我用的是ISE10.1版本，器件是SPARTAN3A-200A，配置采用从串slave serial mode，将生成的bin数据流通过mcu配置fpga。
在生成prom文件步骤时，target我分别选了（1）Xilinx PROM 和（3）3rd-Party SPI PROM，PROM file Format选了bin，生成后我打开bin文件看了数据流发现不一样，开头分别如下
方式（1）
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
0x55,0x99,0x0C,0x85,0x00,0xE0,0x04,0x00,0x8C,0x86,0x90,0x77,0xCC,0x84,0x3C,0xF0,
0x8C,0x85,0x00,0x91,0x8C,0x82,0xF4,0x00,0x8C,0x43,0x40,0x84,0x01,0xC9,0x0C,0x87,
0xFF,0xF3,0x0C,0x83,0x00,0x81,0x8C,0x81,0x10,0x81,0x4C,0x80,0x00,0xF8,0x4C,0x83,
0x00,0xA0,0x4C,0x87,0x00,0x20,0x4C,0x85,0x00,0x70,0x4C,0x86,0x00,0x00,0x4C,0x81,
0x00,0x00,0xCC,0x82,0x18,0x4F,0xCC,0x46,0x00,0x00,0x00,0x00,0x0C,0x44,0x00,0x00,
0x00,0x00,0x0C,0x85,0x00,0x80,0x0A,0x06,0x00,0x80,0xC4,0x45,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
方式（3）
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
0xAA,0x99,0x30,0xA1,0x00,0x07,0x20,0x00,0x31,0x61,0x09,0xEE,0x33,0x21,0x3C,0x0F,
0x31,0xA1,0x00,0x89,0x31,0x41,0x2F,0x00,0x31,0xC2,0x02,0x21,0x80,0x93,0x30,0xE1,
0xFF,0xCF,0x30,0xC1,0x00,0x81,0x31,0x81,0x08,0x81,0x32,0x01,0x00,0x1F,0x32,0xC1,
0x00,0x05,0x32,0xE1,0x00,0x04,0x32,0xA1,0x00,0x0E,0x32,0x61,0x00,0x00,0x32,0x81,
0x00,0x00,0x33,0x41,0x18,0xF2,0x33,0x62,0x00,0x00,0x00,0x00,0x30,0x22,0x00,0x00,
0x00,0x00,0x30,0xA1,0x00,0x01,0x50,0x60,0x00,0x01,0x23,0xA2,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,

我又看了bit文件的数据，发现和（3）是一致的，而且（3）中的0xAA，0x99也和spartan3A中描述的开头一致，数据流中也含有Device ID信息

我想请问为什么2种方法产生的bin文件不一致，从串模式应该使用哪种数据流配置器件？谢谢！