What is the strength of the internal pull-up or pull-down resistors in the Spartan-3 I/O block?
The strength of the internal pull-up and pull-down resistors is defined by the parameters Irpu and Irpd in the Spartan-3 FPGA Family Data Sheet (DS099), found at:
http://www.xilinx.com/support/documentation/data_sheets/ds099.pdf
To obtain the values of the pull-up and pull-down resistors, use following equation:
Pulldown resistor: Rrpd = Vcc / Irpd
Pullup resistor: Rrpu = Vcc / Irpu
| AR# 19024 | |
|---|---|
| Date | 01/28/2013 |
| Status | Active |
| Type | General Article |