?? types.vhd
字號:
alias RV: MVL7_VECTOR (R'length-1 downto 0) is R;
variable result: MVL7_VECTOR (L'length-1 downto 0);
--synopsys synthesis_on
begin
--synopsys synthesis_off
assert L'length = R'length;
for i in result'range loop
result (i) := tbl_NOT(tbl_OR(LV (i), RV (i)));
end loop;
return result;
--synopsys synthesis_on
end "nor";
function "xor" (L, R: MVL7_VECTOR) return MVL7_VECTOR is
-- pragma built_in SYN_XOR
--synopsys synthesis_off
alias LV: MVL7_VECTOR (L'length-1 downto 0) is L;
alias RV: MVL7_VECTOR (R'length-1 downto 0) is R;
variable result: MVL7_VECTOR (L'length-1 downto 0);
--synopsys synthesis_on
begin
--synopsys synthesis_off
assert L'length = R'length;
for i in result'range loop
result (i) := tbl_XOR(LV (i), RV (i));
end loop;
return result;
--synopsys synthesis_on
end "xor";
function nxor (L, R: MVL7_VECTOR) return MVL7_VECTOR is
-- pragma built_in SYN_XNOR
--synopsys synthesis_off
alias LV: MVL7_VECTOR (L'length-1 downto 0) is L;
alias RV: MVL7_VECTOR (R'length-1 downto 0) is R;
variable result: MVL7_VECTOR (L'length-1 downto 0);
--synopsys synthesis_on
begin
--synopsys synthesis_off
assert L'length = R'length;
for i in result'range loop
result(i) := tbl_NOT(tbl_XOR(LV(i), RV(i)));
end loop;
return result;
--synopsys synthesis_on
end nxor;
function "not" (R: MVL7_VECTOR) return MVL7_VECTOR is
-- pragma built_in SYN_NOT
--synopsys synthesis_off
alias RV: MVL7_VECTOR (R'length-1 downto 0) is R;
variable result: MVL7_VECTOR (R'length-1 downto 0);
--synopsys synthesis_on
begin
--synopsys synthesis_off
for i in result'range loop
result (i) := tbl_NOT( RV(i) );
end loop;
return result;
--synopsys synthesis_on
end "not";
function buf (R: MVL7_VECTOR) return MVL7_VECTOR is
-- pragma built_in SYN_BUF
--synopsys synthesis_off
alias RV: MVL7_VECTOR (R'length-1 downto 0) is R;
variable result: MVL7_VECTOR (R'length-1 downto 0);
--synopsys synthesis_on
begin
--synopsys synthesis_off
for i in result'range loop
result(i) := tbl_BUF( RV(i) );
end loop;
return result;
--synopsys synthesis_on
end buf;
-----------------------------------------------------------------------
--
-- resolution functions for wired signals
--
-----------------------------------------------------------------------
function WiredX (V: MVL7_VECTOR) return MVL7 is
-- pragma resolution_method three_state
variable result: MVL7;
begin
--synopsys synthesis_off
result := 'Z';
for i in V'range loop
result := tbl_WIREDX(result, V(i));
exit when result = 'X';
end loop;
return result;
--synopsys synthesis_on
end WiredX;
function WiredOr (V: MVL7_VECTOR) return MVL7 is
variable result: MVL7;
begin
--synopsys synthesis_off
result := 'Z';
for i in V'range loop
result := tbl_WIREDOr(result, V(i));
exit when result = '1';
end loop;
return result;
--synopsys synthesis_on
end WiredOr;
-- synopsys synthesis_off
-----------------------------------------------------------------------
--
-- conversion functions for driving various types
--
-----------------------------------------------------------------------
function Drive (V: BusX) return MVL7_VECTOR is
begin
return MVL7_VECTOR(V);
end Drive;
function Drive (V: MVL7_VECTOR) return BusX is
begin
return BusX(V);
end Drive;
-----------------------------------------------------------------------
--
-- conversion functions for sensing various types
--
-- (the second argument allows the user to specify the value to
-- be returned when the network is undriven)
--
-----------------------------------------------------------------------
function Sense (V: MVL7; vZ: MVL7) return MVL7 is
begin
if V = 'Z' then
return vZ;
else
return V;
end if;
end Sense;
function Sense (V: MVL7_VECTOR; vZ: MVL7) return MVL7_VECTOR is
alias Value: MVL7_VECTOR (V'length-1 downto 0) is V;
variable Result: MVL7_VECTOR (V'length-1 downto 0);
begin
for i in Value'range loop
if ( Value(i) = 'Z' ) then
Result(i) := vZ;
else
Result(i) := Value(i);
end if;
end loop;
return Result;
end Sense;
function Sense (V: BusX; vZ: MVL7) return MVL7_VECTOR is
alias Value: BusX (V'length-1 downto 0) is V;
variable Result: MVL7_VECTOR (V'length-1 downto 0);
begin
for i in Value'range loop
if ( Value(i) = 'Z' ) then
Result(i) := vZ;
else
Result(i) := Value(i);
end if;
end loop;
return Result;
end Sense;
-- synopsys synthesis_on
-----------------------------------------------------------------------
--
-- Function: BVtoMVL7V
--
-- Purpose: Conversion function from BIT_VECTOR to MVL7_VECTOR
--
-- Mapping: 0 --> 0
-- 1 --> 1
--
-----------------------------------------------------------------------
function BVtoMVL7V (V: BIT_VECTOR) return MVL7_VECTOR is
-- pragma built_in SYN_FEED_THRU
--synopsys synthesis_off
alias Value: BIT_VECTOR (V'length-1 downto 0) is V;
variable Result: MVL7_VECTOR (V'length-1 downto 0);
--synopsys synthesis_on
begin
--synopsys synthesis_off
for i in Value'range loop
if ( Value(i) = '0' ) then
Result(i) := '0';
else
Result(i) := '1';
end if;
end loop;
return Result;
--synopsys synthesis_on
end BVtoMVL7V;
-----------------------------------------------------------------------
--
-- Function: MVL7VtoBV
--
-- Purpose: Conversion function from MVL7_VECTOR to BIT_VECTOR
--
-- Mapping: 0, L --> 0
-- 1, H --> 1
-- X --> vX if Xflag is TRUE
-- X --> 0 if Xflag is FALSE
-- Z --> vZ if Zflag is TRUE
-- Z --> 0 if Zflag is FALSE
--
-----------------------------------------------------------------------
function MVL7VtoBV (V: MVL7_VECTOR
--synopsys synthesis_off
; vX, vZ: BIT := '0'; Xflag, Zflag: BOOLEAN := FALSE
--synopsys synthesis_on
) return BIT_VECTOR is
-- pragma built_in SYN_FEED_THRU
--synopsys synthesis_off
alias Value: MVL7_VECTOR (V'length-1 downto 0) is V;
variable Result: BIT_VECTOR (V'length-1 downto 0);
--synopsys synthesis_on
begin
--synopsys synthesis_off
for i in Value'range loop
case Value(i) is
when '0' | 'L' =>
Result(i) := '0';
when '1' | 'H' =>
Result(i) := '1';
when 'X' | 'W' =>
if ( Xflag ) then
Result(i) := vX;
else
Result(i) := '0';
assert FALSE
report "MVL7VtoBV: X --> 0"
severity WARNING;
end if;
when others =>
if ( Zflag ) then
Result(i) := vZ;
else
Result(i) := '0';
assert FALSE
report "MVL7VtoBV: Z --> 0"
severity WARNING;
end if;
end case;
end loop;
return Result;
--synopsys synthesis_on
end MVL7VtoBV;
-----------------------------------------------------------------------
--
-- Function: BITtoMVL7
--
-- Purpose: Conversion function from BIT to MVL7
--
-- Mapping: 0 --> 0
-- 1 --> 1
--
-----------------------------------------------------------------------
function BITtoMVL7 (V: BIT) return MVL7 is
variable Result: MVL7;
-- pragma built_in SYN_FEED_THRU
begin
if ( V = '0' ) then
Result := '0';
else
Result := '1';
end if;
return Result;
end BITtoMVL7;
-----------------------------------------------------------------------
--
-- Function: MVL7toBIT
--
-- Purpose: Conversion function from MVL7 to BIT
--
-- Mapping: 0, L --> 0
-- 1, H --> 1
-- X --> vX if Xflag is TRUE
-- X --> 0 if Xflag is FALSE
-- Z --> vZ if Zflag is TRUE
-- Z --> 0 if Zflag is FALSE
--
-----------------------------------------------------------------------
function MVL7toBIT (V: MVL7
--synopsys synthesis_off
; vX, vZ: BIT := '0'; Xflag, Zflag: BOOLEAN := FALSE
--synopsys synthesis_on
) return BIT is
-- pragma built_in SYN_FEED_THRU
variable Result: BIT;
begin
--synopsys synthesis_off
case V is
when '0' | 'L' =>
Result := '0';
when '1' | 'H' =>
Result := '1';
when 'X' | 'W' =>
if ( Xflag ) then
Result := vX;
else
Result := '0';
assert FALSE
report "MVL7toBIT: X --> 0"
severity WARNING;
end if;
when others =>
if ( Zflag ) then
Result := vZ;
else
Result := '0';
assert FALSE
report "MVL7toBIT: Z --> 0"
severity WARNING;
end if;
end case;
return Result;
--synopsys synthesis_on
end MVL7toBIT;
end TYPES;
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