NAME¶

DPGEN_SHIFT - Shifter Macro-Generator

SYNOPSIS¶

#include <genlib.h> void GENLIB_MACRO (DPGEN_SHIFT, char * modelname, long flags , long N);

DESCRIPTION¶

Generate a N bits shifter with name modelname. How it works :

•

if the op[0] signal is set to '1' performs a right shift, performs a left shift otherwise.

•

if the op[1] signal is set to '1' performs an arithmetic shift (only meaningful in case of a right shift).

•

shamt : specifies the shift amount. The width of this signal ( Y) is computed from the operator's width : Y = ceil(log2(N)) - 1.

TERMINAL NAMES¶

1.

op : select the kind of shift (input, 2 bit).

2.

shamt : the shift amount (input, Y bits).

3.

i : value to shift (input, N bits).

4.

o : output (N bits).

5.

vdd : power.

6.

vss : ground.

EXAMPLE¶

GENLIB_MACRO(DPGEN_SHIFT, "model_shift_32",
                          F_BEHAV|F_PLACE,
                          32);

GENLIB_LOINS("model_shift_32",
             "instance1_shift_32", 
             "op[1:0]", 
             "shamt[4:0]", 
             "x[31:0]", 
             "y[31:0]", 
             "vdd", "vss", NULL);
    

SEE ALSO¶

GENLIB_MACRO(3), genlib(1)