| kind = "layout_case" |
| id = "freepdk45.OpenRAM.write_driver" |
| title = "Complementary SRAM Write Driver" |
| status = "qualified" |
| in_core = true |
| core_order = 12 |
|
|
| [[assets]] |
| path = "reference/write_driver.gds" |
| role = "reference" |
| visibility = "maintainer" |
| format = "gds" |
| sha256 = "2465c2b5293b138226ebc396cc13dd19bca4b8aba3268dfead8f83893316ba78" |
|
|
| [task] |
| hours = 1 |
| kind = "netlist_to_gds" |
| family = "freepdk45_write_driver" |
| coefficient = 3 |
| environment = "freepdk45-nominal-predictive-rc" |
|
|
| [task.inputs.description] |
| path = "problem.md" |
| format = "text" |
| sha256 = "fc6a076567e6933008d95db0c645b619055bc386c78f998e072fa56e70ed6d3d" |
|
|
| [task.inputs.netlist] |
| path = "materials/circuit.spice" |
| format = "spice" |
| subcircuit = "write_driver" |
| sha256 = "40cf5d0d27b138b06a7b6b0bbdffefbf6a0569fae6092f1fd6d64c5501a952b4" |
|
|
| [task.inputs.performance] |
| path = "materials/testbench.spice" |
| format = "spice" |
| sha256 = "588e1607eace9ca43fc016350cd2bff550eb90c6aae16a338f47275ba8b2fe4f" |
|
|
| [task.constraints] |
| quality = [ |
| { id = "area", type = "functional_bbox_area", layers_from = "outline" }, |
| ] |
|
|
| [[task.constraints.hard]] |
| id = "outline" |
| type = "bbox_max" |
| functional_layers = [ |
| [ |
| 1, |
| 0, |
| ], |
| [ |
| 2, |
| 0, |
| ], |
| [ |
| 3, |
| 0, |
| ], |
| [ |
| 4, |
| 0, |
| ], |
| [ |
| 5, |
| 0, |
| ], |
| [ |
| 6, |
| 0, |
| ], |
| [ |
| 7, |
| 0, |
| ], |
| [ |
| 8, |
| 0, |
| ], |
| [ |
| 9, |
| 0, |
| ], |
| [ |
| 10, |
| 0, |
| ], |
| [ |
| 11, |
| 0, |
| ], |
| [ |
| 12, |
| 0, |
| ], |
| [ |
| 13, |
| 0, |
| ], |
| [ |
| 14, |
| 0, |
| ], |
| [ |
| 15, |
| 0, |
| ], |
| [ |
| 16, |
| 0, |
| ], |
| [ |
| 17, |
| 0, |
| ], |
| [ |
| 18, |
| 0, |
| ], |
| [ |
| 19, |
| 0, |
| ], |
| [ |
| 20, |
| 0, |
| ], |
| [ |
| 21, |
| 0, |
| ], |
| [ |
| 22, |
| 0, |
| ], |
| [ |
| 23, |
| 0, |
| ], |
| [ |
| 24, |
| 0, |
| ], |
| [ |
| 25, |
| 0, |
| ], |
| [ |
| 26, |
| 0, |
| ], |
| [ |
| 27, |
| 0, |
| ], |
| [ |
| 28, |
| 0, |
| ], |
| [ |
| 29, |
| 0, |
| ], |
| ] |
| max_width_um = 100 |
| max_height_um = 100 |
|
|
| [task.output] |
| path = "output/final.gds" |
| format = "gds" |
| top_cell = "write_driver" |
| max_bytes = 10485760 |
|
|
| [task.evaluation] |
| mode = "post_layout" |
|
|
| [[task.evaluation.jobs]] |
| id = "artifact" |
| stage = "check" |
| operation = "layout.artifact" |
| gate = "artifact" |
|
|
| [task.evaluation.jobs.inputs] |
| layout = "candidate" |
| task = "task" |
|
|
| [[task.evaluation.jobs]] |
| id = "drc" |
| stage = "check" |
| operation = "layout.drc" |
| gate = "drc" |
|
|
| [task.evaluation.jobs.inputs] |
| layout = "candidate" |
| task = "task" |
|
|
| [[task.evaluation.jobs]] |
| id = "lvs" |
| stage = "check" |
| operation = "layout.lvs" |
| gate = "lvs" |
|
|
| [task.evaluation.jobs.inputs] |
| layout = "candidate" |
| task = "task" |
| netlist = "input:netlist" |
|
|
| [task.evaluation.jobs.outputs] |
| database = "klayout-lvs" |
| binding = "json" |
|
|
| [[task.evaluation.jobs]] |
| id = "geometry" |
| stage = "check" |
| operation = "layout.geometry" |
| gate = "constraint" |
| requires = [ |
| "artifact", |
| "drc", |
| "lvs", |
| ] |
|
|
| [task.evaluation.jobs.inputs] |
| layout = "candidate" |
| task = "task" |
| constraints = "input:constraints" |
| database = "job:lvs:database" |
| binding = "job:lvs:binding" |
|
|
| [[task.evaluation.jobs]] |
| id = "parasitics" |
| stage = "extract" |
| operation = "layout.extract_rc" |
| requires = [ |
| "artifact", |
| "drc", |
| "lvs", |
| "geometry", |
| ] |
|
|
| [task.evaluation.jobs.inputs] |
| layout = "candidate" |
| task = "task" |
|
|
| [task.evaluation.jobs.outputs] |
| netlist = "spice" |
|
|
| [task.evaluation.jobs.parameters] |
| ports = [ |
| "din", |
| "bl", |
| "br", |
| "wen", |
| "vdd", |
| "gnd", |
| ] |
|
|
| [[task.evaluation.jobs]] |
| id = "nominal" |
| stage = "simulate" |
| operation = "circuit.simulate" |
|
|
| [task.evaluation.jobs.inputs] |
| deck = "input:performance" |
| dut = "job:parasitics:netlist" |
|
|
| [task.evaluation.jobs.outputs] |
| waveform = "ngspice-raw" |
|
|
| [task.evaluation.jobs.parameters.exports] |
| waveform = "waveform.raw" |
|
|
| [task.evaluation.jobs.parameters.measurements] |
| bl_low = "V" |
| br_high = "V" |
| bl_high = "V" |
| br_low = "V" |
| z_bl = "V" |
| z_br = "V" |
| supply = "W" |
| data_delay_bl = "s" |
| data_delay_br = "s" |
| data_delay_fall_bl = "s" |
| data_delay_fall_br = "s" |
|
|
| [[task.evaluation.metrics]] |
| id = "functional_area" |
| category = "physical" |
| observations = [ |
| "geometry:area", |
| ] |
| unit = "um2" |
| direction = "minimize" |
| aggregation = "max" |
|
|
| [[task.evaluation.metrics]] |
| id = "bl_low" |
| category = "performance" |
| observations = [ |
| "nominal:bl_low", |
| ] |
| unit = "V" |
| direction = "minimize" |
| aggregation = "max" |
|
|
| [task.evaluation.metrics.requirement] |
| upper = 0.1 |
| rationale = "The declared truth-table, SRAM sense or polarity-correct comparator output must reach its stated CMOS logic level at every functional sample under the fixed supply and load." |
|
|
| [[task.evaluation.metrics]] |
| id = "br_high" |
| category = "performance" |
| observations = [ |
| "nominal:br_high", |
| ] |
| unit = "V" |
| direction = "maximize" |
| aggregation = "min" |
|
|
| [task.evaluation.metrics.requirement] |
| lower = 0.9 |
| rationale = "The declared truth-table, SRAM sense or polarity-correct comparator output must reach its stated CMOS logic level at every functional sample under the fixed supply and load." |
|
|
| [[task.evaluation.metrics]] |
| id = "bl_high" |
| category = "performance" |
| observations = [ |
| "nominal:bl_high", |
| ] |
| unit = "V" |
| direction = "maximize" |
| aggregation = "min" |
|
|
| [task.evaluation.metrics.requirement] |
| lower = 0.9 |
| rationale = "The declared truth-table, SRAM sense or polarity-correct comparator output must reach its stated CMOS logic level at every functional sample under the fixed supply and load." |
|
|
| [[task.evaluation.metrics]] |
| id = "br_low" |
| category = "performance" |
| observations = [ |
| "nominal:br_low", |
| ] |
| unit = "V" |
| direction = "minimize" |
| aggregation = "max" |
|
|
| [task.evaluation.metrics.requirement] |
| upper = 0.1 |
| rationale = "The declared truth-table, SRAM sense or polarity-correct comparator output must reach its stated CMOS logic level at every functional sample under the fixed supply and load." |
|
|
| [[task.evaluation.metrics]] |
| id = "z_bl" |
| category = "performance" |
| observations = [ |
| "nominal:z_bl", |
| ] |
| unit = "V" |
| direction = "target" |
| aggregation = "max" |
|
|
| [task.evaluation.metrics.requirement] |
| lower = 0.45 |
| upper = 0.55 |
| rationale = "With the write driver disabled, both outputs must return to the 0.5 V passive load midpoint within 50 mV; this tests the required high-impedance state rather than driven logic." |
|
|
| [[task.evaluation.metrics]] |
| id = "z_br" |
| category = "performance" |
| observations = [ |
| "nominal:z_br", |
| ] |
| unit = "V" |
| direction = "target" |
| aggregation = "max" |
|
|
| [task.evaluation.metrics.requirement] |
| lower = 0.45 |
| upper = 0.55 |
| rationale = "With the write driver disabled, both outputs must return to the 0.5 V passive load midpoint within 50 mV; this tests the required high-impedance state rather than driven logic." |
|
|
| [[task.evaluation.metrics]] |
| id = "supply" |
| category = "performance" |
| observations = [ |
| "nominal:supply", |
| ] |
| unit = "W" |
| direction = "minimize" |
| aggregation = "max" |
| dimension = "supply" |
| baseline = [ |
| "source_nominal:supply", |
| ] |
| normalization = "ratio" |
| scale = 1e-12 |
|
|
| [task.evaluation.metrics.requirement] |
| lower = 0 |
| rationale = "The declared powered circuit must consume nonnegative net energy from its supplies and driven references over the stated observation; power magnitude remains a quality objective." |
|
|
| [[task.evaluation.metrics]] |
| id = "data_delay" |
| category = "performance" |
| observations = [ |
| "nominal:data_delay_bl", |
| "nominal:data_delay_br", |
| "nominal:data_delay_fall_bl", |
| "nominal:data_delay_fall_br", |
| ] |
| baseline = [ |
| "source_nominal:data_delay_bl", |
| "source_nominal:data_delay_br", |
| "source_nominal:data_delay_fall_bl", |
| "source_nominal:data_delay_fall_br", |
| ] |
| unit = "s" |
| direction = "minimize" |
| aggregation = "max" |
| dimension = "response" |
| normalization = "ratio" |
|
|
| [task.evaluation.metrics.requirement] |
| lower = 0.0 |
| rationale = "The declared ordered-event interval or crossing frequency has a nonnegative measurement domain, and its crossing must exist for a usable observation." |
|
|
| [task.evaluation.metrics.quality_target] |
| value = 7e-11 |
| rationale = "Complete every enabled data-to-bitline transition within 70 ps under the declared 10 fF and 100 kohm loads." |
|
|
| [task.evaluation.scoring] |
| method = "layout" |
| area_metric = "functional_area" |
| area_target = 1.8 |
| rationale = "The 1.8 um2 area goal rewards sharing in the two complementary tristate branches, without changing their 12 transistors. Delay receives 50% because four loaded transitions expose routing imbalance; area receives 40% and supply power 10%. The 70 ps timing goal is close to the slowest source transition (about 68 ps); disabled high-impedance behavior remains a functional check." |
|
|
| [task.evaluation.scoring.weights] |
| functional_area = 0.4 |
| data_delay = 0.5 |
| supply = 0.1 |
|
|
| [task.evaluation.pre_layout] |
| source_report_sha256 = "1c1c0efa051f6fe904269e5969a27eaf6224b66d0296b114ac96319c759f5aee" |
|
|
| [task.evaluation.pre_layout.backends] |
| "circuit.simulate" = "{\"adapter\": \"ngspice-docker\", \"adapter_sha256\": \"dfbdf2f93297bbe7d8b576fb988504bd0ecf85b93ef47c314a0f2c9c8830c3e7\", \"compatibility\": null, \"cpu_budget\": 8, \"execution_sha256\": \"495aa9623759f70228a236eb4825c2ae443ef6a741816d8cfc17d1830841dcef\", \"image_id\": \"sha256:060fee64f9f6e71a647e5e958b788d723c9d51d2928ff93e6a295db1959bc37f\", \"limits\": {\"cpus\": 8, \"memory_mb\": 4096, \"pids\": 256}, \"max_parallel_jobs\": 8, \"resistor_formulation\": \"conductance\", \"support_sha256\": \"660672961e1ce0632bb9e18bc6dfb1fbd751a36d1fc496f1491763859d76c624\", \"thread_environment\": {\"OMP_NUM_THREADS\": \"1\", \"OMP_THREAD_LIMIT\": \"1\"}, \"threads\": 1, \"timeout_seconds\": 120.0, \"tool_version\": \"******\\n** ngspice-45 : Circuit level simulation program\\n** Compiled with KLU Direct Linear Solver\\n** The U. C. Berkeley CAD Group\\n** Copyright 1985-1994, Regents of the University of California.\\n** Copyright 2001-2025, The ngspice team.\\n** Please get your ngspice manual from https://ngspice.sourceforge.io/docs.html\\n** Please file your bug-reports at http://ngspice.sourceforge.net/bugrep.html\\n** Creation Date: Thu Sep 17 13:42:47 UTC 2026\\n******\"}" |
|
|
| [task.evaluation.pre_layout.jobs.source_nominal] |
| operation = "circuit.simulate" |
|
|
| [task.evaluation.pre_layout.jobs.source_nominal.inputs] |
| deck = "input:performance" |
| dut = "input:netlist" |
|
|
| [task.evaluation.pre_layout.jobs.source_nominal.outputs] |
| waveform = "ngspice-raw" |
|
|
| [task.evaluation.pre_layout.jobs.source_nominal.parameters.exports] |
| waveform = "waveform.raw" |
|
|
| [task.evaluation.pre_layout.jobs.source_nominal.parameters.measurements] |
| bl_high = "V" |
| bl_low = "V" |
| br_high = "V" |
| br_low = "V" |
| data_delay_bl = "s" |
| data_delay_br = "s" |
| data_delay_fall_bl = "s" |
| data_delay_fall_br = "s" |
| supply = "W" |
| z_bl = "V" |
| z_br = "V" |
|
|
| [task.evaluation.pre_layout.jobs.source_nominal.input_sha256] |
| deck = "588e1607eace9ca43fc016350cd2bff550eb90c6aae16a338f47275ba8b2fe4f" |
| dut = "40cf5d0d27b138b06a7b6b0bbdffefbf6a0569fae6092f1fd6d64c5501a952b4" |
|
|
| [task.evaluation.pre_layout.jobs.source_nominal.measurements.bl_high] |
| value = 0.9860666 |
| unit = "V" |
|
|
| [task.evaluation.pre_layout.jobs.source_nominal.measurements.bl_low] |
| value = 0.0150365 |
| unit = "V" |
|
|
| [task.evaluation.pre_layout.jobs.source_nominal.measurements.br_high] |
| value = 0.9886259 |
| unit = "V" |
|
|
| [task.evaluation.pre_layout.jobs.source_nominal.measurements.br_low] |
| value = 0.02670905 |
| unit = "V" |
|
|
| [task.evaluation.pre_layout.jobs.source_nominal.measurements.data_delay_bl] |
| value = 5.409058e-11 |
| unit = "s" |
|
|
| [task.evaluation.pre_layout.jobs.source_nominal.measurements.data_delay_br] |
| value = 6.295051e-11 |
| unit = "s" |
|
|
| [task.evaluation.pre_layout.jobs.source_nominal.measurements.data_delay_fall_bl] |
| value = 6.78363e-11 |
| unit = "s" |
|
|
| [task.evaluation.pre_layout.jobs.source_nominal.measurements.data_delay_fall_br] |
| value = 4.749879e-11 |
| unit = "s" |
|
|
| [task.evaluation.pre_layout.jobs.source_nominal.measurements.supply] |
| value = 2.174283e-05 |
| unit = "W" |
|
|
| [task.evaluation.pre_layout.jobs.source_nominal.measurements.z_bl] |
| value = 0.5015592 |
| unit = "V" |
|
|
| [task.evaluation.pre_layout.jobs.source_nominal.measurements.z_br] |
| value = 0.502349 |
| unit = "V" |
|
|
| [task.evaluation.pre_layout.jobs.source_nominal.output_sha256] |
| waveform = "319ae9bc6fda9bb4d5e68f3d3f1435e9288ed2a7ff7dec670e469cf3cd08c480" |
|
|
| [toolchain.backends.artifact] |
| type = "klayout-docker" |
|
|
| [toolchain.backends.artifact.settings] |
| image = "iclayout-eda-open:local" |
| check = "artifact" |
| timeout_seconds = 120 |
|
|
| [toolchain.backends.drc] |
| type = "klayout-docker" |
|
|
| [toolchain.backends.drc.settings] |
| image = "iclayout-eda-open:local" |
| check = "drc" |
| timeout_seconds = 120 |
| support = "build/support/freepdk45-klayout" |
| profile = "drc.json" |
|
|
| [toolchain.backends.drc.support_profiles] |
| support = "klayout" |
|
|
| [toolchain.backends.lvs] |
| type = "klayout-docker" |
|
|
| [toolchain.backends.lvs.settings] |
| image = "iclayout-eda-open:local" |
| check = "lvs" |
| timeout_seconds = 120 |
| support = "build/support/freepdk45-klayout" |
| profile = "strict-lvs.json" |
|
|
| [toolchain.backends.lvs.support_profiles] |
| support = "klayout" |
|
|
| [toolchain.backends.geometry] |
| type = "klayout-geometry-docker" |
|
|
| [toolchain.backends.geometry.settings] |
| image = "iclayout-eda-open:local" |
| timeout_seconds = 60 |
|
|
| [toolchain.backends.rc] |
| type = "magic-rc-docker" |
|
|
| [toolchain.backends.rc.settings] |
| image = "iclayout-eda-open:local" |
| support = "build/support/freepdk45-magic-vtg" |
| technology = "freepdk45.tech" |
| tech_name = "freepdk45" |
| style = "spice3(sim)" |
| gds_readonly = false |
| case_insensitive_ports = true |
| label_layers = [ |
| [ |
| 9, |
| 0, |
| ], |
| [ |
| 11, |
| 0, |
| ], |
| [ |
| 13, |
| 0, |
| ], |
| [ |
| 15, |
| 0, |
| ], |
| [ |
| 17, |
| 0, |
| ], |
| [ |
| 19, |
| 0, |
| ], |
| [ |
| 21, |
| 0, |
| ], |
| [ |
| 23, |
| 0, |
| ], |
| [ |
| 25, |
| 0, |
| ], |
| [ |
| 27, |
| 0, |
| ], |
| [ |
| 29, |
| 0, |
| ], |
| ] |
| timeout_seconds = 120 |
|
|
| [toolchain.backends.rc.support_profiles] |
| support = "magic-vtg" |
|
|
| [toolchain.backends.ngspice] |
| type = "ngspice-docker" |
|
|
| [toolchain.backends.ngspice.settings] |
| max_parallel_jobs = 8 |
| threads = 1 |
| cpu_budget = 8 |
| image = "iclayout-eda-open:local" |
| support = "build/support/freepdk45-models" |
| timeout_seconds = 120 |
|
|
| [toolchain.backends.ngspice.support_profiles] |
| support = "models" |
|
|
| [toolchain.bindings] |
| "layout.artifact" = "artifact" |
| "layout.drc" = "drc" |
| "layout.lvs" = "lvs" |
| "layout.geometry" = "geometry" |
| "layout.extract_rc" = "rc" |
| "circuit.simulate" = "ngspice" |
|
|
| [qualification] |
| reference = "reference/write_driver.gds" |
|
|
| [origin] |
| url = "https://github.com/ferdous313/OpenRAM/blob/420a33e731d7d80bf9c7cd54ffbeec3603259847/technology/freepdk45/sp_lib/write_driver.sp" |
|
|
| [presentation] |
| category = "Logic & memory" |
| summary = "Drives complementary bitlines during a write and releases them when disabled." |
|
|
