Reference Packet Parameter Test Equipment Setup
You can use the application to perform the following measurements:
High Speed Host: EL_21, EL_23, EL_25 (EOPII-InterPacketI&II)
a. Complete procedures 1 and 2 to set up the test fixture and the oscilloscope.
b. The oscilloscope acquires and displays the waveform as shown in the next figure.
c. "Press OK wh
en correct waveform is acquired”.
d. The application measures the synchronous bits (32) of the first and second packets. This
is EL_21.
e. The application measures the EOP of the second packet (8bits). This is EL_25. As the signal is
different
ial, the EOP can be a positive or a negative pulse.
f. The application measures the inter-packet gap of the first two packets (88-192 bits). This is
EL_23 as s
hown in the next figure.
TDSUSB2 Universal Serial Bus Measurements Package 205
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