SNLA416A September   2022  – February 2024 DS90UB960-Q1 , HD3SS3212-Q1

 

  1.   1
  2.   Abstract
  3. 1Market Need
  4. 2Multiplexing FPD-Link Scheme
  5. 3Multiplexing Execution and Setup
  6. 4Implementation of Switching Protocol
  7. 5Assessing Impact on Signal Integrity
    1. 5.1 Return Loss
    2. 5.2 Insertion Loss
  8. 6Margin Analysis
  9. 7Conclusion
  10. 8References

3 Multiplexing Execution and Setup

The setup for multiplexing with the previously-mentioned FPD-Link is executed as follows. A DS90UB960-Q1 EVM was modified with multiplexing capabilities on one out of four channels using a high-speed, bidirectional multiplexer, HD3SS3212-Q1. DS90UB960-Q1 is a quad 2MP camera hub FPD-Link III deserializer device with dual CSI-2 output ports. HD3SS3212-Q1 is a two-channel differential 2:1 and 1:2 multiplexing and demultiplexing device that operates at up to 10Gbps. A single mini-FAKRA connector was added in addition to the quad FAKRA connector for the additional fifth camera input. For implementing the multi-camera application in Vision Apps, five TIDA-02002 modules using an IMX390 imager were used in conjunction with this board. Figure 3-1 and Figure 3-2 show the layout for this board.

GUID-20230911-SS0I-BTQK-MPHJ-GDRH5BM2SHRR-low.png Figure 3-1 Multiplexing Board Layout - Top View
GUID-20230911-SS0I-MJNM-BLCL-6M8D57JSNW1M-low.png Figure 3-2 Multiplexing Board Layout - Bottom

The MUX board has a SAMTEC CSI-2 connector that interfaces with a TDA4VM (J721EXSOMG01EVM) SOM board mounted on the J721EXCPXEVM common processor board for Jacinto 7 processors. The interface with the TDA4VM allows for camera output to be seen on a connected monitor. To switch between cameras, switching protocol functionality must be added to the TDA4 in the Software Development Kit (SDK).