Spartan-3A/3AN FPGA Starter Kit Board User Guidewww.xilinx.com 129UG334 (v1.1) June 19, 2008Six-Pin Accessory HeadersRSix-Pin Accessory HeadersThe six-pin accessory headers provide easy I/O interface expansion using the variousDigilent Peripheral Modules.J18 HeaderThe J18 header, shown in Figure 15-8, is located in the bottom right corner of the board,along the right edge, adjacent to the BTN_EAST push button. It uses a female six-pin 90°socket. Four FPGA pins connect to the J18 header, J18_IO<4:1>. The board supplies 3.3V tothe accessory board mounted in the J18 socket on the bottom pin.J19 HeaderThe J19 header, shown in Figure 15-9, is left unpopulated on the board. Four FPGA pinsconnect to the J19 header, J19_IO<4:1>. The board supplies 3.3V to the accessory boardmounted in the J19 socket on the bottom pin.Figure 15-8: FPGA Connections to the J18 Accessory HeaderJ18(AA21) J18_IO1(AB21) J18_IO2(AA19)(AB19)FPGAGND3.3VJ18_IO3J18_IO4UG334_c15_08_052407Figure 15-9: FPGA Connections to the J19 Accessory HeaderJ19(Y18) J19_IO1(W18) J19_IO2(V17) J19_IO3(W17) J19_IO4FPGAGND3.3VUG334_c15_09_052407These pins connect to unpopulated mounting holes.
