High-Speed PCAP Configuration Scrubbing on Zynq-7000 All Programmable SoCs

Configuration scrubbing is a technique used for repairing Single Event Upsets (SEUs) within the configuration memory of an FPGA. Scrubbing approaches have been developed using hardware external to the FPGA communicating through a configuration port and using hardware within the FPGA by communicating with an internal configuration port (ICAP). More recent FPGAs such as the Xilinx Zynq 7-Series SoCs provide internal programmable processors that can configure the FPGA logic very rapidly using an internal Processor Configuration Access Port (PCAP). These SoC/FPGAs also provide automatic internal scrubbing through the use of high-speed readback and configuration error correction. This paper presents a novel form of FPGA configuration scrubbing for the Zynq-7000 SoC family by combining the highspeed PCAP configuration port with internal scrubbing. This novel scrubber corrects single-bit upsets in several microseconds and detects these upsets in 8 ms.