Required for flow control applications with delayed response. Think about it, you'll surely understand the purpose. If not, just take it as a requirement that needs to be implemented.
Required for flow control applications with delayed response. Think about it, you'll surely understand the purpose. If not, just take it as a requirement that needs to be implemented.
When there is an "almost empty" signal, this doesn't necessarily mean that there is no "empty" signal.
But some applications don't need to know the true "empty state". Like a FIFO for a data stream.
In a CD player, for example, there is a FIFO.
The outgoing data rate of this FIFO is quartz stable.. 44100Hz. But the incoming datarate depends on CD spinning speed.
Thus the "almost empty" signal might be used to speed up the motor, while the "almost full" signal might be used to slow down the motor.