120 www.xilinx.comSpartan-3A/3AN FPGA Starter Kit Board User GuideUG334 (v1.1) June 19, 2008Chapter 15: Expansion Connectors RHirose 100-Pin FX2 Edge Connector (J17)A 100-pin edge connector is located along the right edge of the board. This connector is aHirose FX2-100P-1.27DS header with 1.27 mm pitch. Throughout the documentation, thisconnector is called the FX2 connector.As shown in Figure 15-2, 43 FPGA I/O pins interface to the FX2 connector.Three signals are reserved primarily as clock signals between the board and FX2 connector,although all three connect to full I/O pins.Expansion Connector CompatibilityFor the majority of applications, the FX2 connector on the Spartan-3A/3AN Starter Kitboard is compatible with the other Xilinx development boards. The Spartan-3E Starter Kitboard and XC3S1600E Starter Kit board optionally provide limited differential I/Ocapability on the FX2 connector. The Spartan-3A/3AN Starter Kit board providesenhanced differential I/O support using the “Differential I/O Connectors,” page 124.• Spartan-3E Starter Kit boardwww.xilinx.com/s3estarter• XC3S1600E MicroBlaze Embedded Development Boardwww.xilinx.com/sp3e1600eFurthermore, the Spartan-3A/3AN Starter Kit board supports the other “FX2-ConnectorCompatible Boards,” page 122.Voltage Supplies to the ConnectorThe Spartan-3A/3AN Starter Kit board provides power to the Hirose 100-pin FX connectorand any attached board via two supplies (see Figure 15-2). The 5.0V supply provides avoltage source for any 5V logic on the attached board or alternately provides power to anyvoltage regulators on the attached board.Figure 15-2: FPGA Connections to the Hirose 100-Pin Edge ConnectorHirose 100-pin ExpansionConnector (J17)(See Table) FX2_IO<40:1>FPGA5.0V(M22) FX2_CLKIN(L22) FX2_CLKOUT(L21) FX2_CLKIO(See Table)(B.46)(A.47)(B.48)GNDUG334_c15_02_052407VCCO_012 (3.3V)
