CSC Function on ADV7610

Question

Hello, 
 I've received questions for CEC of ADV7610. Could you check following query? 
 Item 1 : Regarding CSC from YPbPr IN to YPbPr OUT 
 They're using following register settings. If they'd like to make the configuration of " YPbPr IN to YPbPr OUT", can it be achieved by simply changing "address 0x02 -> 0xF2" to "address 0x02 -> 0xF0"? 
 If it needs any other settings, please let me know. 
 
 Item 2 : Regarding 24bit SDR422 mode 
 Their current setting is 24bit SDR 422 mode. With the current settings for "YPbPr in + YPbPr out", is the 12 pin for Y output/PbPr output 0 padding for the lower 4 bits? 
 If this is used as "RGB in + YPbPr out" and internal CSC is used, will the internal calculation result come out in 12bit full? Or is the lower 4 bits 0 padding (if 0 padding, I would like to know whether it is rounded or truncated)? 
 
 Best Regards, 
 S.O.

PoornimaSubramani · Accepted Answer

Hi Katsuya San, 
 Please find the below comments, 
 What is the purpose of this Backend ColoSpace conversion and why it is located here? 
 "Back End CSC" is nothing, but the CSC in the CP and it is not an extra one. 
 The use of the CP CSC prevents timing mismatches between the luma and the chroma channels that can occur when the DPP CSC is used. 
 
 Also, ADV7610 automatically configures the DPP CSC depending on the input and output formats and the use of the color control feature and note that DPP CSC is always in pass-through mode unless the ADV7610 is processing an RGB input, outputting this input in the RGB color space and VID_ADJ_EN is enabled. 
 
 ADI Recommended Setting: 
 These are register values which are determined during characterization and values are given that you must write. They sometimes change from recommended settings version to version. They are not documented, you simply need to write the value as per recommended setting / Script. Please note that, If those writes are not included, Part would not expect to work reliably . 
 Those registers are generally internal settings that let us handle process variation which is why they are determined during characterization. The settings that show up as "ADI Recommended Settings" are the values that work reliably across different voltage and temperature. They really should be called "ADI Required settings". 
 
 Non-Fast Switching Mode: 
 Fast switching is nothing but the part can lock to an video source more quickly in less than 1 second between two HDMI ports. 
 This feature allows the user of a system containing the chip to seamlessly switch between HDCP encrypted sources. There is no delay in achieving video output which was previously caused by HDCP authentication. The time required to switch between HDMI sources with HDCP encryption is reduced to a fraction of a second. 
 As for the IO address 0x02h, the setting of 0xF5h means the Auto CSC and YPbPr out as the output of CP block. This "Auto CSC" means that checking the input AVI info and by the combination of input color space detected by the AVI info and RGB_OUT setting, color space conversion is determined, is it correct? 
 
 In automatic CSC mode, the user is required to program the input color space and the output color space for the correct operation of the CSC matrix. 
 Manual CSC mode allows the user to program all the color space conversion by manually programming CSC coefficients. 
 Note: ADV761x output is RGB, then you should use CP_MODE_GAIN_ADJ to increase brightness. ADV761x output is YCbCr/YPbPr, then you should use BRIGHTNESS_CNTRL to increase brightness. 98 02 F5 ; Auto CSC, YCrCb Out, Set op_656 bit 98 02 F7 ; Auto CSC, RGB Out, Set op_656 bit 
 
 I use the setting of IO map address 0xBF and set 0x01, it means bypass CP core. ? 
 
 Bypassing the CP means we can't do any color space conversion or other manipulation of the video data. Please note that, For full processing of the HDMI input, the CP core needs to be powered up. Also On this part, the STDI block is located within the CP core, bypassing the CP core is not a valid thing to do if you are using the STDI block. 
 
 Thanks, 
 Poornima)

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