From 9d0bca97755c928b803ebfa0d70ec21c4977e631 Mon Sep 17 00:00:00 2001
From: YRabbit <rabbit@yrabbit.cyou>
Date: Sat, 6 Jul 2024 18:58:21 +1000
Subject: [PATCH] Gowin. Add an energy saving primitive
We add a BANDGAP primitive used to turn off power to OSC, PLL and other
things on some GOWIN chips.
We also mark this primitive and GSR as keep.
Signed-off-by: YRabbit <rabbit@yrabbit.cyou>
---
techlibs/gowin/cells_sim.v | 6 +++++-
techlibs/gowin/cells_xtra.py | 2 +-
techlibs/gowin/cells_xtra.v | 4 ----
3 files changed, 6 insertions(+), 6 deletions(-)
diff --git a/techlibs/gowin/cells_sim.v b/techlibs/gowin/cells_sim.v
index b26869080..4c017e2ab 100644
--- a/techlibs/gowin/cells_sim.v
+++ b/techlibs/gowin/cells_sim.v
@@ -867,8 +867,12 @@ module ODDRC(D0, D1, CLEAR, TX, CLK, Q0, Q1);
parameter INIT = 0;
endmodule
+(* blackbox, keep *)
module GSR (input GSRI);
- wire GSRO = GSRI;
+endmodule
+
+(* blackbox, keep *)
+module BANDGAP (input BGEN);
endmodule
(* abc9_box, lib_whitebox *)
diff --git a/techlibs/gowin/cells_xtra.py b/techlibs/gowin/cells_xtra.py
index 4d117e428..224ece02f 100644
--- a/techlibs/gowin/cells_xtra.py
+++ b/techlibs/gowin/cells_xtra.py
@@ -13,7 +13,7 @@ class State(Enum):
IN_MODULE = auto()
IN_PARAMETER = auto()
-_skip = { 'ALU', 'DFF', 'DFFC', 'DFFCE', 'DFFE', 'DFFN', 'DFFNC', 'DFFNCE',
+_skip = { 'ALU', 'BANDGAP', 'DFF', 'DFFC', 'DFFCE', 'DFFE', 'DFFN', 'DFFNC', 'DFFNCE',
'DFFNE', 'DFFNP', 'DFFNPE', 'DFFNR', 'DFFNRE', 'DFFNS', 'DFFNSE',
'DFFP', 'DFFPE', 'DFFR', 'DFFRE', 'DFFS', 'DFFSE', 'DP', 'DPX9',
'ELVDS_OBUF', 'GND', 'GSR', 'IBUF', 'IDDR', 'IDDRC', 'IDES10',
diff --git a/techlibs/gowin/cells_xtra.v b/techlibs/gowin/cells_xtra.v
index 4b89b8098..639014dc1 100644
--- a/techlibs/gowin/cells_xtra.v
+++ b/techlibs/gowin/cells_xtra.v
@@ -1687,10 +1687,6 @@ endmodule
module ADC (...);
endmodule
-module BANDGAP (...);
-input BGEN;
-endmodule
-
module CLKDIV2 (...);
parameter GSREN = "false";
input HCLKIN, RESETN;