Operating Basics Packet Parameter Measurement
7. Select the Run button.
8. To generate reports, select Utilities > Report Generator.
See Also
Generating Reports
Packet Parameter Measurement
Packet parameter measurement is for high speed Host controller and Device. There are several important
packet characteristics for upstream and downstream signaling. The measurement calculates the SYNC
field length, EOP length and inter packet gap. The acceptable range of EOP for all transmitted p ackets
(except S
OFs) must be between 7.5 and 8 .5 bits. The packet parameter algorithm calculates the EOP
depending on this range.
The acce
ptable range of inter packet gap is between 88 bits to 192 bits. The SYNC field for all transmitted
packets is calculated by counting the bits to check for 32-bit SYNC field. The inter packet delay and
SYNC status is calculated between the EOP indexes. The EOP width in time is calculated by dividing
theEOPwidthby480Mbps.
Suspend Measurement
This test calculates the time between the end of last SOF and the rising edge transition to Full-speed J state
for Host / Device / Hub- upstream. This time must be between 3mS and 3.125mS. To get the Suspend
signal, hot-plug the unit under test (device) and measure the signalling with single-ended probes on both
lines. The application analyzes data for the Suspend Time.
46 TDSUSB2 Universal Serial Bus Measurements Package
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