
322 CHAPTER 7 / PROGRAMMABLE LOGIC DEVICES
FIGURE 7.26
Segment of a Xilinx 2000 series logic cell architecture showing configurable logic blocks (CLBs),
I/O blocks (IOBs), switching matrices, and vertical and horizontal interconnect lines. Source: The
Programmable Logic Data Book, 1994. Xilinx Inc., San Jose, CA 95124.
by other manufacturers, which differ significantly from those of Xilinx, require their own
dedicated software.
Though Xilinx no longer produces the series 2000 FPGAs, a general description of these
devices is useful to introduce the subject of FPGAs. Shown in Fig. 7.27 is the Xilinx series
2000 FPGA logic cell, which consists of a combinational ...