内存无法识别

大家好！
我正在使用spartan3AN，我正在尝试通过JTAG编程外部PROM xcf01s。
到目前为止，我们一直在使用没有外部存储器的PCB直接编程FPGA，一切正常。
现在，我们将PROM连接到pcb但是内存无法识别，当我尝试初始化链时指示未知设备。
引脚M2，M1，M1与gnd（主 - 串行模式）绑定。您认为这是硬件问题还是我必须通过ise设计套件和影响进行配置？
（我已经创建了一个PROM文件）JTAG-PROM-FPGA之间的连接是根据ug332，图3-2，第81页进行的。我还附上了pcb的原理图，以防我遗漏了什么。
（PROM在左下角，U5）。欢迎任何帮助。
SCHEMAtiC1 _ FPGA_USB.pdf 44 KB



以下为原文

Hello everyone! I'm using spartan3AN and i'm trying to program an external PROM xcf01s through JTAG.
Until now, we had been using the pcb without the external memory by programming directly the FPGA  and everything worked fine.
Now, we attached the PROM to the pcb but the memory is not recognized and when i try to initialize the chain indicates unknown device. Pins M2,M1,M1 are tied to gnd (master-serial mode).
Do you think it's a hardware problem or is it something else i have to configure through ise design suite and impact? (I have already created a PROM file)
The connection between JTAG-PROM-FPGA is being made according to ug332,figure 3-2,page 81.I've also attached the schematic of the pcb in case i'm missing something. (PROM is at lower left corner,U5).
Any help is welcome.
            SCHEMATIC1 _ FPGA_USB.pdf ‏44 KB