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芯片是EP2C5Q208，我现在的板子上PIN-108是按照通用IO设计的，没接任何上下拉电阻，直接连接VGA接口的vsync，今天我弄了一个简单的测试程序，在fitter那一步出现一个错误：
Info: Fitter converted 3 user pins into dedicated programming pins
Info: Pin ~ASDO~ is reserved at location 1
Info: Pin ~nCSO~ is reserved at location 2
Info: Pin ~LVDS41p/nCEO~ is reserved at location 108
Warning: Reserve pin assignment ignored because of existing pin with name "vsync"
Error: Can't place node ~LVDS41p/nCEO~ in location 108 because location already occupied by node vsync
Error: Live I/O check failed
我看了一下EP2C5的DATASHEET，nCEO--“Output that drives low when device configuration is complete. During multi-device configuration, this pin feeds a subsequent device’s nCE pin and must be pulled high to Vccio by an external 10kΩ pull-up resistor. During single device configuration and for the last device in multi-device configuration, this pin can be used as an user I/O after configuration.”
这里有几个问题想问问大家
multi-device configuration和single device configuration指的是什么意思？
这里说配置之后可以作为用户IO使用，如何配置（quartus Ⅱ8.0），也就是说如何配置管脚的general function和special function？
谢谢大家啦！ |
阿莫论坛20周年了！感谢大家的支持与爱护！！
知道什么是神吗？其实神本来也是人，只不过神做了人做不到的事情 所以才成了神。 （头文字D, 杜汶泽）
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发表于 2010-10-16 14:20:05
楼主