Reference Signal Rate
x and y are the coordinates of the point where t he Differential line voltage becomes zero.
t1andt2arethetimevaluesforthedatapointsp1andp2.
NOTE. Low Speed and Full Speed Signals are acquired with single-ended probes that enable finding
theCross-OverVoltage.
NOTE. For High Speed devices, the signal is differential, Cross-Over voltage is zero and crossover time is
the interpolation of two data points at zero crossings.
Signal Rate
You can definethesignalrateforLoworFullspeedsignalsastheinverseoftheaveragebittimethatgives
the transmission rate of the USB2.0 signal. For high speed signals, the signal rate is defined as the inverse
of the av
erage bit time that gives the transmission rate of the Test_Packet.
The average signal ra
te is the calculated average of number of bits divided by sum of all periods.
178 TDSUSB2 Universal Serial Bus Measurements Package
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