DS90UB953-Q1: MIPI and User rom data question

The maximum rate is 832Mbps/lane (also in 1/2 MIPI lanes).  Also, the device ID in 0x00 can be used to assign any valid I2C ID. Please download the latest 953 datasheet from the sdsace/ internal sharepoint.  

Dear Ankur Verma,

I'm looking at the  

and it says :

Supports 1,2 or 4 Lane

– Supports up to 830 Mbps per lane (4 lanes)

– Supports up to 1.5Gbps/lane (1 or 2 lanes)

So if 1 or 2 MIPI Lanes are used there is 1.5Gbps/lane support ?

How can I access the sdsace/ internal sharepoint?

Best Regards.

Please contact your local TI sales representative who would have access to the internal sharepoint and can provide information post NDA.

Dear Ankur,

we have TI NDA , and have the DS for DS90UB953. I asked the same questions our contact in TI and he pointed me to this forum.

1)In preview DS from this link www.ti.com/.../ds90ub953-q1.pdf

is says that if using 2 lanes the data rate per lane is 1.5Gbps.

Is this correct?

2)High Speed Data Out signals chapter of DS90UB953-Q1

There is a statement if the link is running at the 4Gbps the AC capacitor should be 33nF, but if the device is running at lower data rates a larger coupling capacitor will be required.

How can I calculate the capacitor for lower data rates? What is the connection between capacitor value and data rate?

Best Regards.

Hi,

1.) The data rate per lane can be up to 832 Mbps * 4 lanes = ~3.3Gbps. When you include header information like CRC, LV/FV, DC Balancing etc the effective video data bandwidth is reduced.

2.) The simplest thing for you to do is look at the datasheet of the deserializer you intend to use and use that recommended AC coupling capacitance. This AC coupling cap is largely being determined by the backward channel rate that will exist on the line, you don't want to fully attenuate it and lose bcc communication. So for example if you intended to link to a 954 you can use the 33nF cap as suggested, but if you were going to a 964 then using a 0.1uF cap would probably be better.

Regards,

Dear MIchael,

1) I understand that when I use 4 MIPI lanes on 953 that the max video bandwidth is 800Mbps/per lane * 4 = 3.2Gbps.

My question was if I use 1 MIPI lane on 953 is then the bandwidth in this one lane 1.5 Gbps as stated in this document www.ti.com/.../ds90ub953-q1.pdf ??

So my system consists of a image sensor that has one MIPI lane with speed of 1.2Gbps and this is connected to 953, and on other side is 954. Then the data trough the coax will be 1.2Gbps , what is lower than the 3.2Gbps and in this case as stated in DS of 953 the AC cap should be bigger if the data rate is lower.

2) Does the AC cap being determined by the BC rate and not the FC rate?

Best Regards.