W2353EP Datasheet, PDF (4/6 Pages) Keysight Technologies – USB Compliance Test Bench

04 | Keysight | W2353EP/ET USB Compliance Test Bench - Data Sheet
Simulated Test Bench
The simulated test bench is composed of subcircuits, namely a USB transmitter, a channel, and
a USB receiver. The circuit runs under the pre-requisite ADS Channel Simulator in bit-by-bit
mode for time domain waveforms. The generic chip I/Os are represented by specially created
IBIS AMI models, but you can swap out one or both of these with IBIS AMI models that are
more specific to your design, such as those from an IC vendor that represent a specific IC I/O.
Likewise, any or all parts of the generic channel model cascade (consisting of the transmitter
package, circuit boards, connectors, receiver package) can be replaced with pre- or post-
layout models. For example, an electromagnetic (EM) field solver can be used to create an
S-parameter model of one of more lanes on the post-layout motherboard.
Waveform Bridge Script
Once the simulated testbench has been adopted to reflect your pre-manufacture design, the
Channel simulation runs writing the appropriate waveforms to the dataset. The Waveform
Bridge script is a post-processing step that takes waveforms in the data set and writes them to
a file that the Infiniium Compliance Test Application can parse.
Use with U7243B-1TP USB Compliance Test Application
The file that the Waveform Bridge writes can be read into the U7243B-1TP USB Compliance
Test Application for Infiniium 9000 and 90000 Series Oscilloscopes. This application is now
available with an offline/remote mode, meaning that it can run not only on live data from
an oscilloscope, but now also using stored (“offline”) data. In addition, you can now run the
application in “remote” mode meaning that it can run on any Windows PC (including the one
you run Advanced Design System (ADS) on), not just the PC embedded in the oscilloscope. In
this way you can be assured that the tests you run on the pre-manufacture design simulation
will be identical to the ones you will run when the prototype is subsequently manufactured.