參數(shù)資料
型號(hào)： EVAL-AD9393-ABZ
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 40/40頁(yè)
文件大?。?/td> 0K
描述： EVAL BOARD AD9393
標(biāo)準(zhǔn)包裝： 1
主要目的： 視頻，開關(guān)，HDMI
嵌入式： 否
已用 IC / 零件： AD9393
已供物品： 板
AD9393
Rev. 0 | Page 9 of 40
TIMING
The output data clock signal is created so that its rising edge
always occurs between data transitions and can be used to latch
the output data externally.
Figure 3 shows the timing operation of the AD9393.
tPER
tDCYCLE
tSKEW
DATACK
DATA
HSOUT
08
04
3-
0
03
Figure 3. Output Timing
HDMI RECEIVER
The HDMI receiver section of the AD9393 allows the reception
of a digital video stream (which is backward compatible with
DVI and able to accommodate video of various formats (RGB,
YCrCb 4:4:4, 4:2:2)). The receiver also allows up to eight channels
of audio. Infoframes are transmitted carrying information about
the video format, audio clocks, and many other items necessary
for a monitor to utilize fully the information stream available.
The earlier digital visual interface (DVI) format was restricted
to an RGB 24-bit color space only. Embedded in this data stream
were HSYNCs, VSYNCs, and display enable (DE) signals; but
no audio information. The HDMI specification allows trans-
mission of all the DVI capabilities, but adds several YCrCb
formats that make the inclusion of a programmable color space
converter (CSC) a very desirable feature. With this feature, the
scaler following the AD9393 can specify that it always wishes to
receive a particular format, for instance, 4:2:2 YCrCb, regardless
of the transmitted mode. If RGB is sent, the CSC can easily
convert that to 4:2:2 YCrCb while relieving the scaler of this
task.
In addition, the HDMI specification supports the transmission
of up to eight channels of S/PDIF or I2S audio. The audio infor-
mation is separated into packets and transmitted during the
video blanking periods along with specific information about
the clock frequency. Part of this audio information (audio
infoframe) tells the user how many channels of audio are being
transmitted, where the channels should be placed, information
regarding the source (make, model), and other data.
DE GENERATOR
The AD9393 has an on-board generator for DE, for the start
of active video (SAV), and for the end of active video (EAV), all
of which are necessary for describing the complete data stream
for a BT656-compatible output. This signal alerts the following
circuitry, which are displayable video pixels.
4:4:4 TO 4:2:2 FILTER
The AD9393 contains a filter that allows it to convert a
signal from YCrCb 4:4:4 to YCrCb 4:2:2 while maintaining
the maximum accuracy and fidelity of the original signal.
Input Color Space to Output Color Space
The AD9393 can accept a wide variety of input formats and
either retain that format or convert to another. Input formats
supported are
4:4:4 YCrCb 8-bit
4:2:2 YCrCb 8-, 10-, and 12-bit
RGB 8-bit
Output modes supported are
4:4:4 YCrCb 8-bit
4:2:2 YCrCb 8-, 10-, and 12-bit
Dual 4:2:2 YCrCb 8-bit
Color Space Conversion (CSC) Matrix
The CSC matrix in the AD9393 consists of three identical
processing channels. In each channel, three input values are
multiplied by three separate coefficients. An offset value for
each row of the matrix and a scaling multiple for all values
are also included. Each value has a 13-bit, twos complement
resolution to ensure the signal integrity is maintained. The
CSC is designed to run at speeds up to 80 MHz supporting
resolutions up to 720p at 60 Hz. With any-to-any color space
support, formats such as RGB, YUV, YCrCb, and others are
supported by the CSC.
The main inputs, RIN, GIN, and BIN, come from the 8-bit or 12-
bit inputs from each channel. These inputs are based on the
input format detailed in Table 30 to Table 52. The mapping of
these inputs to the CSC inputs is shown in Table 6.
Table 6. CSC Port Mapping
Input Channel
CSC Input Channel
R/Cr (D[23:16])
RIN
Gr/Y (D[15:8])
GIN
B/Cb (D[7:0])
BIN
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