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    80251 IP

    OverviewFeaturesRequest Datasheet


    The DQ80251 is a revolutionary Quad-Pipelined ultra high performance, speed optimized soft core of a 16-bit/32-bit embedded microcontroller. The core is fully configurable and allows selection of its features and peripherals, to create a dedicated system. It has been designed with a special concern of performance to power consumption ratio. This ratio is extended by an advanced power management PMU unit. This product is built based on 14 years of know-how, with triumphant 8051 architectures. The DQ80251 soft core is 100% binary-compatible with industry standard 16-bit 80C251 and 8-bit 80C51 microcontrollers. There are two working modes of the DQ80251: BINARY (where the original 80C51 compiled code is executed) and SOURCE (a native 80C251 mode, using all DQ80251 performance). The DQ80251 has a built-in, configurable DoCD-JTAG on chip debugger, supporting Keil DK251 and standalone DoCD debug software. Dhrystone 2.1 benchmark program runs 66 times faster than the original 80C51 and 5.5 times faster, than the original 80C251 at the same frequency. This performance can be also exploited to great advantage in low power applications, where the core can be clocked over fifty times slower than the original implementation, with no performance penalty. Additionally, the compiled code size for the SOURCE mode is about 2 times smaller comparing to the identical standard 8051 code, due to higher efficiency of DQ80251 instructions. The DQ80251 is delivered with fully automated testbench and complete set of tests, allowing easy package validation at each stage of SoC design flow.

    Each of our 80251 cores has a built-in support for Hardware Debug System, called DoCDTM. It is a real-time hardware debugger, which provides debugging capability of a whole System on Chip (SoC).

    Unlike other on-chip debuggers, the DoCDTM provides non-intrusive debugging of running application. It can halt, run, step into or skip an instruction, read/write any contents of the microcontroller, including all registers, internal and external program memories and all SFRs, including user defined peripherals. More details about DCD's on-chip Debugger. Performance Each core has been tested in variety of FPGA and ASIC technologies. Its implementation's results are summarized below.

    DQ80251 core area and performance in ASIC devices - results given for working system with connected CODE and DATA memories. All CPU features and Peripherals have been included. DoCD JTAG debugger increases core size by approximately 2900 gates.



    • 100% binary compatible with industry standard 80C251, implementing BINARY and SOURCE modes
    • Single clock period per most of instructions
    • Quad-Pipelined architecture enables to run 66 times faster than the original 80C51 and 5.5 times faster, than the 80C251 at the same frequency
    • Up to 61.8 VAX MIPS at 100 MHz
    • Up to 8M bytes of Program Memory
    • Up to 32k bytes of internal (on-chip) Data Memory
    • Up to 8M bytes of external (off-chip) Data Memory
    • Up to 16 MB of total memory space for CODE and DATA
    • 32k bytes of extended stack space
    • User programmable Program Memory Wait States solution - for wide range of memories' speed
    • User programmable Extended Data Memory Wait States solution - for wide range of memories' speed
    • De-multiplexed Address/Data bus, to allow easy connection to memory
    • Full Program Memory writes
    • Interface for additional Special Function Registers
    • Fully synthesizable
    • Static synchronous design
    • No internal tri-states
    • Scan test ready


    • VHDL Source Code or/and
    • VERILOG Source Code or/and
    • Encrypted, or plain text EDIF
    • VHDL & VERILOG test bench environment
    • Active-HDL automatic simulation macros
    • ModelSim automatic simulation macros
    • Tests with reference responses
    • Technical documentation
    • Installation notes
    • HDL core specification
    • Datasheet
    • Synthesis scripts
    • Example application
    • Technical support

    Tech Specs


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