Quantum Data 881 - Manual (Page 396)

378 Chapter 11 CEC Interactive Troubleshooting Environment (ITE)
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7. Monitor the timing parameters of the affected commands using the ACA. Refer
to “ To monitor the CEC bus (channel): ” on page 492 for instructions on monitoring the
commands through the ACA.
Bus arbitration tests
You can test a device’s response to arbitration errors through the command line. There are
three arbitration tests that you can perform:
• Force a connected device to stop sending.
• Force a device’s address to 0 to cause a sending device to stop sending.
• Force a bit of a sending device to go low when it should not be. This results in a
corrupted bit and simulates a device accidently sending on the bus.
Bus arbitration tests involves sending a command to cause the device under test to try and
seize the bus while also seizing the bus by the emulated device. This simulates a condition
where two devices may start sending at the same time which means they try and seize the
bus at the same time. When the device under test detects that another device is seizing
the bus it should send a low signal (force the bus low) to indicate to other devices (the
device emulated by the 880) that it (the device under test) has detected an error.