DS90UB954-Q1: TI954 and TI953 case

FL Y

Prodigy 160 points

Part Number: DS90UB954-Q1

We are use DS90UB954 and DS90UB953 serdes to connent camera module and host. Basic data follow is

Host->TI954->LVDS->TI953->IMX390. We want to use exteral GPIO from host to trigger IMX390 frame sync.

The trigger GPIO0 from TI954 will be used as trigger pin. And TI953 GPIO3 is connected with IMX390 frame sync pin.

But we found pull/down GPIO0 can't trigger GPIO3 signal. Below is our setting, pls help review and give right register

config. Thanks

954：
0x4c, 0x01
0x21, 0x81
0x33, 0x23
0x20, 0x20
0x42, 0x71
0x5c, 0x30 ---- SERDES address
0x5d, 0x42 ---- SENSOR address
0x65, 0x42 ---- SENSOR address
0x6e, 0x99
0x58, 0xde
0x6d, 0x44
0xd5, 0xf0

953:
0x02, 0x33

over 6 years ago

0 Hamzeh Jaradat over 6 years ago

TI__Guru** 108180 points

Hello,
for setting 954 GPIO0 as input and 953 GPIO3 as output, you need to write the following:
954: 0x4C = 0x01
0x0F = 0x01
0x6F = 0x00

953: 0x0D = 0x80
0x0E = 0x80

0 FL Y over 6 years ago in reply to Hamzeh Jaradat

Prodigy 160 points

Hi Hamzeh Jaradat,

Thanks for answer. Can you anser why need set 0x6F to 0x00?

0x6F is BC_GPIO_CTL1 which is the setting for TI954 GPIO3 and GPIO2. Is it right?

If so,we set 0x6F=0x00 will make TI953 GPIO0 to TI954 GPIO0 and TI953 GPIO0 toTI954 GPIO2. Is it right?

We want to set TI954 GPIO0 to TI953 GPIO3(Frame sync). So why we need set 0x6F(related with GIPI3and 2 not GPIO0).

Whether there is misunderstanding with 0x6F register? Help give more explain about TI954 GPIOx ->TI953 GPIOy.

Many thanks!

0 Hamzeh Jaradat over 6 years ago in reply to FL Y

TI__Guru** 108180 points

Hello FL Y,

you need to set 0x6F=0x00 and 0x0F = 0x01 to define GPIO0 as input from the 954 and direct the signal to Back channel GPIO3 which is the 953 GPIO3.

0 FL Y over 6 years ago in reply to Hamzeh Jaradat

Prodigy 160 points

Hi Hamzeh，

It is clear! And question is solved. Perfect! Appreciate!

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DS90UB954-Q1: TI954 and TI953 case