Browsing by Author "Ozkurt, O."

Now showing 1 - 2 of 2

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Partial bitstream protection for low-cost FPGAs with physical unclonable function, obfuscation, and dynamic partial self reconfiguration
(Elsevier, 2013-02) Gören, S.; Ozkurt, O.; Yildiz, A.; Uğurdağ, Hasan Fatih; Chakraborty, R. S.; Mukhopadhyay, D.; Electrical & Electronics Engineering; UĞURDAĞ, Hasan Fatih
This paper proposes a technique based on Physical Unclonable Functions (PUFs), obfuscation, and Dynamic Partial Self Reconfiguration (DPSR) to protect partial FPGA configuration bitstreams from cloning and reverse engineering. With the aid of this technique, we are able to do the equivalent of partial bitstream encryption on low-cost FPGAs, which is only featured on high-end FPGAs. Low-cost FPGAs do not even have built-in support for encrypted (full) bitstreams. Through DPSR, our PUF implementation does not steal real estate from the encrypted design. We also present a new DPSR flow for Xilinx FPGAs, which is difference-based but still allows modular design. It works regardless of the amount of difference between Partial Reconfiguration (PR) modules and is called DPSR-LD, where LD stands for Large-Difference. DPSR-LD is an enabler especially for Spartan-6 FPGA family, as Xilinx currently supports PR on Spartan-6 only through the difference-based flow and only for small differences. Our DPSR-LD also includes a controller that interfaces to the ICAP and can process compressed bitstreams. It is called ICAP+ and occupies only 1% of Spartan-6 slices.
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RImCom: raster-order image compressor for embedded video applications
(Springer International Publishing, 2017) Palaz, Okan; Uğurdağ, Hasan Fatih; Ozkurt, O.; Kertmen, B.; Donmez, F.; Electrical & Electronics Engineering; UĞURDAĞ, Hasan Fatih; Palaz, Okan
This paper presents a real-time, rate controlled, end-to-end (encoder and decoder) hardware solution for memory compression of raster-order video streams—named RImCom (short for Raster-order Image Compression). RImCom offers up to 3x compression that is either lossless or lossy at very reasonable PSNR values. The 180 nm ASIC implementation of RImCom achieves 28 fps at Ultra-HD resolution in the slow corner of synthesis. RImCom can match the fps of the state-of-the-art in the literature with 20 % less area or can achieve twice the fps with 55 % more area. Our FPGA implementation is the only end-to-end FPGA solution in the literature to achieve to this day over 60 fps at Full-HD resolution and to offer rate control. This work was motivated by video processing applications that require the previous frame(s) besides the current frame. When processing HD video streams, even when only one previous frame is required besides the current frame, a significant size and bandwidth of memory is needed. If the current frame is compressed on-the-fly with RImCom or a similar solution and stored on DRAM, and the previous frame is read from DRAM and decompressed with a small IP block, then the overall system cost, power consumption, and electromagnetic radiation are reduced.