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| author | Tristan Gingold <tgingold@free.fr> | 2022-07-12 08:03:53 +0200 |
|---|---|---|
| committer | Tristan Gingold <tgingold@free.fr> | 2022-07-12 21:00:03 +0200 |
| commit | 9e6785615586ef208c5643e4bd8880aacf98fe99 (patch) | |
| tree | b5199e93c2317edf4fd8cf4f6423defab5648339 /src/synth | |
| parent | 1541c5d742f5860dfff92c12de11415b94ee0709 (diff) | |
| download | ghdl-9e6785615586ef208c5643e4bd8880aacf98fe99.tar.gz ghdl-9e6785615586ef208c5643e4bd8880aacf98fe99.tar.bz2 ghdl-9e6785615586ef208c5643e4bd8880aacf98fe99.zip | |
netlists: add d-latch
Diffstat (limited to 'src/synth')
| -rw-r--r-- | src/synth/netlists-builders.adb | 30 | ||||
| -rw-r--r-- | src/synth/netlists-builders.ads | 3 | ||||
| -rw-r--r-- | src/synth/netlists-gates.ads | 7 |
3 files changed, 38 insertions, 2 deletions
diff --git a/src/synth/netlists-builders.adb b/src/synth/netlists-builders.adb index d0d4b20be..d3eaf6a0a 100644 --- a/src/synth/netlists-builders.adb +++ b/src/synth/netlists-builders.adb @@ -566,6 +566,20 @@ package body Netlists.Builders is Outputs); end Create_Dff_Modules; + procedure Create_Latch_Modules (Ctxt : Context_Acc) + is + Outputs : Port_Desc_Array (0 .. 0); + begin + Ctxt.M_Dlatch := New_User_Module + (Ctxt.Design, + New_Sname_Artificial (Get_Identifier ("dlatch"), No_Sname), + Id_Dlatch, 2, 1, 0); + Outputs := (0 => Create_Output ("q")); + Set_Ports_Desc (Ctxt.M_Dlatch, (0 => Create_Input ("d"), + 1 => Create_Input ("en", 1)), + Outputs); + end Create_Latch_Modules; + procedure Create_Assert_Assume_Cover (Ctxt : Context_Acc) is Outputs : Port_Desc_Array (1 .. 0); @@ -758,6 +772,7 @@ package body Netlists.Builders is Create_Mux_Modules (Res); Create_Objects_Module (Res); Create_Dff_Modules (Res); + Create_Latch_Modules (Res); Create_Assert_Assume_Cover (Res); @@ -1589,6 +1604,21 @@ package body Netlists.Builders is return O; end Build_Midff; + function Build_Dlatch (Ctxt : Context_Acc; En : Net; D : Net) return Net + is + Wd : constant Width := Get_Width (D); + pragma Assert (Get_Width (En) = 1); + Inst : Instance; + O : Net; + begin + Inst := New_Internal_Instance (Ctxt, Ctxt.M_Dlatch); + O := Get_Output (Inst, 0); + Set_Width (O, Wd); + Connect (Get_Input (Inst, 0), D); + Connect (Get_Input (Inst, 1), En); + return O; + end Build_Dlatch; + function Build_Tri (Ctxt : Context_Acc; En : Net; D : Net) return Net is Wd : constant Width := Get_Width (D); diff --git a/src/synth/netlists-builders.ads b/src/synth/netlists-builders.ads index 6111d045f..135b4544f 100644 --- a/src/synth/netlists-builders.ads +++ b/src/synth/netlists-builders.ads @@ -212,6 +212,8 @@ package Netlists.Builders is Els : Net; Init : Net) return Net; + function Build_Dlatch (Ctxt : Context_Acc; En : Net; D : Net) return Net; + function Build_Tri (Ctxt : Context_Acc; En : Net; D : Net) return Net; function Build_Resolver (Ctxt : Context_Acc; L, R : Net) return Net; @@ -257,6 +259,7 @@ private M_Iadff : Module; M_Mdff : Module; M_Midff : Module; + M_Dlatch : Module; M_Tri : Module; M_Resolver : Module; M_Truncate : Module_Arr (Truncate_Module_Id); diff --git a/src/synth/netlists-gates.ads b/src/synth/netlists-gates.ads index 305bd5158..5f09ccafa 100644 --- a/src/synth/netlists-gates.ads +++ b/src/synth/netlists-gates.ads @@ -201,8 +201,11 @@ package Netlists.Gates is -- Output: 0: Q Id_Midff : constant Module_Id := 69; - -- Reserved. - Id_Latch : constant Module_Id := 70; + -- Gated D Latch + -- Inputs: 0: D + -- 1: EN + -- Outputs: 0: Q + Id_Dlatch : constant Module_Id := 70; -- Tri state buffer. -- Inputs: 0: D |