grt: update readme

Signed-off-by: Eder Monteiro <[email protected]>

Author: eder-matheus

src/grt/README.md

@@ -24,6 +24,7 @@ global_route
     [-congestion_report_iter_step steps]
     [-grid_origin {x y}]
     [-critical_nets_percentage percent]
+    [-skip_large_fanout_nets fanout]
     [-allow_congestion]
     [-verbose]
     [-start_incremental]
@@ -42,6 +43,7 @@ global_route
 | `-congestion_report_iter_step` | Set the number of iterations to report. The default value is `0`, and the allowed values are integers `[0, MAX_INT]`. |
 | `-grid_origin` | Set the (x, y) origin of the routing grid in DBU. For example, `-grid_origin {1 1}` corresponds to the die (0, 0) + 1 DBU in each x--, y- direction. |
 | `-critical_nets_percentage` | Set the percentage of nets with the worst slack value that are considered timing critical, having preference over other nets during congestion iterations (e.g. `-critical_nets_percentage 30`). The default value is `0`, and the allowed values are integers `[0, MAX_INT]`. |
+| `-skip_large_fanout_nets` | Skips routing for nets with a fanout higher than the specified limit. Nets exceeding this pin count threshold will be ignored by the global router. The default value is `-1`, and the allowed values are integers `[0, MAX_INT]`. |
 | `-allow_congestion` | Allow global routing results to be generated with remaining congestion. The default is false. |
 | `-verbose` | This flag enables the full reporting of the global routing. |
 | `-start_incremental` | This flag initializes the GRT listener to get the net modified. The default is false. |