P0800DG

描述

其次是精度高。TMS320C6713有三个因素影响着浮点格式的内在高精度。首先，浮点DSP的24位I／O字长在整数与实数值方面可实现比定点器件中常用的16位字长更高的精确度。第二，取幂大幅提高了应用可用的动态范围，较大的动态范围对处理极大数据集以及难以方便预计数据集范围的情况相当重要。第三，硬件内部的浮点数据表示法比定点器件更为精确，这就保证了最终结果的更高精确度。

SST39VF400A是SST公司推出的FLASH存储器。该器件十分适合用作外扩存储器，它的存储容量为4MB，采用3．3V单电源供电，因而无需额外提供高电压即可通过一些特殊的命令字序列来实现对各个子模块的读写和擦除，并可重复十万次以上，此外，还可通过I)SP编程来实现对它的读写操作，十分适合于系统的调试和开发。

1．2系统硬件接口设计

DSP访问片外存储器主要通过外部存储器接口(EMIF)完成。它不仪具有很强的接口能力(可以和各种存储器直接接口)，而且具有很高的数据吞吐能力(高达l200MB／s)。TMS320C6713的EMIF能支持8位、16位和32位宽的所有存储器，当从这些窄位宽的存储空间读写数据时，EMIF会将多个数据打包成一个32位的值，而不必增加额外电路。TMS320C6713与SST39VF400的接口电路设计如图1所示。该电路主要通过DSP的相关输出管脚来控制FLASH的擦除和读写。其中。A0～A19为地址线，DQ0～DQ15为数据线OE和WE分别为输出使能和写使能，CE1为片使能。由于TMS320C6713默认的引导模式是从外部CEl空间的16位FLASH来引导装载，所以，TMS320C6713的CEl和FLASH的片选CE相连。

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