The Fast Access Controller is a pre-engineered asset for microcontroller and ASIC/SoC designers aiming to enhance Design-for-Test and improve flash programming performance. This patented solution offers a rapid on-board memory programming pathway, especially for setups where memory modules connect through a 1149.1/JTAG bus. FAC optimizes programming, delivering swift operational efficiency and enhancing development cycles by bridging the interface connection between a device and its onboard FLASH module.