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| Element | XC3000 | XC4000E | XC4000X | XC5200 | XC9000 | Spartan | SpartanXL | Spartan2 | Virtex |
|---|---|---|---|---|---|---|---|---|---|
| IPAD | Primitive | Primitive | Primitive | Primitive | Primitive | Primitive | Primitive | Primitive | Primitive |
| IPAD4, IPAD8, IPAD16 | Macro | Macro | Macro | Macro | Macro | Macro | Macro | Macro | Macro |
IPAD, IPAD4, IPAD8, and IPAD16 are single and multiple input pads. The IPAD is a connection point from a device pin used for an input signal to the PLD device. It is connected internally to an input/output block (IOB), which is configured by the software as an IBUF, IFD, or ILD. Refer to the appropriate CAE tool interface user guide for details on assigning pin location and identification.
For Virtex and Spartan2, IPADs must be used to drive IBUF and IBUFG inputs. An IPAD can be inferred by NGDBUILD if one is missing on an IBUF or IBUFG input.
Note: The LOC attribute cannot be used on IPAD multiples.
Figure 6.49 IPAD8 Implementation XC3000, XC4000E, XC4000X, XC5200, XC9000, Spartan, SpartanXL, Spartan2, Virtex