This hazard is present only in pipelines that write in more than one pipe stage or allow an instruction to proceed even when a previous instruction is stalled. The DLX integer pipeline writes a register only in WB and avoids this class of hazards.
The first touchscreen phone was launched in 1992 by IBM.The IBM Simon is also referred as the first smartphone.Simon is the first smartphone to be incorporated with the features of a PDA.
To stop people from inadvertently interacting with the iPhone's screen while they're on a phone call, the iPhone comes equipped with a built-in proximity sensor which automatically turns off the screen when it detects that an opaque surface is in front of it, like the user's cheek.lace the phone to your ear as you normally would or block the upper portion of your iPhone with your hand or another opaque surface. Take note that the screen will activate and light up once the proximity sensor is no longer blocked by your ear or other surface.