Computer Science 237 Computer Organization Williams College Fall 2005

Announcements

• Mary wants the tables back in the digital logic lab - please tear down your memory circuits.
• We will do course evalulations on Wednesday.
• Phase 3 well underway, hopefully. Again, I would like to meet with each group early this week to go over your phase 2 performance and to discuss your phase 3 plans. No formal signups. I will be around as much as I can. The exception is late Tuesday afternoon (after 2:30).

Agenda

• Microcode questions/answers
  • Phase 2 stats
  • Running timing tests on your own microcode: the mictest script
  • Add "markers" to your microcode to watch instructions go by in a trace.
• Cache memory
  • direct mapped, fully associative, n-way set associative
  • replacement policies
  • 3 C's of cache misses: compulsory, conflict, capacity
  • read policies
  • write policies - write-through and write-back
  • victim cache
  • multiprocessor issues - cache coherency