XC2C256 Data Sheets
VHDL Programming Hints for CPLDs

Spartan3E Data Sheeets

Spartan3E Starter Board User's Manual

XC2 XL Board Documentations

Spartan 3 Generation FPGA User's Guide      Data Sheets 

FX2BB Reference Manual

FX2 MIB
Reference Manual

Nexys Board Reference Manual             Schematic Diagram

Nexys 2 Board Reference Manual

82C55A Data Sheets