DS90UB960-Q1: About MIPI's output data late of DS90UB960.

Hi Sugi,

The 960 CSI-2 transmitter can be configured to 400 Mbps, 800 Mbps, 1.2 Gbps, or 1.6 Gbps per data lane per port. The sum of the input bandwidths to be forwarded must be less than the output bandwidth, so you would need to select a speed that will fulfill this requirement. Can you provide the following information about your system so I can accurately determine what lane speed you will need?

• Image sensor parameters:
  • Horizontal active pixels
  • Vertical total lines 
  • Frame rate (Hz)
  • Bits per pixel
• Clock type (continuous or non-continuous clock)
• Forwarding mode (best effort round robin, basic synchronized, etc.) 

Regards,

Cindy

Hi Cindy,

Thank you for replying.

I answer your questions.

  Note: I answer about one camera. As you know there are 4 image sensors.

(Ans)
 mage sensor parameters:
   Horizontal active pixels ; 2472pxcels
   Vertical total lines ; 2064 lines
   Frame rate (Hz) ; 15fps
   Bits per pixel ; 12bit
 Clock type (continuous or non-continuous clock) 　; continuous
 Forwarding mode (best effort round robin, basic synchronized, etc.)
　　　;　I think may be "etc".
               I want to use DS90UB960-Q1 as only multiplexer. And I chose 1 image sensor with 1 output on DS90UB960-Q1.

               And I expect the MIPI signals pass through as same data rate on DS90UB960-Q1.

              Therefore, I expect 594Mbps/lane of DS90UB960-Q1's output.

 Could you please answer below questions.

  Q1) we showed the block diagram, can we set 594Mbps/lane of MIPI output at the DS90UB960?

  Q2) If we can't set that one of (Q1), how many data rate "one lane at one CH" of the DS90UB960?

  Q3) Can I use the DS90UB960-Q1 as only multiplexer?

Regards,
Shuichi Sugi.

Hi Cindy,

 Thank you for answering for us.

Cyndy said:
A1)You can only set the CSI-2 transmitter speed at certain rates, so 594Mbps is not possible (see section 7.4.19 in the 960 datasheet).

Sugi answered:
I understand by your explanation.

Cyndy said:
A2)Based on the parameters for the 4 image sensors, your total input bandwidth sum including CSI-2 overhead is about 3.67Gbps
--- skiped ---
just need to ensure that the input bandwidth sum is less than the output bandwidth.

Sugi answered:
I understand by your explanation. So, I'll set 800Gbps/Lane for TX setting.

Cyndy said:
A3)If I am understanding your diagram correctly, you want to select either RX port 0 or 1 to be outputted on CSI port 0, and select either RX port 2 or 3 to be outputted on CSI port 1?

Sugi answered:
I made more figure. Please see below figure.
In this case, I want to select either RX port 0 or 1 to be outputted on TX port 0, and select either RX port 2 or 3 to be outputted on TX port 1.
Do you understand what I explanation by my bad English?

We have more questions.

Q4) Our questions are about the relationship between the CIS signal of the serializer input and the deserializer output.

 Q4-1)
This is explained in the diagram above. Does a relationship correct between "A0, A1, A2" order on the CIS side and "A0, A1, A2" order of the DS90UB960 TX output?

 Q4-2)
And, does It also correct or incorrect about "C0, C1, C2"?

Q5)It's about the relationship between "Period of long packet" on CIS signal of the serializer input   and   "Period of long packet" on the deserializer TX output.

 Q5-1) Please see the below figure.
Can we get below timing chart, if we apply above block diagram and setting registers?

 Q5-2) Is below explanation correct or incorrect? 

In this case, my understanding is below. ”C period" is shorter than "A period". But "B period" and "A period" are same time. Because we think that the LPS period absorbs the difference between the two data rate. In fact, we need this timing.

Q6) About memory size.
How many amount of memory does equipped on the DS90UB960?
 Eg; About 1 Line's Size or about 1 Flame size.

Regards,

Shuichi Sugi.

Hi Cindy,

　I made a mistake figure last post. I'm sorry.

 Please change a  figure. I mistook a name of signal on time chart. It's output signal of DS90UB960 TX. 

 Regards,

Shuichi Sugi

Hi Shuichi,

No problem. I will be closing this thread, but feel free to start a new one if you have any more questions. 

Regards,

Cindy