Xilinx IP Ethernet AVB Endpoint v2.4 UG492 - Manual (Page 64)

64 www.xilinx.com Ethernet AVB Endpoint User Guide
UG492 September 21, 2010
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