By Chandra Thimmannagari
Offers details in a ordinary, easy-access method in order that the booklet can act as both a brief reference for more matured engineers or as an introductory consultant for brand new engineers and school graduates.
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Additional resources for CPU Design: Answers to Frequently Asked Questions
Since L1$ in this case has 256 entries, any access for a Miss in L1$ will see Main Memory to be having 256 Sets with each Set having 64 Lines each (16K Lines/256=64 Lines) as shown in Figures 20 and 21. ) in Main Memory could be sitting in entry0 of L1$. Similarly any of the lines in Main Memory could be sitting in entry 255 of L1$. 25 26 CPU Design: Answers to Frequently Asked Questions Description for the Hit case In Figure 20 we have assumed that LineD from Set 255 is sitting in entry 0 and LineA from Set 0 is sitting in entry 255 of the L1$.
E In figure below if CPU 1 writes ‘A’ to location ‘Y’ then all future reads of location ‘Y’ will return ‘A’ if no other processor writes to location ‘Y’ after CPU 1. Figure 33: Requirement 1 for a Coherent Memory System 2. e In figure below if CPU 1 writes ‘A’ to location ‘Y’, CPU 2 will eventually be able to read value ‘A’ from location ‘Y’ as long as there are no other writes to location ‘Y’ in between the write made by CPU 1 and the read made by CPU 2. Figure 34: Requirement 2 for a Coherent Memory System 3.
Round Robin array remains untouched in the case of a Snoop Invalidate. 5. Use the following algorithm to replace an entry and update the Round Robin array in the case of a Cache Miss. 16. What do you mean by Coherency and what are the various Cache Coherency Protocols used? Coherency problem refers to inconsistency of distributed cached copies of the same cache line addressed from the shared memory. A Memory System is Coherent if it meets the following three requirements - Architecture 51 1. e In figure below if CPU 1 writes ‘A’ to location ‘Y’ then all future reads of location ‘Y’ will return ‘A’ if no other processor writes to location ‘Y’ after CPU 1.