diff --git a/lib_xua/src/core/uac_hwresources.h b/lib_xua/src/core/uac_hwresources.h
index 0142a2a9..a0b82d58 100644
--- a/lib_xua/src/core/uac_hwresources.h
+++ b/lib_xua/src/core/uac_hwresources.h
@@ -4,46 +4,14 @@
 #ifndef _UAC_HWRESOURCES_H_
 #define _UAC_HWRESOURCES_H_
 
-#if XUA_USB_EN
-#include "xud.h"                 /* XMOS USB Device Layer defines and functions */
-#endif
-
-#if ((XUD_SERIES_SUPPORT != XUD_U_SERIES) && (XUD_SERIES_SUPPORT != XUD_X200_SERIES))
-
-/* XUD_L_SERIES and XUD_G_SERIES */
-
-#if (AUDIO_IO_TILE == XUD_TILE)
-/* Note: L series ref clocked clocked from USB clock when USB enabled - use another clockblock for MIDI
- * if MIDI and XUD on same tile. See XUD documentation.
- *
- * This is a clash with S/PDIF Tx but simultaneous S/PDIF and MIDI not currently supported on single tile device
- *
- */
-#define CLKBLK_MIDI        XS1_CLKBLK_1;
-#else
-#define CLKBLK_MIDI        XS1_CLKBLK_REF;
-#endif
-
-#define CLKBLK_SPDIF_TX    XS1_CLKBLK_1
-#define CLKBLK_SPDIF_RX    XS1_CLKBLK_1
-#define CLKBLK_MCLK        XS1_CLKBLK_2 /* Note, potentially used twice */
-#define CLKBLK_ADAT_RX     XS1_CLKBLK_3
-#define CLKBLK_USB_RST     XS1_CLKBLK_4 /* Clock block passed into L/G series XUD */
-#define CLKBLK_FLASHLIB    XS1_CLKBLK_5 /* Clock block for use by flash lib */
-
-#define CLKBLK_I2S_BIT     XS1_CLKBLK_3
-
-#else
-
 /* XUD_U_SERIES, XUD_X200_SERIES */
 /* Note, U-series XUD uses clock blocks 4 and 5 - see XUD_Ports.xc */
 #define CLKBLK_MIDI        XS1_CLKBLK_REF;
 #define CLKBLK_SPDIF_TX    XS1_CLKBLK_1
 #define CLKBLK_SPDIF_RX    XS1_CLKBLK_1
-#define CLKBLK_MCLK        XS1_CLKBLK_2   /* Note, potentially used twice */
+#define CLKBLK_MCLK        XS1_CLKBLK_4
 #define CLKBLK_FLASHLIB    XS1_CLKBLK_3   /* Clock block for use by flash lib */
 #define CLKBLK_ADAT_RX     XS1_CLKBLK_REF /* Use REF for ADAT_RX on U/x200 series */
-#define CLKBLK_I2S_BIT     XS1_CLKBLK_3
-#endif
+#define CLKBLK_I2S_BIT     XS1_CLKBLK_5
 
 #endif /* _UAC_HWRESOURCES_H_ */