[oc] VHDL code for following condition needed

[rshlp@indiainfo.com]

Hi,

Assume you have a control pin A [Integer], a clk and output CNT.
Now, depending on the value of A, CNT should count from A value.

That is, 
if A = 0, the counter should count from 0 to 3.
if A = 1, the counter should count from 4 to 7.
if A = 5, the counter should count from 20 to 23.
if A = 2, the counter should count from 8 to 11.
... and so on.

Is there any way to write a general code for the above condition.
Thanks in advance.

RV
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