The following table lists the differential I/O standards supported by the XC3S1500-4FG676C device.
Table 1. Supported differential I/O standards.
Bus Low-Voltage Differential Signaling (2.5V)
Differential High-Speed Transceiver Logic (1.8V) Class II
Differential Stub Series Terminated Logic (2.5V) Class II
Lightning Data Transport (2.5V)
Low-Voltage Differential Signaling (2.5V)
Extended Low-Voltage Differential Signaling (2.5V)
Low-Voltage Positive Emitter-Coupled Logic (2.5V)
Reduced Swing Differential Signaling (2.5V)
DCI (Digitally Controlled Impedance) option is available in each case, with the exception of the following:
For more detailed information, refer to the Spartan-3 Generation FPGA User Guide (
ug331.pdf), available at www.xilinx.com.