Datasheets¶
Technical documentation for the BE-300's primary components. These manuals are the authoritative references for register layouts, timing requirements, and hardware behavior.
Processor¶
NEC VR4131 SoC User Manual¶
File: Vr4131-um_200203.pdf
The VR4131 is the main System-on-Chip in the BE-300. This manual covers:
- MIPS32 CPU core (instruction set, CP0 coprocessor, TLB, exceptions)
- Bus Control Unit (BCU)
- Interrupt Control Unit (ICU)
- Clock Management Unit (CMU)
- Power Management Unit (PMU)
- Real-Time Clock (RTC)
- General-purpose I/O Unit (GIU)
- Serial Interface Unit (SIU)
- PCI interface
Companion Chip¶
NEC VRC4173 Companion Chip User Manual¶
File: U14579EJ2V0UM00.pdf
The VRC4173 provides additional I/O peripherals connected to the VR4131 via the local bus:
- Interrupt controller (cascaded through VR4131 ICU)
- PS/2 keyboard/mouse interface
- Audio controller
- USB host controller
- Touchscreen (PIU)
- GPIO
- Power management
Casio Documentation¶
BE-300 Driver Design Guidelines¶
File: DriverDesignGuidlinesforBE-300.pdf
Casio's guidelines for writing device drivers for the BE-300 platform. Covers the OEM Adaptation Layer (OAL) interface, memory layout expectations, and peripheral access conventions.
BE-300 Main Board Schematic¶
File: be300-main-board.pdf
Board-level schematic of the BE-300 main PCB, showing connections between the VR4131, VRC4173, SDRAM, NAND flash, LCD, and other components. Sourced from jal0's hardware documentation efforts.