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Question about bt.656 progressive video capture function.

Question asked by Takayuki Ishii on Oct 16, 2017
Latest reply on Oct 19, 2017 by Takayuki Ishii

Hello 

 

I have three questions about bt.656 progressive video capture function.

In this time,  section "2.5.2 CCIR Register Setting for Progressive Signal" in document

iMX6 IPU TVIN Application Notes  say that 

"in register IPU_CSI_CCIR_CODE_1, only CSI_STRT_FLD0_BLNK_1ST, CSI_STRT_FLD0_ACTV and
CSI_END_FLD0_ACTV are used, the three bits register value for each region (MSB to LSB) is H, V, F
data, and F is always 0."

1) Why only this three bit field are used?

2) Some video decoder output BT656 progressive data with F bit = 1.

    In this time, is this decoder not used with iMX6?

3) How detect a start line of the new frame/ blanking and Active Video area?

    Only F,V,H bit pattern match with CSI_CCIR_CODE_1 register bit?

    or use some other condition like IPU_CSI_SENS_FRM_SIZE and IPU_CSI_ACT_FRM_SIZE value.

 

Best regards,

Ishii.

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