diff --git a/sdk/include/psdk/usb200.h b/sdk/include/psdk/usb200.h
index 8babb868e2d..c2afc73b815 100644
--- a/sdk/include/psdk/usb200.h
+++ b/sdk/include/psdk/usb200.h
@@ -279,6 +279,14 @@ C_ASSERT(sizeof(USB_HUB_STATUS_AND_CHANGE) == sizeof(ULONG));
 #define USB_20_HUB_DESCRIPTOR_TYPE  0x29
 #define USB_30_HUB_DESCRIPTOR_TYPE  0x2A
 
+#define USB_REQUEST_CLEAR_TT_BUFFER     0x08
+#define USB_REQUEST_RESET_TT            0x09
+#define USB_REQUEST_GET_TT_STATE        0x0A
+#define USB_REQUEST_STOP_TT             0x0B
+
+#define USB_REQUEST_SET_HUB_DEPTH       0x0C
+#define USB_REQUEST_GET_PORT_ERR_COUNT  0x0D
+
 #define USB_DEVICE_CLASS_RESERVED             0x00
 #define USB_DEVICE_CLASS_AUDIO                0x01
 #define USB_DEVICE_CLASS_COMMUNICATIONS       0x02