General-Purpose I/O (GPIO) Core

Description

The GPIO IP core is user-programmable general-purpose I/O controller. Its use is to implement functions that are not implemented with the dedicated controllers in a system and require simple input and/or output software controlled signals.

Features

The following lists the main features of GPIO IP core: - Number of general-purpose I/O signals is user selectable and can be in range from 1 to 32. For more I/Os several GPIO cores can be used in parallel. - All general-purpose I/O signals can be bi-directional (external bi-directional I/O cells are required in this case). - All general-purpose I/O signals can be three-stated or open-drain enabled (external three-state or open-drain I/O cells are required in this case). - General-purpose I/O signals programmed as inputs can cause interrupt to the CPU. - General-purpose I/O signals programmed as inputs can be registered at raising edge of system clock or at user programmed edge of external clock. - All general-purpose I/O signals are programmed as inputs at hardware reset. - Auxiliary inputs to GPIO core to bypass outputs from RGPIO_OUT register. - Alternative input reference clock signal from external interface. - WISHBONE SoC Interconnection Rev. B compliant interface More information about the WISHBONE SoC and a full specification can be found here. For further information, questions and general discussions related to the GPIO core, please visit the Cores Mailing list.

Status

- verilog RTL and verification suite are finished (see Downloads section)
- specification document is finished (see Downloads section)