How does i.MX535 handle jumbo frames

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How does i.MX535 handle jumbo frames

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Contributor II

The reference manual in not real clear on this topic.  Does anyone have more details on how to handle Jumbo Frames and what the limitations are?

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NXP TechSupport
NXP TechSupport

The i.MX53 FEC supports the following :

If the transmit frame length exceeds MAX_FL bytes the BABT interrupt is

asserted: however, the entire frame is transmitted (no truncation).

  When the receive frame length exceeds MAX_FL bytes the BABR interrupt is generated,

and the LG bit in the end of frame RxBD is set. The frame is not truncated (unless the

frame length exceeds 2047 bytes).

   So, maximum length is 2047.

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NXP TechSupport
NXP TechSupport

The i.MX53 FEC supports the following :

If the transmit frame length exceeds MAX_FL bytes the BABT interrupt is

asserted: however, the entire frame is transmitted (no truncation).

  When the receive frame length exceeds MAX_FL bytes the BABR interrupt is generated,

and the LG bit in the end of frame RxBD is set. The frame is not truncated (unless the

frame length exceeds 2047 bytes).

   So, maximum length is 2047.

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Contributor II

Thanks, Yuri.  I ran this question by FSL as well and their reply was similar, i.e. 2047 is the limit.

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NXP TechSupport
NXP TechSupport

Besides the Reference Manual, I can olny said that you can take a look to the Linux  ENET driver of the i.Mx53. but I do not think we have more information besides that.

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