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最近看Stratix II GX Device Handbook关于FPP配置的时候,发现他在不同的地方对同一问题的叙述是自相矛盾的,整得人很郁闷。
如下:
P1311说:
If the fast passive parallel (FPP) scheme is used with the design security or
decompression feature, a 4× DCLK is required. This results in a slower configuration time when compared to the configuration time of an FPGA that has neither the design security, nor decompression feature enabled.
P1307:
Data indicates that compression typically reduces configuration
bit stream size by 35 to 55%.
从上面的叙述来看,应该是不压缩块一些,可是下面又这么说:
P1317:
FPP configuration using compression and an external host provides the
fastest method to configure Stratix II and Stratix II GX devices.
我的板子是用FLASH+CPLD来配FPGA的,到底是压缩块还是不压缩块,看了它的文档我就晕了。。。 |
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