參數(shù)資料
型號(hào)： ADV601JS
廠商： ANALOG DEVICES INC
元件分類(lèi)： 消費(fèi)家電
英文描述： Low Cost Multiformat Video Codec
中文描述： SPECIALTY CONSUMER CIRCUIT, PQFP160
封裝： PLASTIC, QFP-160
文件頁(yè)數(shù)： 2/52頁(yè)
文件大?。?/td> 606K
代理商： ADV601JS
ADV601
–2–
REV. 0
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
)
ADV601
LOW COST,
MULTIFORMAT
VIDEO CODEC
VIDEO INTERFACE
HOST INTERFACE
DIGITAL VIDEO IN
(ENCODE)
DIGITAL VIDEO OUT
(DECODE)
COMPRESSED
VIDEO OUT
COMPRESSED VIDEO IN
(DECODE)
STATUS & CONTROL
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
Table I. ADV601 Field Rates and Sizes
Active
Region
Horizontal
Active
Region
Vertical
1
Total
Region
Horizontal
Total
Region
Vertical
Standard
Name
Field Rate
(Hz)
Pixel Rate
(MHz)
2
CCIR-601/525
CCIR-601/625
Sq. Pixel/525
Sq. Pixel/625
720
720
640
768
243
288
243
288
858
864
780
944
262.5
312.5
262.5
312.5
59.94
50.00
59.94
50.00
13.50
13.50
12.27
14.75
NOTES
1
The maximum active field size is 768 by 288.
2
The maximum pixel rate is 14.75 MHz.
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