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Newbie touchtony
Newbie
6,668 Views
Registered: ‎08-15-2007

Spartan 3 and Chipscope

It is quite abnormal that when I implement certain controllers, such as DDR-1 controller, the chipscope will not work in my spartan-3 sc3s1000-fg676 chip.
 
sometimes it is even impossible to find the chipscope core either with usb download cable or parallel one.
other times the core could be found, however, all the signals captured were irregular and wrong. For example, the reset signal changed frequently while the chip still worked to send out signals as designed previously. Obviously, the real reset signal  in the chip stayed low or high as a constant one.
 
Can someone here help me out?
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