DS90UB925Q-Q1: DS90UB925 paired with DS90UB940 Application

Terry wu

Part Number: DS90UB925Q-Q1

It is known from the specification that DS90UB925 can support YUV data.

When 925 paired with 940,If the input is YUV422-8b, I have some questions as bellow : Thanks!

1.can I connect the data bus into 925 DIN0 to DIN7 pins? Frame valid(FV) to 925 VS pin? Line valid(LV) to 925 HS pin or DE pin ?

2.How to configure 925/940 registers to work this? (I see the D/S, there no any registers Example )

See my Application as bellow:

YUV422-8b--->UB925--->UB940--->CSI(YUV422-8b)

over 4 years ago

0 Charley Cai over 4 years ago

TI__Genius 12866 points

Hi Terry,

I will look into this for you and get back to you by the end of the week.

Best Regards,

Charley Cai

0 Terry wu over 4 years ago in reply to Charley Cai

Intellectual 330 points

I look forward to your reply,thanks.

By the way,my consumer used UB940 in currently design ,so they can't use 913/954 for the Application .

0 Charley Cai over 4 years ago in reply to Terry wu

TI__Genius 12866 points

yes, understand that 913/954 cannot be used.

0 Charley Cai over 4 years ago in reply to Charley Cai

TI__Genius 12866 points

Hi Terry,

You should connect to R[7:0] on 925 and set 940 register 0x6B to 0x1E for YUV422-8bit.

R[7] is the MSB.

Best Regards,

Charley Cai

0 Terry wu over 4 years ago in reply to Charley Cai

Intellectual 330 points

Hi Charley,

Thanks for your reply.

But,the register 0x6B can't set to 0x1E ,that is only Reg0x6B [7:4] OFMT、Reg0x6B [3:2]IFMT.

How to configure OFMT/IFMT to work this?

If follow the options(YUV422 8-bit) in the d/s table(page41) , then IFMT.:00(RGB444),Is it right?

But i think UB940 didn't know the data is RGB or YUV in FPD-link, IFMT must be set correctly.

like ub954/ub913 needs to be set the link to RAW10 mode to processed L/H 8-bit data and change CSI datatype ,

How does UB940 know that the data comes from the input of UB925 R[7:0] or G[7:0] or B[7:0]?

Best Regards,

+1 Charley Cai over 4 years ago in reply to Terry wu

TI__Genius 12866 points

Hi Terry,

You are correct.

IFMT should be set to RGB444 and OFMT should be set to YUV422.

The RGB444 is a HDMI terminology basically means full RGB color.

The 925 will output R, G, B to 940 in a know format and 940 will repacketize the data following the 0x6B register.

Best Regards,

Charley Cai

0 Terry wu over 4 years ago in reply to Charley Cai

Intellectual 330 points

Hi Charley,

Thanks for your reply.

If UB940 OFMT set to YUV422.Is it the UB940 to repacketize the 8b data from only UB925 R[7:0] ??

Best Regards,

+1 Charley Cai over 4 years ago in reply to Terry wu

TI__Genius 12866 points

Hi Terry,

Yes, it should repacketize from R[7:0].

Best Regards,

Charley Cai

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DS90UB925Q-Q1: DS90UB925 paired with DS90UB940 Application