From fed844f6496cefcd7a878bc111a307b8b5a742da Mon Sep 17 00:00:00 2001
From: xingchen <1098756313@qq.com>
Date: Fri, 25 Sep 2026 11:57:18 +0800
Subject: [PATCH] feat: add rtl/fault_filter.vhd

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

diff --git a/rtl/fault_filter.vhd b/rtl/fault_filter.vhd
new file mode 100644
index 0000000..c088cd1
--- /dev/null
+++ b/rtl/fault_filter.vhd
@@ -0,0 +1,15 @@
+library ieee;
+use ieee.std_logic_1164.all;
+
+entity fault_filter is
+  port (valid : in std_logic;
+        mask_in : in std_logic_vector(2 downto 0);
+        mask_out : out std_logic_vector(2 downto 0);
+        any_fault : out std_logic);
+end entity;
+
+architecture rtl of fault_filter is
+begin
+  mask_out <= mask_in when valid = '1' else (others => '0');
+  any_fault <= (mask_in(0) or mask_in(1) or mask_in(2)) and valid;
+end architecture;