DS90UB953-Q1: with DS90UB954-Q1 is it possible to set back-channel speed to 25 Mbps in synchronous mode?

Gabor Szakacs17

Part Number: DS90UB953-Q1
Other Parts Discussed in Thread: DS90UB954-Q1

The DS90UB954-Q1 has a register setting, "BC_FREQ_SELECT" bits of the BCC_CONFIG register, that can change the back-channel frequency to 25 Mbps instead of the default 50 Mbps in Synchronous mode. Is this setting usable with the DS90UB953-Q1 serializer? I did not find an equivalent setting in the register set for the DS90UB953-Q1. However in the data sheet I found in paragraph 7.3.3:

"The back channel frequency is programmable for operation with compatible deserializers."

Other than the MODE setting, I don't see a way to program the back channel frequency.

over 7 years ago

0 Palaniappan Manickam over 7 years ago

TI__Genius 10475 points

Hello,
Yes it is possible to set the backchannel frequency on the 954 to be 25 Mbps in synchronous mode by programming register 0x58[2:0]=101.

0 Gabor Szakacs17 over 7 years ago

Prodigy 160 points

I'm sorry, perhaps it wasn't clear in my original post. I have tried changing the setting you mentioned in the 954, but then I could not communicate with the 953 in serial mode. What I was asking is whether there was a setting in the 953 to make it compatible with the 954 working at 25 Mbps in synchronous mode.

0 Charley Cai over 7 years ago in reply to Gabor Szakacs17

TI__Genius 12866 points

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DS90UB953-Q1: with DS90UB954-Q1 is it possible to set back-channel speed to 25 Mbps in synchronous mode?