Цитата(stdio @ Sep 21 2006, 11:55)
Кто использует ПЛИС Spartan2 подскажите пожалуйста поддерживает ли она 5 вольтовые входные сигналы и нет ли при этом каких либо подводных камней?
Spartan-II 2.5V FPGA Family:
DCand Switching Characteristics
4. Spartan-II I/Os are 5V Tolerant whenever the LVTTL, LVCMOS2, or PCI33_5 signal standard has been selected. With 5V Tolerant
I/Os selected, the Maximum DC overshoot must be limited to either +5.5V or 10 mA, and undershoot must be limited to either –0.5V
or 10 mA, whichever is easier to achieve. The Maximum AC conditions are as follows: The device pins may undershoot to –2.0V or
overshoot to +7.0V, provided this over/undershoot lasts no more than 11 ns with a forcing current no greater than 100 mA.
5. Without 5V Tolerant I/Os selected, the Maximum DC overshoot must be limited to either VCCO + 0.5V or 10 mA, and undershoot
must be limited to –0.5V or 10 mA, whichever is easier to achieve. The Maximum AC conditions are as follows: The device pins may
undershoot to –2.0V or overshoot to VCCO + 2.0V, provided this over/undershoot lasts no more than 11 ns with a forcing current no
greater than 100 mA.
/Gr.
Spartan2 и 5-и волтьовая логика
Sep 21 2006, 07:55
