An 8-way Demultiplexor chip outputs the given input to certain output pin, which is specified by selector bit.
Width of selector bit = (log 8) to the base 2 = 3
Chip name: DMux8Way
Inputs: in, sel[3]
Outputs: a, b, c, d, e, f, g, h
Function: If sel=000 then {a=in, b=c=d=e=f=g=h=0}
else if sel=001 then {b=in, a=c=d=e=f=g=h=0}
else if sel=010 ...
...
else if sel=111 then {h=in, a=b=c=d=e=f=g=0}.
Abstraction of 8-way Demultiplexor Chip - Representation
Implementation of DMux8Way Chip in HDL
The function in the above abstraction can help in the implementation of DMux8Way Chip.
You can use the DMux4Way Chip that you've built earlier.
CHIP DMux8Way {
IN in, sel[3];
OUT a, b, c, d, e, f, g, h;
PARTS:
DMux(in=in, sel=sel[2], a=abcd, b=efgh);
DMux4Way(in=abcd, sel=sel[0..1], a=a, b=b, c=c, d=d);
DMux4Way(in=efgh, sel=sel[0..1], a=e, b=f, c=g, d=h);
}
Implementation of DMux8Way Chip in Java™
Similar to the Implementation in HDL
package CombChips;
class DMux8Way_Gate extends DMux4Way_Gate {
protected static int[] DMux8Way(int in, int sel) {
int[] arr_sel = new int[3];
int[] subarr_sel = new int[2];
System.arraycopy(arr_sel, 1, subarr_sel, 0, subarr_sel.length);
int[] temp = DMux(in, arr_sel[0]);
int[] temp1 = DMux4Way(temp[0], subarr_sel);
int[] temp2 = DMux4Way(temp[1], subarr_sel);
int[] out = new int[4];
System.arraycopy(temp1, 0, out, 0, temp1.length);
System.arraycopy(temp2, 0, out, temp1.length, temp2.length);
return out;
}
}
