Difference between revisions of "CPUProject"

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CPU project is one of the projects designed in department of computer engineering at TTU as a lab project. The main aims of this project are:
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CPU project is one of the projects designed in department of computer engineering at TTU as a lab project to provide students with some tools for studying CPU architecture.
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* Developing a generic CPU without any fancy feature
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* Writing a compiler for it
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* Compiling GCC for this architecture
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* Booting a light linux on it
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= CPU Design=
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== Functionality Requirements ==
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The CPU is supposed to be able to perform the following operations:
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* Addition/Subtraction
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* Increment/Decrement
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* Arithmetic and Logical Shift
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* Bitwise AND, OR, XOR and NOT
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* Negation
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* Load/Store
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* Unconditional Branch (jump)
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* Branch if zero / Branch if Overflow / Branch if Carry
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* Clear Registers/Flags
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* PUSH / POP
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* NOP/HALT
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== Instruction Set Architecture (ISA)==
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= CPU implementations =
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The following instrcutions designed for the CPU:
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Currently, there are two different CPU implementations:
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{| class="wikitable"
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* [[picoCPU]]: a very simple, simulation oriented CPU written in VHDL.
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* A [[More Advanced CPU]]: a synthesizable CPU written in VHDL. It has also some more advanced features compared to the picoCPU, like stack, pipeline, etc.
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! Instruction !! Description !! OpCode !! DPU Command !! Data To DPU !! MemAddress !!  Next PC
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| Add_A_B || A <-- A + B || Example || Example || Example || Example || Example 
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| Add_A_Mem || Example || Example || Example || Example || Example || Example 
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| Add_A_Dir || Example || Example || Example || Example || Example || Example 
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| Sub_A_B || Example || Example || Example || Example || Example || Example 
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| Sub_A_Mem || Example || Example || Example || Example || Example || Example 
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| Sub_A_Dir || Example || Example || Example || Example || Example || Example 
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| IncA || Example || Example || Example || Example || Example || Example 
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| DecA || Example || Example || Example || Example || Example || Example
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| And_A_B || Example || Example || Example || Example || Example || Example 
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| OR_A_B || Example || Example || Example || Example || Example || Example 
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| XOR_A_B || Example || Example || Example || Example || Example || Example 
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| FlipA || Example || Example || Example || Example || Example || Example 
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| NegA || Example || Example || Example || Example || Example || Example 
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| Jmp || Example || Example || Example || Example || Example || Example 
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| JmpZ || Example || Example || Example || Example || Example || Example 
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| JmpOV || Example || Example || Example || Example || Example || Example 
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| Jmp_rel || Example || Example || Example || Example || Example || Example 
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| JMPEQ || Example || Example || Example || Example || Example || Example 
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| ClearZ || Example || Example || Example || Example || Example || Example 
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| ClearOV || Example || Example || Example || Example || Example || Example 
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| LoadPC  || Example || Example || Example || Example || Example || Example 
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| SavePC || Example || Example || Example || Example || Example || Example 
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| ShiftArithR || Example || Example || Example || Example || Example || Example 
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| ShiftArithL || Example || Example || Example || Example || Example || Example 
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| ShiftA_R || Example || Example || Example || Example || Example || Example 
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| ShiftA_L || Example || Example || Example || Example || Example || Example 
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| Load_A_Mem || Example || Example || Example || Example || Example || Example 
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| Store_A_Mem || Example || Example || Example || Example || Example || Example 
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| Load_B_Dir || Example || Example || Example || Example || Example || Example 
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| Load_B_Mem || Example || Example || Example || Example || Example || Example 
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| JmpC || Example || Example || Example || Example || Example || Example 
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| ClearC || Example || Example || Example || Example || Example || Example 
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| ClearACC || Example || Example || Example || Example || Example || Example 
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| RRC || Example || Example || Example || Example || Example || Example 
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| PUSH || Example || Example || Example || Example || Example || Example 
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| POP || Example || Example || Example || Example || Example || Example 
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| RLC || Example || Example || Example || Example || Example || Example 
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| NOP || Example || Example || Example || Example || Example || Example 
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| HALT || Example || Example || Example || Example || Example || Example 
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|}
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===Other instructions implementation===
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the follwoing instructions can be also implemented with the ones in IS:
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* Call "function_name":  
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PUSH
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SavePC
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Push
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Jmp "function address"
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POP 
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* Return:
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POP
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Add_A_Dir 4
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LoadPC
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== Functional Testing ==
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= picoAssembler =
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PicoAssembler is a simple, reconfigurable assembler that can be used together with the processors described above
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= Assembler =
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More info on this can be found on the [[PicoAssembler user manual and syntax reference]] page.
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= Compiler =
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Latest revision as of 15:32, 24 November 2015

CPU project is one of the projects designed in department of computer engineering at TTU as a lab project to provide students with some tools for studying CPU architecture.

CPU implementations

Currently, there are two different CPU implementations:

  • picoCPU: a very simple, simulation oriented CPU written in VHDL.
  • A More Advanced CPU: a synthesizable CPU written in VHDL. It has also some more advanced features compared to the picoCPU, like stack, pipeline, etc.

picoAssembler

PicoAssembler is a simple, reconfigurable assembler that can be used together with the processors described above More info on this can be found on the PicoAssembler user manual and syntax reference page.

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