CSCI 255, ENGR 274, ECE 212 -- 7 November, 2000

Announcements

• Quiz 2
  • Tuesday, 14 November
  • Chapters 3 to 5
• less Partial Homework 6 solution
• Homework 7
• Homework 8
• Homework 9

State transition tables and flipflops

• Spreadsheet specification
• Input for D flip-flops
• Output for D flip-flops
• Input for JK flip-flops
• Output for JK flip-flops

Two types of finite state machines

Moore machine

Output determined by present state

Mealy machine

Output determined by present state and present input

See Figures 8.23 and 8.24 on page 403 for more information.

ABEL

• Hardware description language
  • C-based
  • a poofy language according to Wayne Lang
• Program sections
  • module
  • title
    • optional
  • declarations
    • device
      • optional PLD device delcaration
    • PIN's
      • com -- combinational
      • neg -- signal is inverted
      • pos -- signal isn't inverted
      • reg -- register
    • node
      • internal signals
    • State registers
      • definition of state in terms of pins -- pages 400 & 401
  • equations / truth tables / state diagrams

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    not

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    and

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    or

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    exclusive or

• ABEL description
  • ABEL description in PDF

Xilinx state machine input

• Xilinx state machine description

VHDL

• VHDL description
  • VHDL description in PDF