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[core] add code comments and fixed some bugs

This commit is contained in:
tangxifan 2024-06-28 12:21:33 -07:00
parent 53ba2f0c29
commit f5b6774eb0
1 changed files with 18 additions and 0 deletions
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18
openfpga/src/annotation/route_clock_rr_graph.cpp
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@ -268,6 +268,21 @@ static int route_spine_taps(
* des_spine_bottom[0...N] * des_spine_bottom[0...N]
* *
* <-------------------------------------------- direction to walk through * <-------------------------------------------- direction to walk through
*
*
* On each stop, we expand the spine to switch points and tap points
* - If the previous stop is used (connection to des_spines are required), then the current stop should be connected to the previous stop
* - If previous stop is not used, while the des_spines are required to connect, then the current stop should be connected to the previous stop
* - Only when previous stops and des_spines are not used, the current stop will be NOT connected to the previous stop
*
* des_spine_top[i]
* ^
* |
* spine_curr_stop ---->+->spine_prev_stop
* |
* v
* des_spine_bottom[i]
* *
*******************************************************************/ *******************************************************************/
static int rec_expand_and_route_clock_spine( static int rec_expand_and_route_clock_spine(
@ -303,6 +318,9 @@ static int rec_expand_and_route_clock_spine(
for (size_t icoord = 0; icoord < spine_coords.size(); ++icoord) { for (size_t icoord = 0; icoord < spine_coords.size(); ++icoord) {
vtr::Point<int> switch_point_coord = spine_coords[icoord]; vtr::Point<int> switch_point_coord = spine_coords[icoord];
bool curr_stop_usage = false; bool curr_stop_usage = false;
if (icoord == 0) {
prev_stop_usage = true; /* The first stop is always used */
}
/* Expand on the switching point here */ /* Expand on the switching point here */
for (ClockSwitchPointId switch_point_id : for (ClockSwitchPointId switch_point_id :
clk_ntwk.find_spine_switch_points_with_coord(curr_spine, switch_point_coord)) { clk_ntwk.find_spine_switch_points_with_coord(curr_spine, switch_point_coord)) {