Raven - RISC-V Microcontroller based on PicoRV32 Core

A full ASIC implementation for PicoRV32

• CPU core: PicoRV32 (RISC-V – source Clifford Wolf)

• Reference design: PicoSoC

• Firmware/Software: gcc (riscv32 cross-compiler to.hex file target)

• Components: UART (“simpleuart”), SPI memory controller (“spimemio"), Scratchpad SRAM memory, SPI flash memory (up to four channels

Description

Full-chip implementation of the PicoRV32 PicoSoC in X-Fab XH018. The raven chip contains two ADCs, a DAC, comparator, bandgap, RC oscillator, and over-temperature alarm, as well as 16 bits of general-purpose digital inputs/outputs. It is powered off of a single 3.3V supply and driven by a 5 to 12 MHz crystal. The core CPU clock speed is 8 times the crystal frequency.

Features

• 100 MHz clock rate

• Selectable clock source

• 16 channels GPIO

• 2 ADCs

• 1 DAC

• 1 Comparator

• Over-temperature alarm

• 100 kHz RC oscillator

• Selectable functions on GPIO outputs

• Selectable interrupts on GPIO inputs

Open Source Synthesis Toolchain: qflow

• Synthesis: yosys / ABC

• Static Timing Analysis: vesta

• Placement: graywolf

• Routing: qrouter

• Layout & DRC: magic

• LVS: netgen

• Verilog simulation: iverilog

• Cosimulation: ngspice and iverilog

• Mask generation: magic