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ReVAMP : ReRAM based VLIW architecture for in-memory computing

The arche framework supports behavioural simulation of the ReVAMP architecture[PDF].
For each simulation, a configuration file in json format has to be specified. We explain the configuration file with an example.

{
    "dim": {
        "m": 3,
        "n": 2
    },
    "filename": {
        "varin": "2_bit_xor.varin",
        "input": "2_bit_xor.inp",
        "ins_mem": "2_bit_xor.ins",
        "output": "2_bit_xor",
        "varout": "2_bit_xor.varout"
    },
    "simulation": {
        "gen_pwl": 1,
        "cycles": 0,
        "print_ins": 1,
        "verbose": 0
    },
    "voltage": {
        "0": -2.4,
        "1": 2.4,
        "delta": 5,
        "period": 50
    }
}

The individual fields are described below.

  • dim specifies DCM with m wordlines and n bitlines
  • filename specifies various files used for simulation
    • varin specfies the file with input specified as variables
    • input specifies the PIR contents
    • ins_mem defines the contents of the instruction memory
    • output specifies the prefix of the generated files
    • varout specifies the details of the output generated
  • simulation specifies the simulation parameters
    • cycles define the number of cycles for which simulation has to be performed. 0 indicates all instructions have to simulated.
    • gen_pwl specifies if pwl files for Cadence Simulation have to be generated. The voltage details must be specified, if this field has value 1.
  • voltage specifies the parameters used in the pwl files that can be imported directly in Cadence for simulating the crossbar.
    • 0 and 1 defines the voltage levels.
    • delta specifies the time in ns to switch between voltage levels
    • period specifies the clock time period in ns

To start the tool,

$python3 arche.py 
Synthesis and technology mapping for emerging technologies
arche>

To execute the simulation,

arche>revamp -f tests/share_2inp/config_data.json 
Simulation started for: 0  cycles
Loading to PIR ['0', '1']
In reg: ['0', '1']
device: 1 wl: 1 bl 1
device: 0 wl: 1 bl 0
Cycle 1 : Apply 0 0 01 00 1 0 1 1
Crossbar state:
00
00
01
In reg: ['0', '1']
device: 1 wl: 1 bl 1
device: 0 wl: 1 bl 0
Cycle 2 : Apply 1 0 01 00 1 0 1 1
Crossbar state:
00
01
01
Loading to PIR ['1', '1']
In reg: ['1', '1']
device: 1 wl: 1 bl 1
device: 0 wl: 1 bl 1
Cycle 3 : Apply 2 0 01 00 1 0 1 1
Crossbar state:
00
01
01
DMR: [0, 0]
Cycle 4 : Read 2
Crossbar state:
00
01
01
In reg: [0, 0]
device: 1 wl: 0 bl 0
device: 0 wl: 0 bl 0
Cycle 5 : Apply 0 1 00 00 1 0 1 1
Crossbar state:
00
01
01
In reg: [0, 0]
device: 1 wl: 1 bl 0
device: 0 wl: 1 bl 0
Cycle 6 : Apply 1 1 01 00 1 0 1 1
Crossbar state:
00
11
01
DMR: [1, 1]
Cycle 7 : Read 1
Crossbar state:
00
11
01
In reg: [1, 1]
device: 1 wl: 1 bl 1
device: 0 wl: 1 bl 1
Cycle 8 : Apply 0 1 01 00 1 0 1 1
Crossbar state:
00
11
01

To quit the tool,

arche>quit