Answers Database

9500, EZTAG: How many devices can JTAG cable program in a chain?


Record #1272

Product Family:  Hardware

Product Line:  Other

Problem Title:
9500, EZTAG:  How many devices can JTAG cable program in a chain?


Problem Description:
The limiting factor on the number devices which can be in the JTAG chain is the
drive capability of the TMS and TCK signals.


Solution 1:

Due to a 5KOhm pullup on the TMS pin, the maximum number of
devices which the current JTAG cable is capable of driving
is 7.





End of Record #1272