MPC8548 Problem with Jumbo Packets

[diegomartin]

Hello!!

I have a problem sending larges UDP messages with a MPC8548.

After configuring all registers properly (i think), when i send a message with more than 2005 bytes, the message doesnt reache the PC who is waiting for.

I had to change the value of the following registers for this:

  - MAXFRM = 0x00002580 (9600 bytes)

 - MACCFG2 =0x00007105

 - Flags of packet: 0xBA82 (WRAP), 0x9A82 (without WRAP)

Any idea?

Thank you in advance,

Diego.

[Pavel]

See the eTSEC 55 chip erratum:

https://www.nxp.com/docs/en/errata/MPC8548ECE.pdf

See also the Table 14-38 in the Errata to MPC8548E Reference Manual, Rev. 2:

https://www.nxp.com/docs/en/reference-manual/MPC8548ERMAD.pdf

Have a great day,
Pavel Chubakov

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