Hello Kai,
I went through the example code you gave.
But iam unable to implement your description with those codes.
could you give me a little description of that method.

I couldnt find how the two counters (ctrA, ctrB) are been used to achieve this. By knowing this, i think, i could trace out the necessity of the AND, OR, XOR logic's that were been used.

Could you assist me to know that.

Thanking you,
Suresh.