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AM2432: SROTE_G device, 65 bytes are being read from RXL2 with xin

hiroyasu-shimizu
Intellectual 490 points
Part Number: AM2432

［日本語］

　xinにてRXL2の実装するバッファ量(64byte)を超えて読み込んでいるが理由を教えてください。

［English］

　Please tell me the reason why xin is reading more than the buffer capacity (64 bytes) implemented by RXL2.

  • 0
    TI__Expert 5260 points

    Hi Shimizu-san,

    RX L2 has information as following (please refer to the TRM for additional details)

    - R2 to R9: 32 bytes of data

    - R10 to R13: Status information for those 32 bytes

    - R18.b0: Current write pointer of RX L2 ring buffer

    With the single XIN, we get the above information into the PRU register with one cycle. So only 32 bytes Ethernet data + 16 Bytes status + 1 byte ring buffer pointer. The data from R14 to R17 is also fetched but shows up as 0.

    Regards,

     Thomas