External Pins

A task can access the pins of the FPGA. For example, a task may drive LEDs connected to the FPGA or it may be connected to an external device, such as an ADC or a DAC. The connection to external pins is made by adding std_logic or std_logic_vector ports to the task. These ports may be 'in', 'out', or 'inout'. There is no limit on the number of ports you may use, however you must be careful not to use pins that have already been allocated to the standard firmware.

Port attributes, such as pin location, standard, and so on, can be described in the UCF file or in the XCF file you create as part of the task.