EEPROM_DMA_SPEED_MASK
(((ep).scsi_id_dma_speed & EEPROM_DMA_SPEED_MASK) >> 4)
(ep).scsi_id_dma_speed &= ~EEPROM_DMA_SPEED_MASK; \
(((speed) << 4) & EEPROM_DMA_SPEED_MASK)