diff --git a/frontends/verific/verific.cc b/frontends/verific/verific.cc
index 08b8c505d..30d701aae 100644
--- a/frontends/verific/verific.cc
+++ b/frontends/verific/verific.cc
@@ -433,7 +433,7 @@ void VerificImporter::import_attributes(dict<RTLIL::IdString, RTLIL::Const> &att
 		auto type_range = nl->GetTypeRange(obj->Name());
 		if (!type_range)
 			return;
-		if (type_range->IsTypeScalar()) {
+		if (nl->IsFromVhdl() && type_range->IsTypeScalar()) {
 			const long long bottom_bound = type_range->GetScalarRangeLeftBound();
 			const long long top_bound = type_range->GetScalarRangeRightBound();
 			const unsigned bit_width = type_range->NumElements();
diff --git a/tests/verific/bounds.sv b/tests/verific/bounds.sv
new file mode 100644
index 000000000..d8081f3b7
--- /dev/null
+++ b/tests/verific/bounds.sv
@@ -0,0 +1,14 @@
+module test (
+    input ia,
+    output oa,
+    input [0:0] ib,
+    output [0:0] ob,
+    input [3:0] ic,
+    output [3:0] oc
+    );
+
+assign oa = ia;
+assign ob = ib;
+assign oc = ic;
+
+endmodule
diff --git a/tests/verific/bounds.vhd b/tests/verific/bounds.vhd
index 14c6c34a7..084aeb4bb 100644
--- a/tests/verific/bounds.vhd
+++ b/tests/verific/bounds.vhd
@@ -2,17 +2,105 @@ library IEEE;
 use IEEE.STD_LOGIC_1164.ALL;
 use IEEE.NUMERIC_STD.ALL;
 
-entity work is
+entity test is
     Port (
-        a : in INTEGER range -5 to 10;
-        b : out INTEGER range -6 to 11
-    );
-end entity work;
+        -- BIT type
+        bit_in : in BIT;
+        bit_out : out BIT;
 
-architecture Behavioral of work is
+        -- BIT_VECTOR type
+        bit_vector_in : in BIT_VECTOR(3 downto 0);
+        bit_vector_out : out BIT_VECTOR(3 downto 0);
+
+        -- BIT_VECTOR type with to index
+        bit_vector_in_to : in BIT_VECTOR(0 to 3);
+        bit_vector_out_to : out BIT_VECTOR(0 to 3);
+
+        -- STD_ULOGIC type
+        std_ulogic_in : in STD_ULOGIC;
+        std_ulogic_out : out STD_ULOGIC;
+
+        -- STD_ULOGIC_VECTOR type
+        std_ulogic_vector_in : in STD_ULOGIC_VECTOR(3 downto 0);
+        std_ulogic_vector_out : out STD_ULOGIC_VECTOR(3 downto 0);
+
+        -- STD_ULOGIC_VECTOR type with to index
+        std_ulogic_vector_in_to : in STD_ULOGIC_VECTOR(0 to 3);
+        std_ulogic_vector_out_to : out STD_ULOGIC_VECTOR(0 to 3);
+
+        -- STD_LOGIC type
+        std_logic_in : in STD_LOGIC;
+        std_logic_out : out STD_LOGIC;
+
+        -- STD_LOGIC_VECTOR type
+        std_logic_vector_in : in STD_LOGIC_VECTOR(3 downto 0);
+        std_logic_vector_out : out STD_LOGIC_VECTOR(3 downto 0);
+
+        -- STD_LOGIC_VECTOR type with to index
+        std_logic_vector_in_to : in STD_LOGIC_VECTOR(0 to 3);
+        std_logic_vector_out_to : out STD_LOGIC_VECTOR(0 to 3);
+
+        -- SIGNED type
+        signed_in : in SIGNED(3 downto 0);
+        signed_out : out SIGNED(3 downto 0);
+
+        -- SIGNED type with to index
+        signed_in_to : in SIGNED(0 to 3);
+        signed_out_to : out SIGNED(0 to 3);
+
+        -- UNSIGNED type
+        unsigned_in : in UNSIGNED(3 downto 0);
+        unsigned_out : out UNSIGNED(3 downto 0);
+
+        -- UNSIGNED type with to index
+        unsigned_in_to : in UNSIGNED(0 to 3);
+        unsigned_out_to : out UNSIGNED(0 to 3);
+
+        -- INTEGER type without range
+        integer_in : in INTEGER;
+        integer_out : out INTEGER;
+
+        -- INTEGER type with range
+        integer_with_range_in : in INTEGER range -5 to 10;
+        integer_with_range_out : out INTEGER range -6 to 10;
+
+        -- INTEGER type with single value range
+        integer_single_value_in : in INTEGER range 5 to 5;
+        integer_single_value_out : out INTEGER range 5 to 5;
+
+        -- INTEGER type with null range
+        integer_null_range_in : in INTEGER range 7 to -1;
+        integer_null_range_out : out INTEGER range 0 to -1;
+
+        -- NATURAL type
+        natural_in : in NATURAL;
+        natural_out : out NATURAL;
+ 
+        -- POSITIVE type
+        positive_in : in POSITIVE;
+        positive_out : out POSITIVE
+    );
+end entity test;
+
+architecture Behavioral of test is
 begin
-    process(a)
-    begin
-        b <= a;
-    end process;
+    bit_out <= bit_in;
+    bit_vector_out <= bit_vector_in;
+    bit_vector_out_to <= bit_vector_in_to;
+    std_ulogic_out <= std_ulogic_in;
+    std_ulogic_vector_out <= std_ulogic_vector_in;
+    std_ulogic_vector_out_to <= std_ulogic_vector_in_to;
+    std_logic_out <= std_logic_in;
+    std_logic_vector_out <= std_logic_vector_in;
+    std_logic_vector_out_to <= std_logic_vector_in_to;
+    signed_out <= signed_in;
+    signed_out_to <= signed_in_to;
+    unsigned_out <= unsigned_in;
+    unsigned_out_to <= unsigned_in_to;
+    integer_with_range_out <= integer_with_range_in;
+    integer_out <= integer_in;
+    integer_single_value_out <= integer_single_value_in;
+    integer_null_range_out <= integer_null_range_in;
+    natural_out <= natural_in;
+    positive_out <= positive_in;
 end architecture Behavioral;
diff --git a/tests/verific/bounds.ys b/tests/verific/bounds.ys
index 425af717c..412a6218a 100644
--- a/tests/verific/bounds.ys
+++ b/tests/verific/bounds.ys
@@ -1,6 +1,147 @@
 read -vhdl bounds.vhd
-verific -import work
-select -assert-count 1 a:bottom_bound=5'bs11011
-select -assert-count 1 a:top_bound=5'bs01010
-select -assert-count 1 a:bottom_bound=5'bs11010
-select -assert-count 1 a:top_bound=5'bs01011
\ No newline at end of file
+hierarchy -top test
+
+# bit: not a scalar type
+select -assert-count 0 w:bit_in a:bottom_bound %i
+select -assert-count 0 w:bit_in a:top_bound %i
+select -assert-count 0 w:bit_out a:bottom_bound %i
+select -assert-count 0 w:bit_out a:top_bound %i
+
+# bit_vector: not a scalar type
+select -assert-count 0 w:bit_vector_in a:bottom_bound %i
+select -assert-count 0 w:bit_vector_in a:top_bound %i
+select -assert-count 0 w:bit_vector_out a:bottom_bound %i
+select -assert-count 0 w:bit_vector_out a:top_bound %i
+
+# bit_vector with to index: not a scalar type
+select -assert-count 0 w:bit_vector_in_to a:bottom_bound %i
+select -assert-count 0 w:bit_vector_in_to a:top_bound %i
+select -assert-count 0 w:bit_vector_out_to a:bottom_bound %i
+select -assert-count 0 w:bit_vector_out_to a:top_bound %i
+
+# std_ulogic: not a scalar type
+select -assert-count 0 w:std_ulogic_in a:bottom_bound %i
+select -assert-count 0 w:std_ulogic_in a:top_bound %i
+select -assert-count 0 w:std_ulogic_out a:bottom_bound %i
+select -assert-count 0 w:std_ulogic_out a:top_bound %i
+
+# std_ulogic_vector: not a scalar type
+select -assert-count 0 w:std_ulogic_vector_in a:bottom_bound %i
+select -assert-count 0 w:std_ulogic_vector_in a:top_bound %i
+select -assert-count 0 w:std_ulogic_vector_out a:bottom_bound %i
+select -assert-count 0 w:std_ulogic_vector_out a:top_bound %i
+
+# std_ulogic_vector with to index: not a scalar type
+select -assert-count 0 w:std_ulogic_vector_in_to a:bottom_bound %i
+select -assert-count 0 w:std_ulogic_vector_in_to a:top_bound %i
+select -assert-count 0 w:std_ulogic_vector_out_to a:bottom_bound %i
+select -assert-count 0 w:std_ulogic_vector_out_to a:top_bound %i
+
+# std_logic: not a scalar type
+select -assert-count 0 w:std_logic_in a:bottom_bound %i
+select -assert-count 0 w:std_logic_in a:top_bound %i
+select -assert-count 0 w:std_logic_out a:bottom_bound %i
+select -assert-count 0 w:std_logic_out a:top_bound %i
+
+# std_logic_vector: not a scalar type
+select -assert-count 0 w:std_logic_vector_in a:bottom_bound %i
+select -assert-count 0 w:std_logic_vector_in a:top_bound %i
+select -assert-count 0 w:std_logic_vector_out a:bottom_bound %i
+select -assert-count 0 w:std_logic_vector_out a:top_bound %i
+
+# std_logic_vector with to index: not a scalar type
+select -assert-count 0 w:std_logic_vector_in_to a:bottom_bound %i
+select -assert-count 0 w:std_logic_vector_in_to a:top_bound %i
+select -assert-count 0 w:std_logic_vector_out_to a:bottom_bound %i
+select -assert-count 0 w:std_logic_vector_out_to a:top_bound %i
+
+# signed: not a scalar type
+select -assert-count 0 w:signed_in a:bottom_bound %i
+select -assert-count 0 w:signed_in a:top_bound %i
+select -assert-count 0 w:signed_out a:bottom_bound %i
+select -assert-count 0 w:signed_out a:top_bound %i
+
+# signed with to index: not a scalar type
+select -assert-count 0 w:signed_in_to a:bottom_bound %i
+select -assert-count 0 w:signed_in_to a:top_bound %i
+select -assert-count 0 w:signed_out_to a:bottom_bound %i
+select -assert-count 0 w:signed_out_to a:top_bound %i
+
+# unsigned: not a scalar type
+select -assert-count 0 w:unsigned_in a:bottom_bound %i
+select -assert-count 0 w:unsigned_in a:top_bound %i
+select -assert-count 0 w:unsigned_out a:bottom_bound %i
+select -assert-count 0 w:unsigned_out a:top_bound %i
+
+# unsigned with to index: not a scalar type
+select -assert-count 0 w:unsigned_in_to a:bottom_bound %i
+select -assert-count 0 w:unsigned_in_to a:top_bound %i
+select -assert-count 0 w:unsigned_out_to a:bottom_bound %i
+select -assert-count 0 w:unsigned_out_to a:top_bound %i
+
+# integer: scalar type
+select -assert-count 1 w:integer_in a:bottom_bound=32'b10000000000000000000000000000000 %i
+select -assert-count 1 w:integer_in a:top_bound=32'b01111111111111111111111111111111 %i
+select -assert-count 1 w:integer_out a:bottom_bound=32'b10000000000000000000000000000000 %i
+select -assert-count 1 w:integer_out a:top_bound=32'b01111111111111111111111111111111 %i
+
+# integer with range: scalar type
+select -assert-count 1 w:integer_with_range_in a:bottom_bound=5'bs11011 %i
+select -assert-count 1 w:integer_with_range_in a:top_bound=5'bs01010 %i
+select -assert-count 1 w:integer_with_range_out a:bottom_bound=5'bs11010 %i
+select -assert-count 1 w:integer_with_range_out a:top_bound=5'bs01010 %i
+
+# integer with single value range: scalar type
+select -assert-count 1 w:integer_single_value_in a:bottom_bound=3'bs101 %i
+select -assert-count 1 w:integer_single_value_in a:top_bound=3'bs101 %i
+select -assert-count 1 w:integer_single_value_out a:bottom_bound=3'bs101 %i
+select -assert-count 1 w:integer_single_value_out a:top_bound=3'bs101 %i
+
+# integer with null range: scalar type
+# select -assert-count 1 w:integer_null_range_in a:bottom_bound=4'bs0111 %i
+# select -assert-count 1 w:integer_null_range_in a:top_bound=4'bs1111 %i
+select -assert-count 1 w:integer_null_range_out a:bottom_bound=2'bs00 %i
+select -assert-count 1 w:integer_null_range_out a:top_bound=2'bs11 %i
+
+# natural: scalar type
+select -assert-count 1 w:natural_in a:bottom_bound=31'b0000000000000000000000000000000 %i
+select -assert-count 1 w:natural_in a:top_bound=31'b1111111111111111111111111111111 %i
+select -assert-count 1 w:natural_out a:bottom_bound=31'b0000000000000000000000000000000 %i
+select -assert-count 1 w:natural_out a:top_bound=31'b1111111111111111111111111111111 %i
+
+# positive: scalar type
+select -assert-count 1 w:positive_in a:bottom_bound=31'b0000000000000000000000000000001 %i
+select -assert-count 1 w:positive_in a:top_bound=31'b1111111111111111111111111111111 %i
+select -assert-count 1 w:positive_out a:bottom_bound=31'b0000000000000000000000000000001 %i
+select -assert-count 1 w:positive_out a:top_bound=31'b1111111111111111111111111111111 %i
+
+
+# integer size changed in VHDL 2019
+design -reset
+read -vhdl2019 bounds.vhd
+hierarchy -top test
+
+# integer: scalar type
+select -assert-count 1 w:integer_in a:bottom_bound=64'b1000000000000000000000000000000000000000000000000000000000000000 %i
+select -assert-count 1 w:integer_in a:top_bound=64'b0111111111111111111111111111111111111111111111111111111111111111 %i
+select -assert-count 1 w:integer_out a:bottom_bound=64'b1000000000000000000000000000000000000000000000000000000000000000 %i
+select -assert-count 1 w:integer_out a:top_bound=64'b0111111111111111111111111111111111111111111111111111111111111111 %i
+
+# natural: scalar type
+select -assert-count 1 w:natural_in a:bottom_bound=63'b000000000000000000000000000000000000000000000000000000000000000 %i
+select -assert-count 1 w:natural_in a:top_bound=63'b111111111111111111111111111111111111111111111111111111111111111 %i
+select -assert-count 1 w:natural_out a:bottom_bound=63'b000000000000000000000000000000000000000000000000000000000000000 %i
+select -assert-count 1 w:natural_out a:top_bound=63'b111111111111111111111111111111111111111111111111111111111111111 %i
+
+# positive: scalar type
+select -assert-count 1 w:positive_in a:bottom_bound=63'b000000000000000000000000000000000000000000000000000000000000001 %i
+select -assert-count 1 w:positive_in a:top_bound=63'b111111111111111111111111111111111111111111111111111111111111111 %i
+select -assert-count 1 w:positive_out a:bottom_bound=63'b000000000000000000000000000000000000000000000000000000000000001 %i
+select -assert-count 1 w:positive_out a:top_bound=63'b111111111111111111111111111111111111111111111111111111111111111 %i
+
+design -reset
+read -sv bounds.sv
+hierarchy -top test
+
+select -assert-count none a:bottom_bound
+select -assert-count none a:top_bound