JT 2154 ScanBridge

The JT 2154 is an experiment board based on National Semiconductor’s STA111 device, aimed at users looking to utilise addressable bridge/multiplexors within their designs, and thus set-up ‘system level’ JTAG access. The unit can also be  used in semi-permanent installations to expand the TAP (Test Access Port) count on JTAG Technologies controllers in order to address highly segmented designs. Built-in support for ScanBridge-type devices within ProVision allows easy set-up of TAP assignments and device addressing.


  • Use as 1:3 TAP multiplexor
  • Experimental platform for system-level JTAG
  • Features industry standard STA111 chip
  • Experiment with ScanBridge technology before committing to a design
  • Adds additional, addressable TAP ports to any test set-up
  • Pin-to pin connections with JTAG Technologies JT 21×7 pods or JT 3705/USB
  • Can be powered from the pod or own connection

Use the JT 2154 to multiply the TAPs from any JTAG Technologies boundary-scan controller or use as the basis for ScanBridge/system-level experimentation. Compact design allows for siting inside test interface/fixture.

  • Primary TAP in and TAP out connections for stream configurations
  • Three secondary-TAPs with LED activity indicators
  • Standard JTAG 10-way IDC connectors used
  • 64 address options via on board DIP switch
  • Dimensions 105L x 65W x 15H mm, weight 45 g

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