T1_FS
#define T1_FS (1U<<29) /* first segment */
#define T1_FS (1U<<30) /* first segment of frame */
#define T1_FS (1U<<29) /* first descriptor of Tx frame */
#define T1_FS (1U<<29) /* first segment */
#define T1_FS (1U<<30) /* first segment of frame */