DPGEN_ADSB2F - Adder/Substractor Macro-Generator
#include <genlib.h>
void GENLIB_MACRO (DPGEN_ADSB2F, char *modelname, long
flags, long N);
Generate a N bits adder/substractor named
modelname.
How it works :
- •
- if the add_sub signal is set to '0' an addition is performed, otherwise
it's a substraction.
- •
- Operation can be either signed or unsigned. In unsigned mode c31 is the
overflow, in unsigned mode you have to compute overflow by XORing
c31 and c30.
- 1.
- add_sub : select addition or substraction (input, 1 bit).
- 2.
- c31 : carry out. In unsigned mode, this is the overflow (output, 1
bits).
- 3.
- c30 : used to compute overflow in signed mode : overflow := c31 xor c30
(output, 1 bits).
- 4.
- i1 : first operand (input, N bits).
- 5.
- i0 : second operand (input, N bits).
- 6.
- q : output (N bits).
- 7.
- vdd : power.
- 8.
- vss : ground.
GENLIB_MACRO(DPGEN_ADSB2F, "model_adsb2f_32"
, F_BEHAV|F_PLACE
, 32
);
GENLIB_LOINS( "model_adsb2f_32"
, "instance1_adsb2f_32"
, "add_sub"
, "c32"
, "c31"
, "i1[31:0]"
, "i0[31:0]"
, "q[31:0]"
, "vdd", "vss", NULL
);