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https://docs.amd.com/v/u/en-US/xapp627 PicoBlaze-II 8-Bit Microcontroller for Virtex-II Series Devices (XAPP627) - XAPP627: "PicoBlaze-II... XAPP627: "PicoBlaze-II 8-Bit Microcontroller for Virtex-II Series Devices" v1.1 (02/03) ii bit microcontroller virtex series