diff --git a/include/microwatt_soc.h b/include/microwatt_soc.h
index 4d61d27..a224d74 100644
--- a/include/microwatt_soc.h
+++ b/include/microwatt_soc.h
@@ -39,6 +39,7 @@
 #define   SYS_REG_INFO_HAS_LITEETH 		(1ull << 4)
 #define   SYS_REG_INFO_HAS_LARGE_SYSCON	        (1ull << 5)
 #define   SYS_REG_INFO_HAS_UART1 		(1ull << 6)
+#define   SYS_REG_INFO_HAS_ARTB                 (1ull << 7)
 #define SYS_REG_BRAMINFO		0x10
 #define   SYS_REG_BRAMINFO_SIZE_MASK		0xfffffffffffffull
 #define SYS_REG_DRAMINFO		0x18
diff --git a/syscon.vhdl b/syscon.vhdl
index 05f95a7..31d8d0a 100644
--- a/syscon.vhdl
+++ b/syscon.vhdl
@@ -64,6 +64,7 @@ architecture behaviour of syscon is
     constant SYS_REG_INFO_HAS_LETH    : integer := 4;  -- Has LiteEth ethernet
     constant SYS_REG_INFO_HAS_LSYS    : integer := 5;  -- Has 6-bit address syscon
     constant SYS_REG_INFO_HAS_URT1    : integer := 6;  -- Has second UART
+    constant SYS_REG_INFO_HAS_ARTB    : integer := 7;  -- Has architected TB frequency
 
     -- BRAMINFO contains the BRAM size in the bottom 52 bits
     -- DRAMINFO contains the DRAM size if any in the bottom 52 bits