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ADV601

ADV601首页预览图
型号: ADV601
PDF文件:
  • ADV601 PDF文件
  • ADV601 PDF在线浏览
功能描述: Low Cost Multiformat Video Codec
PDF文件大小: 606.16 Kbytes
PDF页数: 共52页
制造商: AD[Analog Devices]
制造商LOGO: AD[Analog Devices] LOGO
制造商网址: http://www.analog.com
捡单宝ADV601
PDF页面索引
120%
ADV601
–24–
REV. 0
Video Formats — Multiplexed Philips Video
The ADV601 supports a hybrid mode of operation that is a cross
between standard dual lane Philips and single lane CCIR-656. In
this mode, video data is multiplexed in the same fashion in CCIR-656,
but the values 0 and 255 are not reserved as signaling values. In-
stead, external HSYNC and VSYNC pins are used for signaling
and video synchronization. VCLK may range up to 29.5 MHz.
VCLK is driven with up to a 29.5 MHz 50% duty cycle clock
synchronous with the video data. Video data is clocked on the
rising edge of the VCLK signal. The functionality of HSYNC,
VSYNC, and FIELD pins is dependent on three programmable
modes of the ADV601: Master-Slave Control, Encode-Decode
Control, and 525-625 Control. Table XI summarizes the func-
tionality of these pins in various modes.
Table XI. Philips Multiplexed Video Master and Slave Modes HSYNC, VSYNC, and FIELD Functionality
HSYNC, VSYNC and FIELD
Functionality for Multiplexed Master Mode (HSYNC, VSYNC Slave Mode (HSYNC, VSYNC
Philips and FIELD Are Outputs) and FIELD Are Inputs)
Encode Mode (video data is input The ADV601 completely manages the generation and These pins are used to control the
to the chip) timing of these pins. The device driving the ADV601 blanking of video and sequencing.
video interface must use these outputs to remain in
sync with the ADV601. It is expected that this com-
bination of modes would not be used frequently.
Decode Mode (video data is output The ADV601 completely manages the generation These pins are used to control the
from the chip) and timing of these pins. blanking of video and sequencing.
Video Formats — Gray Scale Video
The Gray Scale video format requires 4:0:0 data (up to 12 bits)
be transmitted over a one “lane” 8- to 12-bit physical interface.
A video clock (typically 27 MHz) is transmitted along with the
data. This clock is synchronous with the data and runs at twice
the transfer rate of the interface. The color space is Gray Scale.
Because the ADV601 internal processing is not dependent on
color space, Gray Scale data is processed in the same manner as
data in other color spaces.
VCLK is driven with a 24.54 MHz–29.5 MHz, 50% duty cycle
clock which is synchronous with the video data. Video data is
clocked on the second rising edge of the VCLK signal.
These video formats require external synchronization and
blanking signals to accompany digital video. These signals are
VSYNC, HSYNC, and FIELD. In general, when the ADV601
is configured as an encoder, these signals will all be inputs.
When the ADV601 is configured as a decoder, these signals will
be outputs. There are special cases for this format described in
Table XII.
Table XII. Gray Scale Video Master and Slave Modes HSYNC, VSYNC and FIELD Functionality
HSYNC, VSYNC, and FIELD
Functionality for Gray Scale Master Mode (HSYNC, VSYNC, Slave Mode (HSYNC, VSYNC,
Format CREF and FIELD Are Outputs) CREF and FIELD Are Inputs)
Encode Mode (video data is input The ADV601 completely manages the generation and These pins are used to control the
to the chip) timing of these pins. The device driving the ADV601 blanking of video and sequencing.
video interface must use these outputs to remain in
sync with the ADV601. It is expected that this com-
bination of modes would not be used frequently.
Decode Mode (video data is output The ADV601 completely manages the generation These pins are used to control the
from the chip) and timing of these pins. blanking of video and sequencing.
Video Formats—References
For more information on video interface standards, see the
following reference texts.
For the definition of CCIR-601:
1992 – CCIR Recommendations RBT series Broadcasting Service
(Television) Rec. 601-3 Encoding Parameters of digital television
for studios, page 35, September 15, 1992.
For the definition of CCIR-656:
1992 – CCIR Recommendations RBT series Broadcasting Service
(Television) Rec. 656-1 Interfaces for digital component video
signals in 525 and 626 line television systems operating at the
4:2:2 level of Rec. 601, page 46, September 15, 1992.
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