RV32I MICROPROCESSOR

DESIGN

Phase 1:

A RV32I RISCV Processor in which all integer type commands and operations can be performed (including jal,jalr,branch commands etc).Both sequential and control flow operations can be executed on this microprocessor. I have used RISCV assembly language instructions to decorde them through opcodes then the respective signals gets onn and all the instructions breakdown into pieces including opcode, immediate ( constant ,if their any ), alu operation ,registers etc.All this is done on logisim software. This microprocessor includes the following blocks:

• immediate generation block
• opcode decoder
• register file
• ALU
• Branch ALU
• ALU controller And many multiplexers and memories from the top file veiw.

Phase 2:

After implementing on a drag and drop software called logisim. It is then coded in a hardware discriptive language called SYSTEMVERILOG.In further upgradation a bus architechture (SOC) called TILELINK is also implemented in this single cycle processor which provides communication between memories and core. For which 2 channel A are used for request signals and 2 channel D are used for response signals from core to memories (host to device) and viseversa. After interconnecting whole processor it is tested on verilator and questa so far.

SIMULATION

To run the Simulation :

1. Clone the repo.
2. Change the inst.mem file path in Simulation/rtl/src/i_mem.sv file.
3. Go to simulation dir :

   cd Simulation
   

To run on Verilator using FuseSoC

4. fusesoc --cores-root=. run --target=sim top --vcd --timeout 100000
   

5. To see static waveform output on gtk-wave : cd build/top_1.0/sim-verilator gtkwave trace.vcd

To run UVM verification using Questa

4. make sim
   

5. For GUI based simulation

   make simgui
   

To run jaspergold

4. jg jaspergold.tcl
   

Sample Tests

There's a folder in Simulation/rtl/tests which contains the assembly tests, convert them into hex using (venus)[https://venus.kvakil.me/] and as above mentioned update the hex file path in inst.mem and run.