本帖最后由 edacsoft 于 2011-11-4 17:24 编辑
1、为什么有的外设（比如LED，就4个）地址空间也那么大，有64K？EDK自动生成的。
原因在文档“EDK Concepts, Tools, and Techniques”说的很清楚：
If it seems strange for a simple peripheral to be assigned a 64Kbyte address space, don’t worry. A wider address space requires decoding of fewer address lines. In an FPGA, a decoder with many inputs is implemented as a cascade of lookup tables.The deeper the cascade, the slower the operating frequency. By assigning wide peripheral address ranges, the resulting FPGA implementation will run faster.
猴哥尽然都不知道，哈哈。
GOOD LUCK！
|
楼主
