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Founded in 1983, lattice semiconductor company is a company that designs, develops and sells high-performance programmable logic devices and related system development software. Since the invention of the first ISP (in system programmable) PLD in 1992, lattice semiconductor company has been a leading supplier of such devices. At present, there are more than 300 ISP products with different performance, package and temperature range. Generally, the standard PLD device requires 12V programming signal, so when writing, it must be removed from the printed board and special hardware equipment should be used. ISP devices use 5V or 3.3V programming signals, so they do not need to be removed from the circuit board when writing, so they can shorten the design cycle, reduce the production cost, and provide data files through computer disks and serial data lines to realize simple and low-cost field reorganization. In addition, lattice semiconductor company also provides ISP software development tools for users. Its latest software development tool is ispexpress, which runs on PC and UNIX platforms. Users can input, verify and debug design programs, carry out logic simulation, time domain analysis and ISP device programming. It's very powerful.