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AD9393 데이터시트(PDF) 9 Page - Analog Devices |
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AD9393 데이터시트(HTML) 9 Page - Analog Devices |
9 / 40 page 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 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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