8.8 Redesign the arbitrary counter of Section 8.5.3 using a mod-5 counter and special output decoding logic. Derive the VHDL code for this design.

8.5.3 Arbitrary-sequence counter A sequential counter circulates a predefined sequence of states. The next-state logic de termines the patterns in the sequence. For example, if we need a counter to cycle through the sequence of "000", "011", "110", "101" and "111", we can construct a combinational circuit with a function table that specifies the desired patterns, as in Table 8.1. The VHDL code is shown in Listing 8.11. Again, the code follows the basic block diagram of Figure 8.5. A conditional signal assignment statement is used to implement the function table. Listing 8.11 Arbitrary-sequence counter library ieee; use ieee. std_logic.1164. all