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What is a boundary scan linker mux?

A boundary scan linker mux (multiplexer) device, also known as JTAG scan bridge or scan path linker, is a device that will be able to link or join multiple boundary scan chains into one single chain or multiple chain configurations depending on how the boundary scan linker mux device is configured.


See figure 1 below for a typical boundary scan linker mux connection.

 


 

Figure 1:  The boundary scan linker mux device U1 joins chain 1 (u2), chain 2 (U3,U4) and chain 3 (U5,U6, & U7).