Vhdl component declaration, Vhdl library_use declaration, Lpm_mult ports – Altera Integer Arithmetic IP User Manual
Page 34: Vhdl component declaration -3, Vhdl library_use declaration -3, Lpm_mult ports -3
input [lpm_widths-1:0] sum;
output [lpm_widthp-1:0] result;
endmodule
VHDL Component Declaration
The VHDL component declaration is located in the VHDL Design File (.vhd) LPM_PACK.vhd in the
\libraries\vhdl\lpm
directory.
component LPM_MULT
generic ( LPM_WIDTHA : natural;
LPM_WIDTHB : natural;
LPM_WIDTHS : natural := 1;
LPM_WIDTHP : natural;
LPM_REPRESENTATION : string := "UNSIGNED";
LPM_PIPELINE : natural := 0;
LPM_TYPE: string := L_MULT;
LPM_HINT : string := "UNUSED");
port ( DATAA : in std_logic_vector(LPM_WIDTHA-1 downto 0);
DATAB : in std_logic_vector(LPM_WIDTHB-1 downto 0);
ACLR : in std_logic := '0';
CLOCK : in std_logic := '0';
CLKEN : in std_logic := '1';
SUM : in std_logic_vector(LPM_WIDTHS-1 downto 0) := (OTHERS => '0');
RESULT : out std_logic_vector(LPM_WIDTHP-1 downto 0));
end component;
VHDL LIBRARY_USE Declaration
The VHDL LIBRARY-USE declaration is not required if you use the VHDL Component Declaration.
LIBRARY lpm;
USE lpm.lpm_components.all;
LPM_MULT Ports
Table 4-2: LPM_MULT IP Core Input Ports
Port Name
Required
Description
dataa[]
Yes
Data input. The size of the input port depends on the
LPM_
WIDTHA
parameter value.
datab[]
Yes
Data input. The size of the input port depends on the
LPM_
WIDTHB
parameter value.
clock
No
Clock input for pipelined usage. For
LPM_PIPELINE
values
other than
0
(default), the clock port must be enabled.
clken
No
Clock enable for pipelined usage. When the
clken
port is
asserted high, the adder/subtractor operation takes place.
When the signal is low, no operation occurs. If omitted, the
default value is
1
.
UG-01063
2014.12.19
VHDL Component Declaration
4-3
LPM_MULT (Multiplier)
Altera Corporation