ISE调试

ISE调试的时候，不能光看tcl consetle，里面的叙述不全的，需要进到工程文件夹找到对应的文件，打开查看。像在map过程出错，可以查看*.map和*.mrp文件。

像在ISE窗口显示出来的是：

ERROR:Place:864 - Incompatible IOB's are locked to the same bank 1
   Conflicting IO Standards are:
   IO Standard 1: Name = LVCMOS33, VREF = NR, VCCO = 3.30, TERM = NONE, DIR =
   OUTPUT, DRIVE_STR = 12
   List of locked IOB's:
       VCC1P8_EN1_p
       PHY_RST_np
       UCD9222_ENA1_p
       UCD9222_ENA2_p
       SYS_PGOOD_p
       UCD9222_RST_np
       PCA9306_EN_p
       VCC1P5_EN_p
       VCC2P5_EN_p

查看了这几个信号都没有问题。

但是在map文件中显示的是：

ERROR:Place:864 - Incompatible IOB's are locked to the same bank 1
   Conflicting IO Standards are:
   IO Standard 1: Name = LVCMOS33, VREF = NR, VCCO = 3.30, TERM = NONE, DIR =
   OUTPUT, DRIVE_STR = 12
   List of locked IOB's:
       VCC1P8_EN1_p
       PHY_RST_np
       UCD9222_ENA1_p
       UCD9222_ENA2_p
       SYS_PGOOD_p
       UCD9222_RST_np
       PCA9306_EN_p
       VCC1P5_EN_p
       VCC2P5_EN_p

   IO Standard 2: Name = LVCMOS18, VREF = NR, VCCO = 1.80, TERM = NONE, DIR =
   OUTPUT, DRIVE_STR = 8
   List of locked IOB's:
       DSP_SSPMISO_p

   These IO Standards are incompatible due to VCCO mismatch.

然后就可以定位到问题在于：DSP_SSPMISO_p这个信号