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Xilinx Answer #3165 : XC4000EX/XL: Some BUFGEs (Eearly buffers) are faster than others
Xilinx Answer #2548 : FPGA Configuration: EXPRESS MODE Does Not Work in XC4000EX/XL/XLT FAMILIES.
Xilinx Answer #2530 : XC4000EX/XL: The 4000EX devices are bitstream compatible to their equivalent 4000XL devices
Xilinx Answer #2183 : 4000XL/4000EX switching characteristics (rise/fall)
Xilinx Answer #2059 : FPGA Configuration: Peripheral Configuration from MCS file causes error (EX/XL).
Xilinx Answer #1948 : xc4000EX cclk maximum frequency specification
Xilinx Answer #1795 : 4000E/EX: Can the BUFGLS, BUFGE, and BUFFCLK (4000X) and BUFGP and BUFGS (4000E) be driven with Internal Logic?
Xilinx Answer #1659 : XC4000E/EX/XL/XLT/XV: M1- TBUF net Delay 4000EX - Effect of the Pullup.
Xilinx Answer #1646 : 96 DATA BOOK: XC4000EX Program Data and Prom size (bits), p. 4-58
Xilinx Answer #1575 : XC4000XL: 1996 DATA BOOK: Page 4-24 table 10.Supported Source for XC4000-Series Device Inputs is incorrect
Xilinx Answer #1405 : DATABOOK 1996 Edition: Ambiguity regarding PG299 pins E5, E16, T5 and T16