DS90UB954-Q1: BC_FREQ_SELECT Issue

Amelie Zheng

Genius 10865 points

Part Number: DS90UB954-Q1

Hi Team,

My customer now use 954 and 913/953.

When with 30fps, BC_FREQ_SELECT =25M, display normally;BC_FREQ_SELECT =50M, the display flicker.

When with 60fps, BC_FREQ_SELECT =25M, can't display; BC_FREQ_SELECT =50M, display normally.

Why? if connected with 913/953, does customer need to choose 25M or 50M BCC?

over 5 years ago

0 Hamzeh Jaradat over 5 years ago

TI__Guru** 108010 points

Hello Amelie,

When paired with 913, customer needs to choose 2.5Mbps.

When paired with 953, customer needs to choose 50Mbps.

0 Amelie Zheng over 5 years ago in reply to Hamzeh Jaradat

TI__Genius 10865 points

Hi Hamzeh,

Thanks for you quickly response!

Because 954 support 2 channel input, customer use 913+953.

How could they configure it?

By the way, may I ask what kind of signal will BCC transfer?

0 Hamzeh Jaradat over 5 years ago in reply to Amelie Zheng

TI__Guru** 108010 points

Hello Amelie,

you need to choose the correct BC speed for each Port saperately. To do that you need to choose the correct RX Port number in register 0x4C.

BCC (Bidirectional Control Channel) contains all the I2C + GPIO + Synch Clock.

0 Amelie Zheng over 5 years ago in reply to Hamzeh Jaradat

TI__Genius 10865 points

Hi Hamzeh,

Thanks for your reply.

I would like to consult one more small question. How could customer configure their 953/954 to synchronous mode? Through 0x21[3:2] in 954?

0 Hamzeh Jaradat over 5 years ago in reply to Amelie Zheng

TI__Guru** 108010 points

Amelie,

Do you mean Synchronous forwarding of CSI data, or Synchronous Clocking mode via Back Channel?

0 Amelie Zheng over 5 years ago in reply to Hamzeh Jaradat

TI__Genius 10865 points

Hi Hamzeh,

Here means "Synchronous Clocking mode via Back Channel"

Thanks!

0 Hamzeh Jaradat over 5 years ago in reply to Amelie Zheng

TI__Guru** 108010 points

Normally this is configured via strapped value on MODE Pin, as per Table 2 in the d/s.

Nevertheless, this can also be changed in Register 0x58. They need to write 0x5E. And also in reg 0x6D[1:0] they need to Choose CSI mode.

0 Amelie Zheng over 5 years ago in reply to Hamzeh Jaradat

TI__Genius 10865 points

Got it and thanks!

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DS90UB954-Q1: BC_FREQ_SELECT Issue