DS90UB962-Q1: Conflicted spec for linerate.

Harry Shin1

Expert 6760 points

Part Number: DS90UB962-Q1

Hello team

I am reviewing datasheet of 962.

and I found some weird spec from datasheet and roadmap

1) roadmap shows " 962 doesn't support synchronous clocking mode.

but data sheet shows 962 can support synchronous mode

2) I understand 962 can support up to 3Gbps line rate from datasheet.

but REF clock range is 23~26MHz so that line rate would be 160XRef clock= over than 4Gbps.

this means this synchronous mode line rate 4Gbps is conflicted with 3Gbps spec.

and I also could see 4.16Gbps power data from 962 datasheet.

As I totally checked this device, this is same as 960 but this only has 1 CSI output port. Am I correct??

if so, this could work with 953 for 3.3Gbps CSI BW.

Could you pls help me understand 962 device functionality clearly??

Really thank for your support~

Thanks

over 4 years ago

0 Harry Shin1 over 4 years ago

TI__Expert 6760 points

1 more quick question.

mode_sel doesn't have information about synchronous clocking mode.

which one is sync or which one is async??

Thanks

0 Casey McCrea over 4 years ago in reply to Harry Shin1

TI__Guru** 103215 points

Hello Harry,

1. The roadmap slide picture is kind of confusing because it is showing two different parts with one block. 962 supports synchronous mode but 964 does not.

2. The "3Gbps" is just a way to differentiate the allowable CSI-2 throughput between the "4G" devices and the "3G" devices. It does not actually refer to the line rate of the FPD channel itself. Both 960 and 962 operate with a 4Gbps forward channel but 962 can support up to 2.528Gbps of CSI-2 data per input port, while 960 can support 3.3Gbps per input port of CSI-2 throughput. The 962 is designed to pair with 935 serializers with < 2.528Gbps of CSI-2 throughput or with 953 serializers with < 2.528Gbps CSI-2 throughput

3. Synchronous vs. non-synchronous mode is set in the serializer side. See the serializer datasheet for MODE strapping and configuration of synchronous vs. non synchronous

Best Regards,

Casey

0 Harry Shin1 over 4 years ago in reply to Casey McCrea

TI__Expert 6760 points

Hello Casey,

Thanks for clear answer.

I misunderstood it could support 3.3Gbps if line rate is 4G. now I understand it should be different story.

Can I have 1 more question for mode_sel of synchronous mode?

Yes. I know SER has mode for clocking mode option and I could see other DES like 936/954 have mode option for clocking mode as well.

so From your comment, I understand that 960/964/962 supports different clocking mode for each of 4CH SER. Am I correct??

if so, 2CH device like 936/954 doesn't support different clocking mode for each of 2CH SER??

because those DES datasheet shows mode option for non-synchronous and synchronous mode.

Could you pls help me know this clearly??

Thanks

+1 Casey McCrea over 4 years ago in reply to Harry Shin1

TI__Guru** 103215 points

Hello Harry,

960/962/954/936 all support both synchronous and non-synchronous operation and it is configurable for each RX port independently. The strap option sets the mode for all the RX ports as the same upon boot, and then if you want to have a mixed configuration, you would need to program the port mode individually using the registers. The strap for non-sync mode on 954/936 just sets the back channel rate for the DES to 10Mbps which is the requirement for non-sync mode. On the 960/962 there is no strap to set the back channel like this, so if you want to use non-sync mode, you strap the part to CSI-2 mode, and then adjust the back channel rate to 10Mbps through the registers after power up.

The 964 does not support synchronous mode since it only pairs with 933/913A which do not have any synchronous mode

Best Regards,

Casey

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DS90UB962-Q1: Conflicted spec for linerate.