Reference EOP Width Calculation
Where:
SumWeights is the total number of bits in the p acket.
SumPeriod is the sum of all time periods between the cross overs.
C1 and C2 are the Cross-Over points.
Bittimeist
he difference of the time values of C2 and C1.
EOP Width Calculation
You can de fine the EOP width for Low o r Full speed signals as the width of the end-of-packet of
aUSB2.0s
ignal. For high speed signals, it is defined as the width of the end-of-packet pattern of a
Test_Packet.
EOP W
idth is calculated as shown b elow.
Where:
EOP1 and EOP2 are the data p oints on a USB2.0 signal crossing the Mean Cross-Over level. T he
Cross-Over level is the mean value of all crossovers in the USB2.0 packet.
TDSUSB2 Universal Serial Bus Measurements Package 179
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