AnsweredAssumed Answered

Maximum trace length for JTAG lines

Question asked by gaurav verma on Nov 17, 2019
Latest reply on Nov 20, 2019 by Yiping Wang



In our T1024 based custom design, there are two T1024 processor..... we are able to connect with one T1024 through JTAG but not with other.....


We have checked all JTAG lines, power supply etc for other processor but with no outcome....


One difference i found between layout of two processors is length of JTAG lines.... For working processor trace length is between 4504 mills to 5553 mills and for not working processor it is between 7045 mills to 7818 mills ....


Does trace length impact its operation even though i am operating at very low speed aprox 100-500 KHz ??


Is there any limitation with respect to the  maximum trance length for JTAG lines ?