MultiCycle Processor

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Multi-Cycle Processor
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Stage 0 Instruction Fetch
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Stage 1 - Decode
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Stage 2 - Execution
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Stage 3 Write Back
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Stage 4 Write To PC
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Stage 5 Memory Access
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Control Comparison
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Carry Look Ahead Equations

• Generate gi (ai and bi)
• Propagate pi (ai or bi)
• Carry ci1 (gi or pi and ci)

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4-Bit Carry Adder
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Two-Pass Assembler

• Pass One
• Only first command of each line read
• If command is a known command go to next line
• Else, the command is identified as a Label
• Label names and addresses of next recognized
  command are kept in a list
• Pass Two
• First commands of each line are again read in
• If command is a known command, process data
• If Labels are read in as part of a commands data,
  the address value for the label is looked up
• All Decimal numbers are converted into Binary
• Else, We can ignore the Label (or comments)