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firstname.lastname@example.org posted a topic in Papilio OneHi, I am working with the Papilio one and the Logicstart wing. I am trying to follow the e-book "Introducing the Spartan 3E FPGA and VHDL" by Mike Field. I cannot get past the first project (chapter 6). I have modified the constraint file to: #Constraints for Papilio 1NET Switch_0 LOC = "P91" | IOSTANDARD = LVTTL;NET Switch_1 LOC = "P92" | IOSTANDARD = LVTTL;NET LED_0 LOC = "P5" | IOSTANDARD = LVTTL;NET LED_1 LOC = "P9" | IOSTANDARD = LVTTL; The LEDs do not respond to any of the switches. The LEDs are all off. All the segments of 7-segment display are lit. Quickstart-Papilio_One_500K-v1.5.bit works as expected. I suspect that there could be change in the mapping of the FPGA pins to the LEDs, switches, and 7-segments. If I could get the source for Quickstart-Papilio_One_500K-v1.5.bit, I could check if there is a problem with the mapping. Where could I get the VHDL source? Thanks, RM