The paper by Greene et al.  (reprinted in the 1994 Actel data book) is a good description of the Actel interconnect. The 1995 AT&T data book contains a very detailed account of the routing for the ORCA series of FPGAs, which is similar to the Xilinx LCA interconnect. You can learn a great deal about the details of the Lucent and Xilinx interconnect architecture from the AT&T data book. The Xilinx data book gives a good high-level overview of SRAM-based FPGA interconnect. The best way to learn about any FPGA interconnect is to use the software tools provided by the vendor. The Xilinx XACT editor that shows point-to-point routing delays on a graphical representation of the chip layout is an easy way to become familiar with the interconnect properties. The book by Brown et al. [
1992] covers FPGA interconnect from a theoretical point of view, concentrating on routing for LUT based FPGAs, and also describes specialized routing algorithms for FPGAs.
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