There are many different JTAG cables available in the market, often they are not compatible to eachother.
The problem was cause by the software.
JTAG standard only defines a few hardware pinouts.
However there is no standard definition on the PC side, e.g.
which DB25 pin is for TDI?
This is really depending on the software, some JTAG softwares may assume TDI is connected to pin 2 of DB25, butothers may assume it is on pin 3.
Even for the JTAG connector side, there are many different pinouts,20 pin JTAG, 14 PIN, 12 PIN, 10 PIN etc...
in a nutshell, you need a JTAG cable/adapter is flexible enough to allow you configure it for different softwares/programmers so you only need to invest on one JTAG adapter.
What is our universal JTAG interface?
Our parallel universal JTAG adapter allows you to easily configure it to be a buffered or unbuffered JTAG.
With provided flexible jumper wire you can move the pin configuration easily to suit different programmers.
1) the cables use different data pins for the JTAG signals
