diff --git a/Ubiquitous/XiZi_AIoT/services/drivers/usb/components/port/xhci/xhci.c b/Ubiquitous/XiZi_AIoT/services/drivers/usb/components/port/xhci/xhci.c
index fae28bd33..5dec2e413 100644
--- a/Ubiquitous/XiZi_AIoT/services/drivers/usb/components/port/xhci/xhci.c
+++ b/Ubiquitous/XiZi_AIoT/services/drivers/usb/components/port/xhci/xhci.c
@@ -2712,24 +2712,25 @@ static void xhci_transfer ( struct xhci_host *xhci,
 			    			struct xhci_trb_transfer *trb ) {
 	struct xhci_slot *slot;
 	struct xhci_endpoint *endpoint;	
-    uintptr_t vir_addr;
+    uintptr_t vir_addr, phy_addr;
     union xhci_trb *trans_trb;
     struct xhci_ring *trans_ring;
     union xhci_trb *pending;
     uint32_t eidx;
     int rc;
 
-    vir_addr = usb_mem_data_page_phy2vir(trb->transfer);
+    phy_addr = (trb->transfer & ~(XHCI_RING_SIZE-1));
+    vir_addr = usb_mem_data_page_phy2vir(phy_addr);
 
 #if 0
     if(!vir_addr)
         return;
 #endif
 
-	trans_trb = (void *)(uintptr_t)(vir_addr);
-    trans_ring = XHCI_RING(trans_trb); /* to align addr is ring base */
+//    trans_trb = trb->transfer;
+    trans_ring = (struct xhci_ring *)(vir_addr); /* to align addr is ring base */
 	pending = &trans_ring->evt; /* preserve event trb pending to handle */
-    eidx = trans_trb - trans_ring->ring + 1; /* calculate current evt trb index */	
+    eidx = (trb->transfer - phy_addr)/sizeof(union xhci_trb) + 1; /* calculate current evt trb index */	
 
 	/* Identify slot */
 	if ( ( trb->slot > xhci->slots ) ||