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AM6442: PRU IEP performance data

Biao Li
Expert 6740 points

Part Number: AM6442

Tool/software:

Hi Expert,

Is there any performance data related to the 1588 timestamp of pru's iep, such as synchronization accuracy? In addition, can the iep timer be frequently obtained at intervals of us?

BR,

Biao

  • 0
    TI__Expert 6844 points

    Hi Biao, 

    Sorry for the delayed response. 

    IEP hardware timestamping accuracy = +/-4ns (for 250Mhz), +/-5ns (for 200Mhz), +/-3ns (for 333Mhz)
    1588 sync accuracy = +-20ns  - considering +/-8ns based on RGMII wire clock 125Mhz.
    IEP timer can be frequently called as long as you ensure:

    • 2 x 32 bit IEP reads (protect the reads using critical section). ICSS target is 32bit VBUS.
    • 32-bit overflow condition. Check this document
      • i2433: ICSS: Reading the 64-bit IEP timer does not have a lock MSW logic when LSW is read

    BR
    JC