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Xilinx XC9536XL CPLD (36 macrocells / 800 gates), available in 44PLCC/44TQFP/48CSBGA/64TQFP packages. The one we decapped was a 44TQFP. Note probe scrub marks from wafer test on unbonded pads.
Made on on a 350 nm 5-metal aluminum process, most likely by TSMC.