Low Latency 40-Gbps Ethernet IP Core Release Notes

ID 683636
Date 7/07/2017
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1.1. Low Latency 40-Gbps Ethernet IP Core v16.1

Table 1.  Version 16.1 October 2016
Description Impact Notes
Enhanced malformed packet handling.

The IP core now ignores standard flow control pause packets if they are runt packets or have FCS errors. This change does not affect the IP core's handling of priority-based flow control packets.

The IP core potentially exhibits a behavior change. If you turn on standard flow control, the IP core might not process some incoming pause packets that it would previously have processed. The IP core continues to forward or drop these packets according to the setting in the RX_PAUSE_FWD register at offset 0x706. Change required for UNH compliance.
Added new option for strict SFD checking.

The IP provides a new parameter Enable strict SFD checking. If you turn on this parameter, the IP core checks the SFD and preamble bytes in all incoming packets for the following values:

  • SFD = 0xD5
  • Preamble = 0x555555555555
Whether you turn on this parameter or not, the IP core checks for a correct Start byte (Start = 0xFB).
The IP core potentially exhibits a behavior change. If you turn on the new parameter, the IP core might reject some incoming packets that it would previously have processed. Change required for UNH compliance.

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