gowin: Remove unnecessary attributes

Signed-off-by: YRabbit <rabbit@yrabbit.cyou>

diff --git a/techlibs/gowin/cells_sim.v b/techlibs/gowin/cells_sim.v
index 3f5340b11bc3ff733bbd8b85f06cdebf24aafa9a..b07ee6924eb2ab614b774991ccc9e102c6b064b8 100644 (file)
--- a/techlibs/gowin/cells_sim.v
+++ b/techlibs/gowin/cells_sim.v
@@ -550,7 +550,6 @@ module GND(output G);
        assign G = 0;
 endmodule
 
-(* abc9_box *)
 module IBUF(output O, input I);
 
        specify
@@ -560,7 +559,6 @@ module IBUF(output O, input I);
        assign O = I;
 endmodule
 
-(* abc9_box *)
 module OBUF(output O, input I);
 
        specify
@@ -570,14 +568,12 @@ module OBUF(output O, input I);
        assign O = I;
 endmodule
 
-(* abc9_box *)
 module TBUF (O, I, OEN);
   input I, OEN;
   output O;
   assign O = OEN ? 1'bz : I;
 endmodule
 
-(* abc9_box *)
 module IOBUF (O, IO, I, OEN);
   input I,OEN;
   output O;
@@ -586,7 +582,6 @@ module IOBUF (O, IO, I, OEN);
   assign I = IO;
 endmodule
 
-(* abc9_box *)
 module TLVDS_OBUF (I, O, OB);
   input I;
   output O;