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(ADV7480)About checking frame rate and aspect ratio.

Question asked by donadona999s on Apr 24, 2018
Latest reply on Apr 25, 2018 by donadona999s

Hi !

 

I have few questions about the title.

I asked about this at the past thread.

(ADV7480)To check frame rate and aspect ratio. 

 

Q1)

How does ADV7480 measure these information?

There is no infoframe when Tx is sending DVI so I am concerned how ADV7480 detect these information.

Counting some time with ADV7480 main CLK?

Or just count pixel CLK?

Please give me some information.

 

Q2)

What is different between this.

************************************************************************************************

  • total_line_width[13:0], HDMI RX Map, Address 0x1E[5:0]; Address 0x1F[7:0] (Read Only)
  • field0_total_height[13:0], HDMI RX Map, Address 0x26[5:0]; Address 0x27[7:0] (Read Only)
  • field1_total_height[13:0], HDMI RX Map, Address 0x28[5:0]; Address 0x29[7:0] (Read Only)

************************************************************************************************

  • line_width[12:0], HDMI RX Map, Address 0x07[4:0]; Address 0x08[7:0] (Read Only)
  • field0_height[12:0], HDMI RX Map, Address 0x09[4:0]; Address 0x0A[7:0] (Read Only)
  • field1_height[12:0], HDMI RX Map, Address 0x0B[4:0]; Address 0x0C[7:0] (Read Only)

************************************************************************************************

I think total means it includes blanking area and others don't include blanking area(only active area).

Is my understanding correct?


Best regards

Kawa 

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