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8051 Compatible Microcontroller Core

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IP Type: 
IP Category: 
Embedded Processing
IP Description: 

The so_ip_8051M256 is a soft core of a single-chip 8-bit embedded microcontroller dedicated for operation with fast (on-chip) and slow (off-chip) memories.

So_ip_8051M256 soft core is 100% binary compatible with the industry standard 8051 microcontroller. It executes all ASM51 instructions and has the same instruction set as the 8031. The so_ip_8051M256 serves both software and hardware interrupts, and has standard peripheral units like timers and serial communication system.

So_ip_8051M256 has an advanced architecture that enables it to be 4.51 times faster than the original 8051 microcontroller.

So_ip_8051M256 is delivered with fully automated testbench and a compete set of tests allowing easy package validation at each stage of SoC design flow.

The so_ip_8051M256 is a microcode-free design developed for reuse in FPGA implementations. The design is strictly synchronous with positive-edge clocking, no internal tri-states and a synchronous reset.

Key features:

  • 100% software compatible with industry standard 8051
  • Advanced architecture enables to execute instructions on average 4.51 times faster compared to original 8051
  • 8 times faster multiplication
  • 8 times faster division
  • 4 times faster addition
  • 256 bytes of internal (on-chip) Data Memory
  • Up to 64K bytes of internal (on-chip) or external (off-chip) Program Memory
  • Up to 64K bytes of internal (on-chip) or external (off-chip) Data Memory
  • De-multiplexed Address/Data bus to allow easy connection to memory
  • Fully synthesizable synchronous design with positive edge clocking and no internal tri-states
  • Interrupt Controller
    • 2 priority levels
    • 2 external sources
    • 3 internal sources from peripherals
  • Four 8-bit I/O Ports
    • Separate input and output lines
    • Alternate port functions such as interrupts and serial interface are separated, providing extra port pins in comparison with original 8051
  • Two 16-bit timer/counters
    • Timers clocked by internal source
    • Auto reload 8-bit timers
    • Externally gated event counters
  • Full-duplex serial port
    • Synchronous mode, fixed baud rate
    • 8-bit asynchronous mode, variable baud rate
    • 9-bit asynchronous mode, fixed baud rate
    • 9-bit asynchronous mode, variable baud rate


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