIMING PARAMETERS . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Clock Signal Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

CCIR-656 Video Format Timing . . . . . . . . . . . . . . . . . . . 38

Gray Scale/Philips Video Timing . . . . . . . . . . . . . . . . . . . 40

Multiplexed Philips Video Timing . . . . . . . . . . . . . . . . . . 43

Host Interface (Indirect Address, Indirect Register Data,

and Interrupt Mask/Status) Register Timing . . . . . . . . 45

Host Interface (Compressed Data) Register Timing . . . . 47

DSP Interface Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

GENERAL DESCRIPTION (Continued from page 1)

VIDEO INTERFACE

DIGITAL VIDEO IN

(ENCODE)

DIGITAL VIDEO OUT

(DECODE)

ADV601

LOW COST,

MULTIFORMAT

VIDEO CODEC

HOST INTERFACE

COMPRESSED

VIDEO OUT

(ENCODE)

STATUS & CONTROL

COMPRESSED VIDEO IN

(DECODE)

Figure 1. Functional Block Diagram

The ADV601 adheres to international standard CCIR-601 for

studio quality digital video. The codec also supports a range of

field sizes and rates providing high performance in computer,

PAL, NTSC, or still image environments. The ADV601 is

designed only for real-time interlaced video, full frames of video

are formed and processed as two independent fields of data.

The ADV601 supports the field rates and sizes in Table I. Note

that the maximum active field size is 768 by 288. The maximum

pixel rate is 14.75 MHz.

The ADV601 has a generic 8-/16-/32-bit host interface, which

includes a 512 position, 32-bit wide FIFO for compressed video.

With additional external hardware, the ADV601’s host interface

is suitable (when interfaced to other devices) for moving com-

pressed video over PCI, ISA, SCSI, SONET, 10 Base T, ARCnet,

HDSL, ADSL, and a broad range of digital interfaces. For a full

description of the Host Interface, see the Host Interface section.

The compressed data rate is determined by the input data rate

and the selected compression ratio. The ADV601 can achieve a

near constant compressed bit rate by using the current field

statistics in the off-chip bin width calculator on the external

DSP or Host. The process of calculating bin widths on a DSP

or Host can be “adaptive,” optimizing the compressed bit rate

in real time. This feature provides a near constant bit rate out of

the host interface in spite of scene changes or other types of

source material changes that would otherwise create bit rate

burst conditions. For more information on the quantizer, see

the Programmable Quantizer section.

The ADV601 typically yields visually loss-less compression on

natural images at a 4:1 compression ratio. Desired image quality

levels can vary widely in different applications, so it is advisable

to evaluate image quality of known source material at different

compression ratios to find the best compression range for the

Standard

Name

Active

Region

Horizontal

CCIR-601/525 720

CCIR-601/625 720

Sq. Pixel/525

640

Sq. Pixel/625

768

NOTES

1The maximum active field size is 768 by 288.

2The maximum pixel rate is 14.75 MHz.

Table I. ADV601 Field Rates and Sizes

Active

Region

Vertical1

Total

Region

Horizontal

Total

Region

Vertical

243

858

262.5

288

864

312.5

243

780

262.5

288

944

312.5

Field Rate

(Hz)

59.94

50.00

59.94

50.00

Pixel Rate

(MHz)2

13.50

13.50

12.27

14.75

–2–

REV. 0

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