Mobiveil’s xSPI Controller unifies legacy SPI through Octal DDR flows, mapping external flash/PSRAM into system memory via AXI4/AHB-Lite for fast code-execute-in-place and data access. A custom protocol sequencer abstracts vendor command sets (Macronix, Winbond, Micron, Cypress/Infineon, Adesto, etc.) to simplify bring-up across multiple devices. Deliverables include synthesizable Verilog RTL, SV/UVM testbench, protocol checkers, and design/verification/synthesis guides. System-validated architecture with multiple chip-selects and outstanding-address support.