hi , i have a probelm while i am using the DCM for clock mutiply. i am using single DCM for my virtex 2 pro device. i have two sub modules and a top module. i need to use DCM in all the 3 modules (2 sub modules and top module). so i invoked dcm and component instantiation in all the 3 modules. but i am facing the problem while i am mapping . its throwing the error... like error: ERROR:LIT - IPAD symbol "clk77p76" is driving more than one loads. IPAD can only drive a single IBUF or two IBUFDS. If you are using a BUF instead of an IBUF, it may have been simplified, please use an explicit IBUF instead. can my dcm clk cannnot drive more than 2 loads ..... regards srik
DCM CLK driving load problem
Started by ●July 14, 2007
Reply by ●July 14, 20072007-07-14
<ekavirsrikanth@gmail.com> wrote in message news:1184395776.985541.34040@j4g2000prf.googlegroups.com...> hi , > > i have a probelm while i am using the DCM for clock mutiply. i am > using single DCM for my virtex 2 pro device. i have two sub modules > and a top module. i need to use DCM in all the 3 modules (2 sub > modules and top module). so i invoked dcm and component instantiation > in all the 3 modules. but i am facing the problem while i am mapping . > its throwing the error... like > > error: ERROR:LIT - IPAD symbol "clk77p76" is driving more than one > loads. IPAD can only > drive a single IBUF or two IBUFDS. If you are using a BUF instead > of an > IBUF, it may have been simplified, please use an explicit IBUF > instead. > > can my dcm clk cannnot drive more than 2 loads ..... > > regards > srik >You only need to instantiate a DCM in the top module.