Tektronix TDSUSB2, Руководство пользователя

Страница: 207 / 250

Measurement Algorithms
EOP Width Calculation
You can define the EOP width for Low or Full speed signals as the width of the
end-of-packet of a USB2.0 signal. For high speed signals, it is defined as the
width of the end-of-packet pattern of a Test_Packet.
EOP Width is calculated as shown below.
Where:
EOP1 and EOP2 are the data points on a USB2.0 signal crossing the Mean
Cross-Over level. The Cross-Over level is the mean value of all Cross-Overs in
the USB2.0 packet.
TDSUSB2 Universal Serial Bus Measurement Package 193