Perhaps, the /RS pin of the CPLD is shared with other functionalities such as IO port(This is the case in EPM1270). So you should check for your CPLD unused pins, disabling options like \"Unused pins as output, pulled to ground\", and enabling \"Unused pins as input, tri-stated\" if you do not need this reset signal. Another way is to dedicate the /RS pin as a global reset pin by checking the option\"Enable device-wide reset\".
Wish this could help.
[ 本贴由 xialixun 于 2007-8-14 03:15 PM 最后编辑 ]
[ 本贴由 xialixun 于 2007-8-14 03:19 PM 最后编辑 ]
详情回复
发表于 2008-8-13 07:14
Perhaps, the /RS pin of the CPLD is shared with other functionalities such as IO port(This is the case in EPM1270). So you should check for your CPLD unused pins, disabling options like \"Unused pins as output, pulled to ground\", and enabling \"Unused pins as input, tri-stated\" if you do not need this reset signal. Another way is to dedicate the /RS pin as a global reset pin by checking the option\"Enable device-wide reset\".