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- Article name
- Рroject code protection for ultrasonic medical devices, designed at PLIC of FPGA type, with the help of PRS generator
- Authors
- Gladky P. V., , cccp1983@mail.ru, Yaroslav-the-Wise Novgorod State University, Novgorod, Russia
- Keywords
- developments of ultrasonic medical scanners / protection / PLD (programmable logic device) / PRSG (pseudorandom sequence generator)
- Year
- 2010 Issue 1 Pages 67 - 73
- Code EDN
- Code DOI
- Abstract
- In designing and manufacturing practices of ultrasonic medical scanners the prevalent are programmable logic integrated chips (PLD) which represent combination of logic elements and memory located at the same chip. In this paper the author offers project protection mechanism realized at FPGA PLD, based on interaction of the mentioned PLD with PLD of CPLD type and providing the device nonoperation when the interaction does not meet a certain criterion. A good-enough solution is use of pseudorandom sequence generator (PRSG). For realization of protection mechanism it is offered to use two identical PRS generators (PRSG) simultaneously set in start state (by command from FPGA PLD) and clocked from the same clock generator. Outlets of these PRSG are combined per scheme excluding OR and locked at trigger clocked by frequency front of which is shifted relative to the frequency front clocking PRSG. Such solution will allow to avoid problems concerning time of propagation in scheme and to get stable level at trigger outlet when sequences of PRSG at FPGA and CPLD PLD are identical.
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