Computer Science 220
Assembly Language & Computer Architecture

Fall 2011, Siena College

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Agenda

• Announcements
  • Updated Lab 111 due dates: all due by Friday 4 PM. Don't wait!!
• Building Memory
  • 1 ×4 memory device
  • 4 ×4 memory device
  • 4 ×8 memory device
  • 1024 ×8 memory device
• SIMM layout
• Error detection and correction

Lecture Assignment 0x12

Due at the start of class, Thursday, November 10.

You need not submit answers to these questions, but you will have a chance to ask questions about them at the start of class.

1. Implement a 1 ×4 memory using D-type flip-flops as building blocks.
2. Implement a 4 ×4 memory using the 1 ×4 memory from the previous question as building blocks.
3. Using the error detection and correction scheme discussed in class, what 12-bit value would be stored in memory to represent the 8-bit value 0xAB?
4. Using the error detection and correction scheme discussed in class, what 8-bit value is represented by the 12-bit value 0x555? Was an error detected? If so, in which bit?
5. Using the error detection and correction scheme discussed in class, what 8-bit value is represented by the 12-bit value 0x557? Was an error detected? If so, in which bit?