84 www.xilinx.com Spartan-3A/3AN Starter Kit Board User GuideUG334 (v1.0) May 28, 2007Chapter 11: Parallel NOR Flash PROM RFlash ConnectionsTable 11-1 shows the connections between the FPGA and the Flash memory device.Although the XC3S700A/AN FPGA only requires just slightly over 2.6 Mbits peruncompressed configuration image, the FPGA-to-Flash interface on the board supports upto a 256 Mbit Flash. The Spartan-3A/3AN Starter Kit board ships with a 32 Mbit device.Address lines SF_A<25:22> are not used.In general, the Flash memory device connects to the FPGA to support Byte PeripheralInterface (BPI) configuration, as described in Table 11-1.Table 11-1: FPGA-to-Flash ConnectionsCategoryNOR FlashSignal NameFPGA PinNumber FunctionAddressNF_A25 G17 The upper four Flash addresses are not usedon the board. The board only has a 32 Mbitparallel NOR Flash PROM.NF_A24 G18NF_A23 B21NF_A22 B22NF_A21 C21 Connects to FPGA pins A[21:0] to supportthe BPI configuration.NF_A20 C22NF_A19 F21NF_A18 F22NF_A17 H20NF_A16 H21NF_A15 G22NF_A14 H22NF_A13 J20NF_A12 J21NF_A11 J22NF_A10 K22NF_A9 N17NF_A8 N18NF_A7 N19NF_A6 N20NF_A5 N21NF_A4 N22NF_A3 P18NF_A2 R19NF_A1 T18NF_A0 T17
