2 Replies Latest reply on Sep 14, 2017 2:43 AM by ramzi.brahmi.94_2324711

    CX3 MIPI CSI2 throughput

    ramzi.brahmi.94_2324711

      According to CX3 TRM page 8 the bus between MIPI CSI2 and GPIF II is 24 bit wide and has a max clock of 100 MHz. Therefore maximum transfer bandwidth is 2.4 Gbps. On the other hand, page 2 states supported MIPI CSI2 bandwidth of 1 Gbps X 4 lanes = 4 Gbps. The question is, when using 4 MIPI CSI2 lanes, how more than 600Mbps per lane are supported?

        • 1. Re: CX3 MIPI CSI2 throughput
          keaj

          The maximum bandwidth that CX3 can support is limited by the GPIF II block of CX3. As mentioned in TRM it can support till 2.4Gbps. So if you want to use all the 4 lanes, then CX3 can support only 600Mbps/lane. Else the video will not stream properly due to data loss.

          On the other hand, if you are only using 2 lanes, then each lane can support up to 1Gbps.

          The bandwidth is not limited by the MIPI receiver, but by the GPIF II block inside CX3.

          • 2. Re: CX3 MIPI CSI2 throughput
            ramzi.brahmi.94_2324711

            Thanks for the confirmation, Keaj.

            Can you please escalate to the documentation team to correct the false claims of 4 Gbps?

            For example, here is a erroneous quote from CX3 TRM page 2:

            CX3 conforms to the MIPI CSI-2 specification (version 1.01) and supports up to four data lanes with speed

            up to 1 gigabits per second (Gbps) per lane for a total bandwidth of 4 Gbps.