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AR# 19024

Spartan-3 - What is the strength of the internal pull-up or pull-down resistors in the Spartan-3 I/O block?

Description

What is the strength of the internal pull-up or pull-down resistors in the Spartan-3 I/O block?

Solution

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 Created 09/03/2007
Last Updated 01/28/2013
Status Active
Type General Article