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DRA829J: Model selection

Rain Wang
Expert 1400 points

Part Number: DRA829J
Other Parts Discussed in Thread: DRA829

hi TI

There are several questions about dra829:

1. Ethernet switch interface, with 8 Macs?

2. If I want to expand to 32 Ethernet switches, is there a recommended scheme?

3. In addition to the 8-port switch, I also need one independent Ethernet interface as the WAN port and one independent Ethernet interface as the debugging port. Can I meet it?

4. I need a hard disk with an external SATA interface, but I can't find an interface that supports SATA. Is there a proposal for this?

5. Does it support VLAN division?

  • 0
    Expert 1400 points

    hi   

    any update?

  • 0
    TI__Intellectual 1510 points

    Hello.

    Sorry for the delay - this was assigned to me last week while I was on time bank.

    (1) DRA829 has two CPSW (common platform switch) modules. The MAIN domain CPSW9g and the MCU domain CPSW2g -- here the numbers are equal to the number of external ports + one for the host port interface. Hence the MAIN domain CPSW9g has 8 external ports and the MCU domain CPSW2g has 1 external port. 

    (2) . Do you have a diagram of your intended topology? Connecting 32 external switches isn't typical but is possible. Many combinations are possible depending on the interface specifics of the external switches. For example one could connect all 32 + DRA829 CPSW9g in a serial fashion wherein the DRA829 uses 1 MAC port to connect to the last external switch in the chain. Although I expect this is not ideal but that depends on the overall system requirements. Another option would be to connect 6 ports of the DRA829 CPSW9g to 6 external switches which are then fanned out to the remaining 32-6=26 external switches.

    (3) As indicated in (1) there is the option of using the MCU CPSW2g but note this is stand alone and not connected via hardware to the CSPW9g. Hence any switching between these would need to be done via software which is probably not what is desired. One suggestion is to dedicated one port of the CPSW9g for the WAN port and another for the debugging port. The CPSW9g forwarding rules are flexible so that, e.g., these ports only communicate with host port traffic.

    (4) There is no SATA peripheral on DRA829. Alternative options would be to use PCIe or USB.

    (5) Yes the CSPW is a VLAN aware switch and able to segregate flows based on VLAN.

    Regards,

    Martin