720x480i HDMI

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720x480i HDMI

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k_nakayama
Contributor I

Now, I am continuing to attempt to make 720x480i 60Hz HDMI output signal from NTSC signal using TDA19988.

Although I write the commands into adequate register along the guideline published from NXP, no output come out.

Especially, as soon as I write the 0x01(repeate) data into RPT_CNTRL register,  the output is gone and the analyzer says that no data and sync is coming. 

I do not know what is wrong.

Please anyone help me regarding above problem.

Following is the main command I wrote.

i2c_send_data(CEC_ADDR,TDA_CEC_ENAMODS,0x02); // Active HDMI Clock Tree

tda_reg_write(current, TDA_PLL_SERIAL_1, 0x00); // PLL rate and pixel repeat
tda_reg_write(current, TDA_PLL_SERIAL_2, 0x13); // PLL rate and pixel repeat
tda_reg_write(current, TDA_PLL_SERIAL_3, 0x01); // Serial_CCIR
tda_reg_write(current, TDA_VIDFORMAT, 0x04); // 7820x480i30 Format
tda_reg_write(current, TDA_TBG_CNTRL_0, 0x02); // Select Resync method
tda_reg_write(current, TDA_TBG_CNTRL_1, 0x00); // Select Resync method

tda_reg_write(current, REG_VIP_CNTRL_0, 0xDC); // Input Data Swap
tda_reg_write(current, TDA_VIP_CNTRL_3, 0x16); // DE sync method + H/V toggle
tda_reg_write(current, TDA_VIP_CNTRL_4, 0x10); // Activate CCIR656 data demultiplexing

tda_reg_write(current, 0x000E, 0x0D); // Enable color space
tda_reg_write(current, TDA_MAT_CONTRL, 0x01); // Enable color space matrix

tda_reg_write(current, REG_HVF_CNTRL_0, 0x01); // Select CCIR656 interpolation
tda_reg_write(current, REG_HVF_CNTRL_1, 0x54); // Select CCIR656 interpolation

tda_reg_write(current, REG_REFPIX_LSB, 0x11); // Ref pixel initialization value
tda_reg_write(current, REG_REFLINE_LSB, 0x02); // Ref line initialization value

tda_reg_write(current, REG_RPT_CNTRL, 0x01); // Pixel Repeat

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guoweisun
NXP TechSupport
NXP TechSupport

Hi

Please contact with local NXP distributors for help this special device.

They will forward your problem to NXP TDA19988 support team after verify!

Hope this could help you!

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