Reference Packet Parameter Test Equipment Setup
High Speed Device:EL_21, EL_23, EL_25 (Sync-EOPIII-InterPacketII&III)
a. Complete procedures 1 and 3 to set up the oscilloscope.
b. The oscilloscope acquires and displays the waveform as shown in the next figure.
c. "Press OK when correct waveform is acquired”.
d. The applica
tion measures the synchronous bits (32) of the third packet. This is EL_21.
e. The application measures the EOP of the third packet (8bits). This is EL_25. As the signal is
differenti
al, the EOP can be a positive or a negative pulse.
f. The application measures the inter-packet gap between the second and the third packets
(88-192 bi
ts). This is EL_23 as shown in the next figure.
High Speed Device:EL_22 (InterPacketI&II)
a. Complete procedures 1 and 3 to set up the oscilloscope.
b. Se
lect the Step button in the HS electrical test tool to acquire the waveform as shown in the
next figure.
TDSUSB2 Universal Serial Bus Measurements Package 209
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