DS90UB926Q-Q1: Can 941 D_GPIO be mapped to 926 GPIO？

Shubiao Wang

Intellectual 1490 points

Part Number: DS90UB926Q-Q1
Other Parts Discussed in Thread: DS90UB941AS-Q1

Hi,

Is it possible for D_GPIO[3:0] signals going from 941 TX port 1 to 926 GPIO[3:0]?

the block diagram is shown below.

Best regards,

Shubiao Wang

over 5 years ago

0 Aaron Heng over 5 years ago

TI__Mastermind 37260 points

Hi Shubiao,

The GPIOs mapping are fixed for 92x and 94x devices. The GPIO[0:3] of the 926 maps to GPIO[0:3] of the 941AS. This due to the GPIOs is assigned to PORT0 and D_GPIOs is assigned to PORT1. Therefore, you can't have them interchange.

Aaron

0 Shubiao Wang over 5 years ago in reply to Aaron Heng

TI__Intellectual 1490 points

Hi Aaron,

Below is what I found in the app note, "splitter mode operation with ds90ub941as-q1",https://www.ti.com/lit/an/snla308/snla308.pdf?ts=1597200393896&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FDS90UB941AS-Q1%253FkeyMatch%253DDS90UB941%2526tisearch%253DSearch-EN-everything%2526usecase%253DGPN

In this block diagram, a 94x port 0, GPIO[0:3] is connected to 941 port 1. Why 94x GPIO could be mapped to 941 DGPIO?

BRs,Shubiao

0 Shubiao Wang over 5 years ago in reply to Shubiao Wang

TI__Intellectual 1490 points

Hi Aaron,

Please also advise which device should I use for DES B, shown in the block diagram below.

DGPIO[0:3] goes over 941 Port 1; 941 port 1 connects to DES B, the output video interface can be RGB, LVDS, DSI.

BRs ,Shubiao

0 Aaron Heng over 5 years ago in reply to Shubiao Wang

TI__Mastermind 37260 points

Hi Shubiao,

Like I mentioned on the previous posted. The GPIO physical mapping is fixed, which mean you can't connect D_GPIOs to normal GPIOs. So, if you want to use D_GPIOs on the 941AS, you must use the D_GPIOs pin on deserializer side. I will look into this if I can map this.

Aaron

0 Aaron Heng over 5 years ago in reply to Aaron Heng

TI__Mastermind 37260 points

Hi Shubiao,

I reviewed and investigated on your diagram. Based on your diagram, the GPIO should work. When 941AS device is in a splitter mode or independent mode of operation, the first link use normal GPIOs where the second link use the D_GPIOs. This will map to 926 GPIO since 926 operates in single port only. It just is connected to the 2nd port on the 941AS.

Hope this helps. Let me know if you have further questions.

Aaron

0 Shubiao Wang over 5 years ago in reply to Aaron Heng

TI__Intellectual 1490 points

Hi Aaron,

Thanks for your updates.

It is appreciated if you could have an experiment for this case or double-check with the designer. We need your double confirm to move forward since this question has blocked the progress of the project.

BRs,

Shubiao Wang

0 Aaron Heng over 5 years ago in reply to Shubiao Wang

TI__Mastermind 37260 points

Hi Shubiao,

Yes. This should work.

Aaron

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DS90UB926Q-Q1: Can 941 D_GPIO be mapped to 926 GPIO？