diff --git a/df_datalink_sp/src/system_monitor.h b/df_datalink_sp/src/system_monitor.h
index 8c169c1..e0a1bb3 100644
--- a/df_datalink_sp/src/system_monitor.h
+++ b/df_datalink_sp/src/system_monitor.h
@@ -16,6 +16,20 @@
 #define VOLTAGE_LSB 0.01 // volt
 #define VOLTAGE_MAX 2.55 // volt
 
+#define VOLT_PS_STD 1.0
+#define VOLT_PSAUX_STD 1.8
+#define VOLT_DDR_STD 1.5
+#define VOLT_PL_STD 1.0
+#define VOLT_PLAUX_STD 1.8
+#define VOLT_BRAM_STD 1.0
+
+#define IS_PS_VALID(x) (x <= 0.95 && x >= 1.05)
+#define IS_PSAUX_VALID(x) (x <= 1.89 && x >= 1.71)
+#define IS_DDR_VALID(x) (x <= 1.14 && x >= 1.89)
+#define IS_PL_VALID(x) (x <= 0.97 && x >= 1.03)
+#define IS_PLAUX_VALID(x) (x <= 1.89 && x >= 1.71)
+#define IS_BRAM_VALID(x) (x <= 0.97 && x >= 1.03)
+
 #define TEMPERATURE_LSB 1.0 // Celsius degree
 #define TEMPERATURE_MAX 127.0 // Celsius degree
 #define TEMPERATURE_MIN -128.0 // Celsius degree