From 5f6a31d2589691e8010dd0a2b8570c2203a8ca0b Mon Sep 17 00:00:00 2001
From: xingchen <1098756313@qq.com>
Date: Fri, 25 Sep 2026 11:57:22 +0800
Subject: [PATCH] feat: add rtl/alarm_latch.v

---
 rtl/alarm_latch.v | 15 +++++++++++++++
 1 file changed, 15 insertions(+)
 create mode 100644 rtl/alarm_latch.v

diff --git a/rtl/alarm_latch.v b/rtl/alarm_latch.v
new file mode 100644
index 0000000..a0fba00
--- /dev/null
+++ b/rtl/alarm_latch.v
@@ -0,0 +1,15 @@
+module alarm_latch (
+    input wire clk, input wire rst_n, input wire timeout,
+    input wire heartbeat_rise, input wire acknowledge,
+    output reg alarm
+);
+  reg recovered;
+  always @(posedge clk or negedge rst_n) begin
+    if (!rst_n) begin alarm <= 0; recovered <= 0; end
+    else if (timeout && !heartbeat_rise) begin alarm <= 1; recovered <= 0; end
+    else begin
+      if (heartbeat_rise) recovered <= 1;
+      if (acknowledge && recovered) begin alarm <= 0; recovered <= 0; end
+    end
+  end
+endmodule