jtag working wih 2 processors in chain but not with 7

[bisal009]

Hi,

In my test setup, a digilent jtag cable is used for boundary scan and following are my observations.

1. if two ARC processors are connected in chain then am able to read/write to my memories through both the processors but if I will put seven processors in chain then through FIRST processor am not able to access the memories but with others its working fine.

2. but if I will use a ashling cable its working with both two and seven processor.

3. in 7 processor mode, when am changing the processor number from second to first am getting an ERROR that tap controller in logic reset state.

Questions:

1.Is it related to TMS? or the pull up used on TMS?

2.How much the strength of pull up should be?

Any help on this will be highly appreciated.

Regards,

Bisal Pati

bisal.pati@wdc.com

[jpeyron]

Hi @bisal009,

We do not have any information about the Arc processors. You will need to contact Synopsys. If this is a 2 wire scan chain than the value of the pull-up resistor may have something to do with this issue.

thank you,

Jon