Xilinx V2.1 Uživatelský manuál stáhnout pdf (Strana 117)

State Machine 117

Xilinx Blocks

A block diagram of this type of state machine is shown below:

Figure 3-80: Moore State Machine block diagram

The block is conﬁgured by providing a next state matrix and an output array. They

are deﬁned by the state machine’s next state/output table. For example, consider the

problem of designing a state machine to recognize the pattern ’1011’ within a serial

stream of bits. The state transition diagram and equivalent transition table are shown

below.

Figure 3-81: Moore State Machine example transition diagram and table

The table lists the next state and output that result from the current state and input.

For example, if the current state is 4, the output is 1, indicating the detection of the

desired sequence, and if the input is 1, the next state is state 1.

1 2 ... 112 113 114 115 116 117 118 119 120 121 122 ... 147 148

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Xilinx V2.1 Uživatelský manuál Strana 117