Xilinx LogiCORE IP Ethernet AVB Endpoint v2.4 User Manual page 64

Chapter 6: Ethernet AVB Endpoint Transmission
hiLimit
The general equation is:
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:
loLimit
The general equation is:
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:
64
hiLimitValue = 2000 x idleSlopeValue
hiLimitValue = 2000 x 6144 = 12288000
loLimitValue = 1518 x sendSlopeValue
loLimitValue = 1518 x 2048 = 3108864
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UG492 September 21, 2010