package hdl.ppa

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Length units here are abbreviated in ASCII-compatible way in the identifier suffixes. `um` - Micrometer (length) `um2` - square Micrometer (area)

Used in: PowerPerformanceAreaProto

• optional float die_area_um2 = 1

  The whole die area.

• optional float cell_area_um2 = 2

  Area only covered by cells.

• optional float die_height_um = 3

  If height and width are provided, this allows to calculate die_area_um2. Protocol buffer writers that know and provide width and height SHOULD also always provide die_area_um2. The following invariants hold: die_area_um2 = die_height_um * die_width_um; cell_area_um2 = die_area_um2 * cell_utilization_fraction

• optional float die_width_um = 4

• optional float cell_utilization_fraction = 5

  A fraction of die_area_um2 used by cells. Range of [0..1]

• optional float area_combinationals_um2 = 6

  Area only covered by combinationals.

• optional float area_buffers_um2 = 7

  Area only covered by buffers.

• optional float area_timing_buffers_um2 = 8

  Area only covered by timing buffers.

• optional float area_sequentials_um2 = 9

  Area only covered by sequentials.

• optional float area_inverters_um2 = 16

  Area only covered by inverters.

• optional float area_macros_um2 = 17

  Area only covered by macros.

• optional int32 num_total_cells = 10

  The total number of standard cells used. Invariance: total_cells = buffers + timing_buffers + sequential + combinational;

• optional int32 num_combinational = 11

  The number of combinational gate cells.

• optional int32 num_buffers = 12

  The number of non-timing buffers.

• optional int32 num_timing_buffers = 13

  The number of timing buffers.

• optional int32 num_sequential = 14

  The number of sequential elements, such as flops.

• optional int32 num_inverters = 15

  The number of inverters.

• optional float num_macros = 18

  The number of macros.

• map<string, float> celltype_fractions = 20

  Cell type mapping to fraction used in the area, e.g. {{ "svt: 0.7 }, { "lvt": 0.3}}

Used in: PowerPerformanceAreaProto

• optional int32 clock_period_ps = 1

  Desired clock period this PPA metric was generated for. It influences the choice of area-impacting optimization, so this helps to understand area size in that context.

• optional int32 critical_path_ps = 2

  Longest path in picoseconds.

• optional float fmax_ghz = 8

  The highest achievable clock frequency (reciprocal of `critical_path_ps`). Unit is gigahertz (1e^9/s).

• optional sint32 setup_wns_ps = 3

  A negative value indicates that the data is not available in time at the endpoint to properly sample the value. A zero value indicates that timing is met - positive values are atypical but can be used to report margin. These values are the worst of in2reg, reg2reg, reg2out, and in2out.

• optional sint64 setup_tns_ps = 4

• optional sint32 hold_wns_ps = 5

  A negative value indicates that new data arrives too early for the endpoint to properly sample the previous value. A zero value indicates that timing is met - positive values are atypical but can be used to report margin. These values are the worst of in2reg, reg2reg, reg2out, and in2out.

• optional sint64 hold_tns_ps = 6

• optional TimingBreakdown in2reg = 20

  Additional timing breakdowns for each timing path category. Paths of primary top-level inputs to their first inner block registers.

• optional TimingBreakdown reg2reg = 21

  Paths of inner block registers to inner block registers.

• optional TimingBreakdown reg2out = 22

  Paths of final inner block registers to block primary top-level outputs.

• optional TimingBreakdown in2out = 23

  Paths of primary top-level inputs to outputs that do not contain registers.

• optional sint32 clock_skew_ps = 7

  How far off the clock is between two different parts of the chip.

• optional int32 num_setup_violations = 10

• optional int32 num_hold_violations = 11

• optional int32 num_slew_violations = 12

• optional int32 num_fanout_violations = 13

• optional int32 num_capacitance_violations = 14

• optional int32 longest_topological_path = 15

  The number of cells in the longest topological path which can be determined before timing analysis has been done.

• optional int32 critical_path_cells = 16

  Number of cells in the critical path based on timing if available.

Used in: PowerPerformanceAreaProto

• optional PowerBreakdown total = 1

  The total power. Typically the sum of all of the below, but could be more if not all summands are mentioned below.

• optional PowerBreakdown sequential = 2

• optional PowerBreakdown combinational = 3

• optional PowerBreakdown macro = 4

  Macro and/or black_box

• optional PowerBreakdown pad = 5

  IO pads

• optional PowerBreakdown clock = 6

  Clock tree

• optional string estimation_method = 7

  Description of the method used to estimate power, e.g. probabilistic switching or a vector power analysis.

Used in: Power

• optional float total_watts = 1

  The total power. Typically the sum of all of the below, but could be more if not all summands are mentioned below.

• optional float internal_watts = 2

• optional float switching_watts = 3

• optional float leakage_watts = 4

A protocol buffer describing performance metrics for a particular design.

• optional Power power = 1

• optional Performance performance = 2

• optional Area area = 3

• optional string cell_library = 4

  Information about the operating corner.

• optional float operating_voltage = 5

• optional string build_info = 10

  Arbitrary string that might be used to describe the job that created this data, e.g. command line options.

Used in: Performance

• optional sint32 setup_wns_ps = 1

  See `setup_wns_ps` and `setup_tns_ps` descriptions for details.

• optional sint64 setup_tns_ps = 2

• optional int32 num_setup_violations = 5

• optional sint32 hold_wns_ps = 3

  See `hold_wns_ps` and `hold_tns_ps` descriptions for details.

• optional sint64 hold_tns_ps = 4

• optional int32 num_hold_violations = 6