How to use 3 feet extension cable for programming with USB TAP?

[alonboico]

I am trying to remote programming the MCU 56F8037.

[dynapb]

Hi Alon

Is it the ribbon cable that you are extending?

Can you give more details on the problem?

What happens when you try to program?

Some things to try:

1. Try shielded ribbon cable.  Probably with shield grounded only at your target DSC board.
2. Slow down the programming speed of the USB TAP as shown in the screenshot.  Maybe try 500 or keep going down until it is reliable.

Pete

[xiangjun_rong]

Hi, Alon,

I think you use a line driver component to enhance the digital driving capability for example  74VT244A or the other driver and open drain circuit, which are powered by 3.3V power supply. In detail, you can connect each  JTAG signal pin to 74VT244A so that the driving capability can be enhanced to enllarge the line length.

Hope it can help you

BR

Xiangjun Rong