/*---------------------------------------------------------------------------------------------
* (function: combine_nets)
* // output net is a net with a driver
* // input net is a net with all the fanouts
* The lasting one is input, and output disappears
*-------------------------------------------------------------------------------------------*/
void combine_nets(nnet_t *output_net, nnet_t* input_net, netlist_t *netlist)
{
/* copy the driver over to the new_net */
if (output_net->driver_pin)
{
/* IF - there is a pin assigned to this net, then copy it */
add_driver_pin_to_net(input_net, output_net->driver_pin);
}
/* in case there are any fanouts in output net (should only be zero and one nodes */
join_nets(input_net, output_net);
/* mark that this is combined */
input_net->combined = TRUE;
/* special cases for global nets */
if (output_net == netlist->zero_net)
{
netlist->zero_net = input_net;
}
else if (output_net == netlist->one_net)
{
netlist->one_net = input_net;
}
/* free the driver net */
free_nnet(output_net);
}
/*---------------------------------------------------------------------------------------------
* (function: instantiate_buffer )
* Buffers just pass through signals
*-------------------------------------------------------------------------------------------*/
void instantiate_buffer(nnode_t *node, short mark, netlist_t *netlist)
{
int width = node->num_input_pins;
int i;
/* for now we just pass the signals dierectly through */
for (i = 0; i < width; i++)
{
int idx_2_buffer = node->input_pins[i]->pin_net_idx;
/* join all fanouts of the output net with the input pins net */
join_nets(node->input_pins[i]->net, node->output_pins[i]->net);
/* erase the pointer to this buffer */
node->input_pins[i]->net->fanout_pins[idx_2_buffer] = NULL;
}
}
