adv601lc Analog Devices, Inc., adv601lc Datasheet - Page 2

• Manufacturer Part Number: adv601lc
• Description: Ultralow Cost Video Codec
• Manufacturer: Analog Devices, Inc.

ADV601LC
Standard
Name
CCIR-601/525
CCIR-601/625
NOTES
1
2
TABLE OF CONTENTS
This data sheet gives an overview of the ADV601LC functional-
ity 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
THE WAVELET KERNEL . . . . . . . . . . . . . . . . . . . . . . . . . 4
THE PROGRAMMABLE QUANTIZER . . . . . . . . . . . . . . . 7
THE RUN LENGTH CODER AND HUFFMAN CODER . . 8
PROGRAMMER’S MODEL . . . . . . . . . . . . . . . . . . . . . . . . 8
ADV601LC REGISTER DESCRIPTIONS . . . . . . . . . . . . 10
PIN FUNCTION DESCRIPTIONS . . . . . . . . . . . . . . . . . 16
APPLYING THE ADV601LC . . . . . . . . . . . . . . . . . . . . . . 28
GETTING THE MOST OUT OF ADV601LC . . . . . . . . . 30
ADV601LC SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . 31
TEST CONDITIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
TIMING PARAMETERS . . . . . . . . . . . . . . . . . . . . . . . . . . 32
PINOUTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
PIN CONFIGURATION . . . . . . . . . . . . . . . . . . . . . . . . . . 43
OUTLINE DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . 44
ORDERING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
The maximum active field size is 720 by 288.
The maximum pixel rate is 13.5 MHz.
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Encoding vs. Decoding . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Video Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Host Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
DRAM Manager . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Compressed Data-Stream Definition . . . . . . . . . . . . . . . . 22
Using the ADV601LC in Computer Applications . . . . . . 28
Connecting the ADV601LC to Popular Video Decoders
Clock Signal Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
CCIR-656 Video Format Timing . . . . . . . . . . . . . . . . . . . 33
Multiplexed Philips Video Timing . . . . . . . . . . . . . . . . . . 35
Host Interface (Indirect Address, Indirect Register Data,
Host Interface (Compressed Data) Register Timing . . . . 40
Using the ADV601LC in Stand-Alone Applications . . . . 29
and Encoders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
and Interrupt Mask/Status) Register Timing . . . . . . . . 38
Active
Region
Horizontal
720
720
Active
Region
243
288
Vertical
Table I. ADV601LC Field Rates and Sizes
1
Total
Region
Horizontal
858
864
–2–
GENERAL DESCRIPTION
The ADV601LC 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 ADV601LC is
designed only for real-time interlaced video, full frames of video
are formed and processed as two independent fields of data.
The ADV601LC 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 ADV601LC has a generic 16-/32-bit host interface, which
includes a 512-position, 32-bit wide FIFO for compressed video.
With additional external hardware, the ADV601LC’s host inter-
face 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 ADV601LC 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 ADV601LC 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 application. The sub-band coding architecture of the
ADV601LC provides a number of options to stretch compres-
sion performance. These options are outlined on in the Apply-
ing the ADV601LC section.
DIGITAL VIDEO OUT
DIGITAL VIDEO IN
VIDEO INTERFACE
(ENCODE)
(DECODE)
Total
Region
Vertical
262.5
312.5
Figure 1. Functional Block Diagram
ADV601LC
VIDEO CODEC
ULTRALOW
COST,
(Continued from page 1)
Field Rate
(Hz)
59.94
50.00
HOST INTERFACE
COMPRESSED
VIDEO OUT
(ENCODE)
STATUS AND CONTROL
COMPRESSED VIDEO IN
(DECODE)
Pixel Rate
(MHz)
13.50
13.50
REV. 0
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