On Saturday 17 July 2010 13:05:44 Yanjun Luo wrote: > Use 4 single bit buffers.
The buffer you use is unidirectional, and one of the signals (TDI or TDO, check with the JTAG spec and the Spartan 6 documentation) goes in the opposite direction (device to JTAG cable). You should put the buffer in the opposite direction for this signal. When powered with 3.3V, the buffer can probably recognize the 2.5V from JTAG as a high level (see p.4 of the buffer datasheet). Sébastien _______________________________________________ http://lists.milkymist.org/listinfo.cgi/devel-milkymist.org IRC: #milkym...@freenode Webchat: www.milkymist.org/irc.html Wiki: www.milkymist.org/wiki
