• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Subscribers 99 subscribers
  • Views 269 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

c66x bandwidth issue?

atower geng
Prodigy 245 points

Hi, experts:

    I am confused by the peripheral device' bandwidth, for examle, for the 6678, the datasheet say that SRIO has 1.24/2.5/3.125/5 GBaud speed, and the Gigabit Ethernet can up to 1000 Mbps. I want to know that the bandwidth for unidirection or bi-direction?

    Best Regards

         Gavin

  • 0
    TI__Mastermind 28085 points

    Hi Gavin,

    In C6678 SRIO interface has transmit and receive pins which are connected to second device. It is Differential point-to-point unidirectional bus.

    The SGMII connection to the GbE switch allows bidirectional communication between the SGMII module and the switch. For more information refer Gigabit Ethernet user guide.

    Thanks,

  • 0 in reply to Ganapathi Dhandapani95
    Prodigy 245 points

    Hi, Ganapathi

       Thank you for your reply.

        If I use SRIO for 1x and 3.125G, transmit and receive both work concurrently, can rx and tx throughput can both up to 2.5G(3.125*0.8) or only up to 1.25G(3.125*0.8/2)?

       

        Best Regards

             Gavin

  • 0 in reply to atower geng
    TI__Mastermind 28085 points

    Hi Gavin,

    It supports up to 1.25Gbps only.

    The RapidIO specification defines four different bandwidths for each differential pair of I/O signals: 1.25, 2.5, 3.125, and 5 Gbps. Due to 8-bit/10-bit encoding overhead, the effective data bandwidths per differential pair is 1, 2, 2.5, and 4 Gbps respectively. A 1x port is defined as one TX and one RX differential pair. A 4x port is a combination of four of these pairs.

    Thanks,