| XC3000 | XC4000E | XC4000X | XC5200 | XC9000 | Spartan | SpartanXL | Virtex |
|---|---|---|---|---|---|---|---|
| N/A | Primitive | Primitive | Primitive | N/A | N/A | N/A | N/A |
The MD2 input pad is connected to the Mode 2 (M2) input pin, which is used to determine the configuration mode on XC4000 and XC5200 devices. Following configuration, MD2 can be used as an input pad, but it must be connected through an IBUF to the user circuit. However, the user input signal must not interfere with the device configuration. XC5200 devices allow an MD2 pad to be used as an output pad; XC4000 devices do not. The IOB associated with it has no flip-flop or latch.
