TAP-Isolator enables interference-free boundary scan applications

August 28, 2012 // By Julien Happich
The TAP-Isolator from Goepel electronic is a special module that improves interference immunity in serial scan operations.

The newly developed hardware was specifically designed for applications in critical signal environments needing potential isolation, enabling a complete galvanic insulation of the Test Access Port (TAP) transceiver from the target. The TAP-Isolator is a small stand-alone box that can be used as add-on hardware in each scan path. It separates the transceiver's primary TAP interface from the target’s secondary TAP interface, and is easily upgradable at any time. The potential isolation eliminates mutual interference between TAP transceiver and target. That means an increase in the functional safety of Boundary Scan applications such as interconnection test, PLD programming or Flash programming.
The unit can be operated on the secondary side with fixed or variable output voltage between 1.8 and 4.5V, and maximum transmission frequency of 70MHz. It supports all standard TAP signals (TCK, TMS, TDI, TDO) as well as the optional /TRST. The isolation hardware’s possible runtime delays when used with modern Boundary Scan systems such as Scanflex can be individually compensated per TAP by the integrated ADYCS technology.

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