Vhdl library_use declaration, Altmult_add ports, Vhdl library_use declaration -12 – Altera Integer Arithmetic IP User Manual
Page 113: Altmult_add ports -12
To view the VHDL component declaration for the megafunction, refer to the VHDL Design File (.vhd)
altera_mf_components.vhd in the
directory.
VHDL LIBRARY_USE Declaration
The VHDL LIBRARY-USE declaration is not required if you use the VHDL Component Declaration.
LIBRARY altera_mf;
USE altera_mf.altera_mf_components.all;
ALTMULT_ADD Ports
The following tables list the input and output ports for the ALTMULT_ADD megafunction.
Note: For Arria V, Cyclone V, and Stratix V devices, each register can only select between two asynchro‐
nous signals (
ACLR0
,
ACLR1
) and three clock/enable pairs (
CLOCK0/ENA0
,
CLOCK1/ENA1
,
CLOCK2/
ENA2
).
Table 9-2: ALTMULT_ADD Megafunction Input Ports
Port Name
Required
Description
dataa[]
Yes
Data input to the multiplier. Input port
[NUMBER_OF_
MULTIPLIERS * WIDTH_A - 1..0]
wide.
datab[]
Yes
Data input to the multiplier. Input port
[NUMBER_OF_
MULTIPLIERS * WIDTH_B - 1..0]
wide.
clock[]
No
Clock input port
[0..3]
to the corresponding register. This port
can be used by any register in the megafunction.
aclr[]
No
Input port
[0..3]
. Asynchronous clear input to the
corresponding register.
ena[]
No
Input port
[0..3]
. Clock enable for the corresponding clock[]
port.
signa
No
Specifies the numerical representation of the
dataa[]
port. If the
signa
port is high, the multiplier treats the
dataa[]
port as a
signed two's complement number. If the
signa
port is low, the
multiplier treats the
dataa[]
port as an unsigned number.
signb
No
Specifies the numerical representation of the
datab[]
port. If the
signb
port is high, the multiplier treats the
datab[]
port as a
signed two's complement number. If the
signb
port is low, the
multiplier treats the
datab[]
port as an unsigned number.
Table 9-3: ALTMULT_ADD Megafunction Input Ports (Stratix III and Stratix IV Devices Only)
Port Name
Required
Description
Ports Available in Stratix III and Stratix IV devices only
9-12
VHDL LIBRARY_USE Declaration
UG-01063
2014.12.19
Altera Corporation
ALTMULT_ADD (Multiply-Adder)