Chapter 6: Ethernet AVB Endpoint Transmission

hiLimit

The general equation is:

hiLimitValue = 2000 x idleSlopeValue

In this general equation, the value of 2000 is obtained from the maximum number of bytes which may be present in legacy frames (an Envelope frame as defined in IEEE802.3 can be of size 2000 bytes).

In this example, dedicating up to 75% of the total bandwidth to the AV traffic, we obtain:

hiLimitValue = 2000 x 6144 = 12288000

loLimit

The general equation is:

loLimitValue = 1518 x sendSlopeValue

In this general equation, the value of 1518 is obtained from the maximum number of bytes which may be present in AV frames.

In this example, dedicating up to 75% of the total bandwidth to the AV traffic, we obtain:

loLimitValue = 1518 x 2048 = 3108864

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Ethernet AVB Endpoint User Guide

 

 

UG492 July 23, 2010

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Image 64
Xilinx UG492 manual HiLimit, LoLimit