我使用EPM1270，并口JTAG下载，加电下载时

只看该作者 · 2007-11-19 10:35

总是
“Error: The instruction register length for the EPM1270T144 device at position 1 in the JTAG chain is unknown”
断电下载时，开始正常，中间有时
“Error: Can't Verify device number 1”
有时成功。
有知道原因的吗？？

另，时钟信号怎么定义才不会告警
“ Info: Assuming node "clk" is an undefined clock”

谢谢！

1万 · 2007-11-19 11:41

JTAG应该是要加电下载的，你还是检查一下硬件，是否连接正常。下载线是否正确。

再看看，能不能把芯片的型号检测出来。

对于时钟的定义，有一个选项，勾上就不会提示了。
如果时钟不高，你完全可以不用管它。

只看该作者 · 2007-11-19 11:15

只看该作者 · 2007-11-19 13:32

断电下载时

Info: Started Programmer operation at Mon Nov 19 13:27:28 2007
Info: Device 1 contains JTAG ID code 0x020A30DD
Info: Device 1 silicon ID is ALTERA04-1
Info: Erasing MAXII configuration device(s)
Info: Programming device(s)
Info: Performing verification of type Nominal on device(s)
Info: Successfully performed operation(s)
Info: Ended Programmer operation at Mon Nov 19 13:27:34 2007

此时，无法检测到JTAG chain

加电下载时

Info: Started Programmer operation at Mon Nov 19 13:31:41 2007
Info: Device 1 contains JTAG ID code 0x020A30DD
Error: Can't recognize silicon ID for device 1
Error: Operation failed
Info: Ended Programmer operation at Mon Nov 19 13:31:41 2007

此时，检测硬件可以检测到EPM1270的芯片