Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

an error occurs during configuration（nSTATUS)

Hello all， Please help! We have a problem with cyclone III during configuration。My fpga used in AS and JTAG modes ,all the configuration pins are connected to the GND or VCC through ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

These problem has been solved,thanks~!

1、I don't try to program it in JTAG mode again for a period of time.Because I think the nSTATUS signal is not right. But to my surprise ,when I try program again ,it can be programed in JTAG mode now! Befor programed in JTAGmode, the nSTATUS is pulled low and high in cycles.After I program it in JTAG mode ,nSTATUS is pulled high steady.

2.Although , the AS mode still can't used at all. As the JTAG mode is right, I doubt the problem is occurs by EPCS16 . Erenow, I had replaced the EPCS16 by new ones for three times! Now, I decide replace the EPCS16 by a old one which had been used in other board. It can be work!!! Are the new EPCS16 I bought bad ???