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Chapter 2: Custom single-purpose processors - page 18 / 29

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18

Embedded Systems Design: A Unified Hardware/Software Introduction, (c) 2000 Vahid/Givargis

Controller state table for the GCD example

Inputs

Outputs

Q3

Q2

Q1

Q0

x_neq_y

x_lt_y

go_i

I3

I2

I1

I0

x_sel

y_sel

x_ld

y_ld

d_ld

0

0

0

0

*

*

*

0

0

0

1

X

X

0

0

0

0

0

0

1

*

*

0

0

0

1

0

X

X

0

0

0

0

0

0

1

*

*

1

0

0

1

1

X

X

0

0

0

0

0

1

0

*

*

*

0

0

0

1

X

X

0

0

0

0

0

1

1

*

*

*

0

1

0

0

0

X

1

0

0

0

1

0

0

*

*

*

0

1

0

1

X

0

0

1

0

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1

0

1

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1

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1

1

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X

0

0

0

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1

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1

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1

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1

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1

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