Experiment 6 - The Gated D Latch (DE Latch)
How can you give the D latch its memory back?
To do this you are adding the
ENABLE input of the circuit.
The ENABLE is added
to the D latch as shown in the circuit diagram.
Simular to the RS-E latch in experiment 4, it
changes the behaviour of the latch...
Circuit Diagram Gated D Latch.
Symbol Gated D Latch in Circuit Diagram.
As long as E = 0,
the latch is open and you switch between the two results back and forth
using D .
As soon as E = 1,
you close the latch and the last result is stored.
Now the D
input no longer influences the result........
until E goes back to 0.
Circuit of a Gated D Latch.
Try this out a few times with the circuit shown.
Although you introduced the
E input as a stopgap,
from now on it plays a central role.
In the next experiment, you begin to understand why.