GM_TXCR_FORCE_JAM = 1<<15, /* Bit 15: Force Jam / Flow-Control */
GM_TXCR_CRC_DIS = 1<<14, /* Bit 14: Disable insertion of CRC */
GM_TXCR_PAD_DIS = 1<<13, /* Bit 13: Disable padding of packets */
GM_TXCR_FORCE_JAM = 1<<15, /* Bit 15: Force Jam / Flow-Control */
GM_TXCR_CRC_DIS = 1<<14, /* Bit 14: Disable insertion of CRC */
GM_TXCR_PAD_DIS = 1<<13, /* Bit 13: Disable padding of packets */