[SOLVED] how J-tag ICP works ? and how to build one with USB?

[Ivan-Holm]

does someone know how to build an J-tag to Xilinx CPLD or FPGA from USB ? and how? schamatic.... simple schmatic.
ex. with FT 2xx family usb to serien Converter ???
all the document I find is with there own J-tag. does anyone Jtag works on Xilinx Jtag ??
can I program it with an PICKIT3 programmer for examble.
I have read the topic about Jtag here on edaboard but that only explain witch pin from RS-232 you shall use but not how see Jtag edaboard
sorry for my bad English.

links with xilinx refarance :
**broken link removed**
Xilinx JTAG Programming Cables
and Reference Schematics
**broken link removed**
Spartan-3 Generation
Configuration User
Guide

not xilinx Jtag
JTAG HISTORY

 

[avinash.kashyap]

...hey holm, did you check this out...
fischl.de - USBasp - USB programmer for Atmel AVR controllers

 

[Ivan-Holm]

and how do I program the ATMEGA in this Link you paste ??

 

[mrflibble]

You build one with the following ingredients:
- mouse click
- $40



I know it's not what you asked, but IMO building a jtag programmer is a big time waster. I used to do that myself, but these days there are enough cheap alternatives that DIY doesn't make much sense anymore.

The time you spend figuring out why the hell the trivial jtag thing is not working is better spent on figuring out why the hell your cool fpga design is not working. ;-)

Since your profile says you're from Denmark, so maybe this one is of interest:

**broken link removed**

hope that helps!

 

[avinash.kashyap]

and how do I program the ATMEGA in this Link you paste ??

...I meant that there are many programmer schematics provided on this page along with the firmware...or you can use mine...follow the link...
https://www.edaboard.com/threads/200935/

 

[Ivan-Holm]

thanks for all these suggestions I will Look at it.