Added raise_stall.

upf.md

@@ -548,6 +548,46 @@ This page describes the changes to the IEEE standard 1801 (UPF 2.1) that were ma
 
 **Example:** *set_supply_voltage VDD -voltage 1.0*
 
+
+#### raise_stall
+
+<table width=100%>
+<tr>
+  <th>Purpose</th>
+  <td colspan=2>Specifies a signal that needs to be driven high or low under certain conditions, e.g. if a power mode has not yet reached.</td>
+</tr>
+<tr>
+  <th>Syntax</th>
+  <td colspan=2><b>raise_stall</b> <i>strategy_name</i>
+<br><b>-active</b> <i>&lt;high|low&gt;</i>
+<br>[<b>-no_clock_gating</b> |
+<br><b>-net</b> {<i>signal</i>}
+<br><b>-when</b> {<i>boolean_expression</i>}
+</td>
+</tr>
+<tr>
+<th rowspan=10>Arguments</th>
+<td><i>strategy_name</i></td>
+<td>Simple name of the strategy.</td>
+</tr>
+<tr>
+<td><b>-active</b> <i>&lt;high|low&gt;</i></td>
+<td>Is the stall signal high-active or low-active?
+</tr>
+<tr>
+<td><b>-net</td>
+<td>Logic wire the stall connects to.
+</td>
+</tr>
+<tr>
+<td><b>-when</b> {<i>boolean_expression</i>}</td>
+<td>Condition when the stall shall be active.
+</td>
+</tr>
+</table>
+
+**Example:** *raise_stall pipeline_stall -active high -net cpu/stall -when {cpu/alu/func == 8'b3 && division_domain != POWER_STATE_ACTIVE}*
+
 #### update_device_schedule
 
 <table width=100%>