32-bit RISC VN1632

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The VN1632 Core is 32-bit microprocessor core developed by ICDREC based on the RISC (Reduced Instruction Set Computer) architecture. The main characteristics are the architecture of Harvard 32-bit RISC but with a five-stage pipeline, in which five successive instructions are loaded simultaneously in five different pipeline stages. As a result, five instructions are executed at the same time. This effectively improves the performance of the microprocessor. It has on-chip cache memory, in which instruction cache and data cache are separate.

The 32-bit microprocessor VN1632 was designed and developed based on the experiences accumulated by the success of other 8-bit microcontrollers. The challenge of this new task was not only the complexity, the larger scale of the 32-bit microprocessor, but to ensure the design originality, many new and hard issues have been studied and implemented: cache memory, prefetch buffer, write buffer, store buffer, bus interface, co-processor, etc

The design has been synthesized, simulated and fabricated using 0.13um IBM process. The result shows that this architecture works correctly with desired performance.



  • CPU’s features
    • Harvard RISC 5-stage pipeline architecture
    • Separate instruction cache and data cache
    • Built-in cache memory
    • 65 instructions
    • 32-bit instruction width
    • Multiply in only 2 clock cycles
    • Debug support with breakpoint
    • Synchronous design
  • Bus and Peripherals 
    • Advance High Performance Bus (AHB)
    • Advance Peripheral Bus (APB)
    • Memory controller: SDR-SDRAM, Mobile SDR-SDRAM, DDR-SDRAM, or Mobile DDR-SDRAM (LPDDR), SRAMs and FLASHes
    • General Purpose I/O (GPIO)
    • I2C, I2S
    • TIMER 1 and TIMER 2
    • UART1, UART2


Block diagram

Technical Characteristics

  • Process: IBM 0.13um, 8 metal layers
  • Core voltage: 1.2V
  • PAD voltage: 2.5V
  • Core size: 3560 x 3559 um2.
  • Chip size: 24 x 24 x 1.4 mm3, TQFP.
  • Number of pins: 176
  • Maximum system clock speed: 20 MHz
  • Power consumption: 30.6 mW