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Diffstat (limited to 'src/synth/netlists-gates.ads')
| -rw-r--r-- | src/synth/netlists-gates.ads | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/src/synth/netlists-gates.ads b/src/synth/netlists-gates.ads index 042091e3c..7ea18d4a0 100644 --- a/src/synth/netlists-gates.ads +++ b/src/synth/netlists-gates.ads @@ -119,6 +119,18 @@ package Netlists.Gates is Id_Output : constant Module_Id := 50; Id_Ioutput : constant Module_Id := 51; Id_Port : constant Module_Id := 52; + + -- Id_Inout is a virtual gate used to fit inout direction into the netlist + -- model which has only inputs and outputs. + -- It is virtual because it doesn't perform any computation. + -- Its output 1 must always be connected to an inout port of the module. + -- (more precisely: to an input port marked as inout of the self instance). + -- If input 0 is connected, it is a driver to the inout port. + -- The current value of the inout port can be read from output 0. + -- + -- Inputs: 0: value to be assigned to the port + -- Outputs: 0: value of the port + -- 1: direct and only connection to the port Id_Inout : constant Module_Id := 53; -- Note: initial values must be constant nets. |