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Low Cost Multiformat Video Codec



Analog Devices 로고
Analog Devices
ADV601 데이터시트, 핀배열, 회로
a
Low Cost
Multiformat Video Codec
ADV601
FEATURES
Precise Compressed Bit Rate Control
Field Independent Compression
Flexible Video Interface Supports All Common
Formats, Including CCIR-656
General Purpose 8-, 16- or 32-Bit Host Interface With
512 Deep 32-Bit FIFO
PERFORMANCE
Real-Time Compression Or Decompression of CCIR-601
And Square Pixel Video:
720 ؋ 288 @ 50 Fields/Sec — PAL
768 ؋ 288 @ 50 Fields/Sec — PAL
720 ؋ 243 @ 60 Fields/Sec — NTSC
640 ؋ 243 @ 60 Fields/Sec — NTSC
Compression Ratios from Visually Loss-Less To 350:1
Visually Loss-Less Compression At 4:1 on Natural
Images (Typical)
APPLICATIONS
Nonlinear Video Editing
Video Capture Systems
Remote CCTV Surveillance
Digital Camcorders
Broadcast Quality Video Distribution Systems
Video Insertion Equipment
Image And Video Archival Systems
Digital Video Tape
High Quality Video Teleconferencing
GENERAL DESCRIPTION
The ADV601 is a very low cost, single chip, dedicated function,
all digital CMOS VLSI device capable of supporting visually
loss-less to 350:1 real-time compression and decompression of
CCIR-601 digital video at very high image quality levels. The
chip integrates glueless video and host interfaces with on-chip
SRAM to permit low part count, system level implementations
suitable for a broad range of applications.
The ADV601 is a video encoder/decoder optimized for real-time
compression and decompression of interlaced digital video. All
features of the ADV601 are designed to yield high performance
at a breakthrough systems-level cost. Additionally, the unique
sub-band coding architecture of the ADV601 offers you many
application-specific advantages. A review of the General Theory
of Operation and Applying the ADV601 sections will help you
get the most use out of the ADV601 in any given application.
The ADV601 accepts component digital video through the
Video Interface and outputs a compressed bit stream though the
Host Interface in Encode Mode. While in Decode Mode, the
ADV601 accepts a compressed bit stream through the Host
Interface and outputs component digital video through the
Video Interface. The host accesses all of the ADV601’s control
and status registers using the Host Interface. An optional Digital
Signal Processor (DSP) may be used for calculating quantiza-
tion Bin Widths (BW) (instead of the host); the ADV601 sends
current field statistics and receives Bin Width results as a packet
I/O over the DSP serial port interface. A generic fixed-point DSP
(for instance the ADSP-2105) is more than adequate for these
calculations. Figure 1 summarizes the basic function of the part.
FUNCTIONAL BLOCK DIAGRAM
(continued on page 2)
256K X 16-BIT DRAM
(FIELD STORE)
DSP
(OPTIONAL)
DIGITAL
COMPONENT
VIDEO I/O
DIGITAL
VIDEO I/O
PORT
DRAM
MANAGER
WAVELET
FILTERS,
DECIMATOR, &
INTERPOLATOR
SERIAL
PORT
ADAPTIVE
QUANTIZER
ADV601
LOW COST, MULTIFORMAT
VIDEO CODEC
RUN
LENGTH
CODER
HUFFMAN
CODER
HOST
I/O PORT
& FIFO
HOST
ON-CHIP
TRANSFORM
BUFFER
REV. 0
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700 World Wide Web Site: http://www.analog.com
Fax: 617/326-8703
© Analog Devices, Inc., 1997


ADV601 데이터시트, 핀배열, 회로
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
CCIR-601/625
Sq. Pixel/525
Sq. Pixel/625
720
720
640
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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