Introduction

The Baochip-1x is an SoC with enhanced open source and security features. Fabricated in TSMC22ULL, it has a 350MHz Vexriscv RV32-IMAC CPU with Sv39 (virtual memory) support, along with 2MiB of integrated SRAM and 4MiB of integrated RRAM. RRAM is non-volatile memory analogous to FLASH.

The full part number is BAO1X2S4F-WA, but the part is referred to as the “Baochip-1x” or the “bao1x” interchangeably.

This book is a work in progress.

Please join the Discord to request sections, or open a pull request to make edits and contributions. See RTL for where to find the source code for the chip.

Potential Topics

Below is a list of potential topics for supplemental documentation. Note that many of the sections already have sample code in xous-core, and all the sections already have automatically-extracted documentation (Peripherals, CPU) with embedded links to the chip source code.

• clock generator
• PLL
• UDMA
  • UART
  • SPIM
  • I2C
  • SDIO
  • Camera
• Cryptoprocessors
  • SCERAM
  • Global setup
  • SDMA
  • Hash processor
  • PKE
  • AES
  • RNG
  • ALU
  • Sensors & countermeasures
• ATimer
• Always-on domain
• Power management & control
• RTC
• Keypad controller
• PWM
• Reset controller
• Interrupts/events
• CPU
• SRAM
• ReRAM
• watchdog timer
• DUART