Spartan-6 FPGA SelectIO Resources User Guide 笔记1 可配置的阻抗

1.SPARTAN-6支持的LVDS电平标准3.3或者是2.5。

2.可编程的差分阻抗

 

　　　　NET <I/O_NAME> DIFF_TERM = "<TRUE/FALSE>";

3.

可编程的输出终端电阻OUT_TERM = UNTUNED_<25,50,75>
可编程的输入终端电阻IN_TERM = UNTUNED_SPLIT_<25,50,75>

Only  NONE (default), UNTUNED_50, or UNTUNED_75 are allowed for OUT_TERM when  VCCO is 1.2V or 1.5V in Bank 0 or Bank 2. In this case, UNTUNED_25 is not allowed.

Note: IN_TERM = UNTUNED_SPLIT_25 is not supported in Bank 0 and Bank 2 when these banks use 1.2V or 1.5V I/O standards (VCCO = 1.2V or 1.5V)