Linux/DS90UB954-Q1: UB954 +UB913 yuv422

user5183370

Intellectual 510 points

Part Number: DS90UB954-Q1

Tool/software: Linux

We use UB913+UB954 to transform YUV422 frmaes.

As UB913 can only work at 10bit /12 bit mode, then in UB954 it will process the data as 10bit / 12bit.

But the in our YUV422 frmaes, the valid date is only 8bit.

We need to configure the UB913 work at 10bit mode ; ub954's 0x7c regiester's value to 0xC0. 0x70 regiester's value to 0x1E (mipi csi2 0x1E YUV 422 -8BIT).

It could work well.

What puzzled me is that , the process & MIPI CSI2 output of UB954.

1. If we configure 0x7c = 0xC0 ,the UB954 only proesss the lower 8bit value form ub913, the higher 2bit will be discard ? and the output of ub954 is 8bit not 10bit , right?

2. If we configure 0x7c = 0xC0 ,but the 0x70 =0x2B, then how ub954 process the data ? 8bit ? 10bit?

3. I want to confirm what the relationshiip between the 0x7c & 0x70 ? How UB954 output MIPI CSI singal when 0x7c & 0x70 configured different values?

over 6 years ago

0 Steven(Shenzhen) Shi over 6 years ago

TI__Mastermind 30515 points

Hi pls follow up CSI2 spec. and ub933 video input format to set up 0x70 and 0x7c. 0x70 is to tell CSI2 video fornat. when running at 8bits input of ub933, you should set the reg. 0x7c.

Steven

0 user5183370 over 6 years ago in reply to Steven(Shenzhen) Shi

Intellectual 510 points

It's easy to implement this function.
But I want to analysis the principle of the UB954 processing. Pls hekp reslove my probleams,thanks.

Also , in TI's TDA3X SDK , it configure the 0x7c = 0xC0 , but 0x70 = 0x2B, how it works?

0 Steven(Shenzhen) Shi over 6 years ago in reply to user5183370

TI__Mastermind 30515 points

Hello,

This is CSI2 spec. request. can you check the mipi csi2 spec. 1.2 which has clear definition and request on video format package. reg. 0x70 and 7c are used to match it. i believe this is what you think the principle is?

simplily this just is function design to catch stardard of csi2.

1. If we configure 0x7c = 0xC0 ,the UB954 only proesss the lower 8bit value form ub913, the higher 2bit will be discard ? and the output of ub954 is 8bit not 10bit , right?

--yes. 8bits/16bits(2 B) as your video input is 8b. pls remember, ub954 outputs what the input is in 913a's.

2. If we configure 0x7c = 0xC0 ,but the 0x70 =0x2B, then how ub954 process the data ? 8bit ? 10bit?

--10bits. the video data is destroyed at this setting.

3. I want to confirm what the relationshiip between the 0x7c & 0x70 ? How UB954 output MIPI CSI singal when 0x7c & 0x70 configured different values?

--independent. but you should configre it correctly to catch csi2 spec. or else video output is wrong.

Steven

0 Steven(Shenzhen) Shi over 6 years ago in reply to user5183370

TI__Mastermind 30515 points

Hi, may I know your email box or cell phone? thanks.

regards,
Steven

0 user5183370 over 6 years ago in reply to Steven(Shenzhen) Shi

Intellectual 510 points

Hi, can you leave your email box , I will develiver you my cell phone .

Thanks.

0 Steven(Shenzhen) Shi over 6 years ago in reply to user5183370

TI__Mastermind 30515 points

You can email the message to me. thanks.

regards,
Steven

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Linux/DS90UB954-Q1: UB954 +UB913 yuv422