ONE of my customer is trying to cennect his SPC5775E board with a mulit-link,getting the "not finding target errior", i give him a demo baord , he can connect the board with the muli-link .
i got his jtag sch as blow , he did not use the jcomp pin, i check the demo ,the deom board uses the pin .and he cut the jcomp line ,he can not connect the demo either.
will the all-pullup resistors disbale the jtag port?
must the jcomp be used for spc5775 ?
is thers any solution to use jtag if the jcomp is hidden blow the PGA chip?
Hello,
Please have a look at this document:
https://www.nxp.com/docs/en/application-note/AN4365.pdf
But basically on the devices with implements JCOMP is should to be connected to micro as the document describes, but it is not mandatory:
is thers any solution to use jtag if the jcomp is hidden blow the PGA chip?
You need to follow upper statement. So to enter the debug mode you have to:
JCOMP at 1, then you must ensure that TCK and TMS during not connected JTAG float. So you wont get into some unexpected state.
When you will have JCOMP at 0, then it wont work because JCOMP will hold whole JTAG in reset.
Hello,
Please have a look at this document:
https://www.nxp.com/docs/en/application-note/AN4365.pdf
But basically on the devices with implements JCOMP is should to be connected to micro as the document describes, but it is not mandatory:
is thers any solution to use jtag if the jcomp is hidden blow the PGA chip?
You need to follow upper statement. So to enter the debug mode you have to:
JCOMP at 1, then you must ensure that TCK and TMS during not connected JTAG float. So you wont get into some unexpected state.
When you will have JCOMP at 0, then it wont work because JCOMP will hold whole JTAG in reset.
