Requirements & Functional Specification

Requirements Specification

The aim of the project is the implementation of the Raspberry Pi’s RP2040 programmable I/O state machine (PIO) in an FPGA to help understanding this instance and general forms of programmable state machines. Driving a 64x64 RGB LED matrix could be optional illustrations of the PIO capabilities.

Functional Specification

• PIO original specification

• UART

Mandatory

• Compatibility to the Raspi PIO spec

  • Side-set

  • Program wrapping

  • Autopush and autopull

  • Clock dividers

  • Forced and EXEC’d instructions

  • Full instruction set JMP, WAIT, IN, OUT, PUSH, PULL, MOV, IRQ, SET

  • 4 state machines per PIO block

• 4 testing Programs

  • UART

  • SPI

  • Manchester encoded UART/Differential manchester (BMC) TX and RX

  • (I2C)

Optional:

• FIFO joining

• Multiple PIO blocks

• Full GPIO mapping support

• Additional PIO functions for common tasks

  • CRC calculation

  • Stuff bit counter

• Same timing/performance capabilities within the possible frequency range of the FPGA

• Video output via 64x64 RGB LED matrix

• Language and compiler for PIO assembly