Digital Circuits & Design, 1st Education by Pearson

11.44 | Chapter 11

11.5.9.4 | Configurable Logic Blocks

There are a number of CLBs in an FPGA organized as an array of rows and columns. The

logic blocks are connected to the I/O blocks through common row/column programmable

interconnects. The common row/column interconnects are known as global interconnects.

A logic block consists of a number of LMs. The LMs are the basic logic elements in a FPGA.

The LMs with in a CLB are connected through local programmable interconnects.

11.5.9.5 | Logic Module

A LM consists of an LUT, a D-type ip-op and a MUX. Most of the FPGAs are based on

4-input LUT. Figure 11.51 shows a block diagram of a LM with 4-input ...