This document is about Analog Devices ADSP-21060 Technical Note, which introduces the possible contention of ADSP-21060 SPORT DTx pins.
This document addresses a technical inquiry regarding potential data contention on the DTx pins of Analog Devices ADSP-2106x SHARC DSPs when used in multichannel mode. The author questions if the timing specifications in the data sheet imply a 7 nanosecond overlap between adjacent channels, which could cause bus contention and device damage.
The analysis concludes that this contention is an artifact of worst-case data sheet specifications combining extreme process, voltage, and temperature conditions. Actual testing shows the overlap is minimal (0.20ns in the worst case) and unlikely to cause damage, as the SHARC drivers are designed to be robust against such conflicts.
The 7ns overlap is an artifact of data sheet specifications meant to cover all possible situations, not a real-world occurrence.
No, the risk of long-term damage from a 7ns conflict is significantly less than the risk of standard ESD damage.
Actual testing showed an overlap of only 0.20ns under extreme conditions of max temperature and opposite voltage extremes.