MACHXO2_REFRESH_USEC  160 drivers/fpga/machxo2-spi.c 	tx[1].delay_usecs = MACHXO2_REFRESH_USEC;
MACHXO2_REFRESH_USEC  320 drivers/fpga/machxo2-spi.c 		tx[1].delay_usecs = MACHXO2_REFRESH_USEC;