Do I have bus contention if I see 2.4v on a signal that should be near 3.3V or ground?
Maybe not. On some new SHARC products like ADSP-21467, there can be an unusual voltage on the signal pins with internal pullups. If the pullup controls the voltage, it is 2.4V. If a driver controls the voltage it is near 3.3V or near ground. 2.4V is a perfect logic high because Vih is 2.0V. It causes no error of any kind.
During debug, it can look to the customer like bus contention. When customers have circuit problems; they measure the voltage and see that 2.4V is not the 3 volts that they expected. It may look as if there is something wrong with their circuit. The 2.4V is normal, valid and expected for some processors.
Retrieving data ...