HW4_Solution

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HW #4 - Solution CECS 301 - Spring 2022 © Amin Rezaei Question 2: When the bus master is busy to carry out its own internal tasks, the bus protocol requires the bus master to hold the address, control, and data values as long as it is busy. The following figure illustrates an example where the bus master becomes busy in clock cycles 2, 9 and 10 while writing data into a slave. Draw corresponding Address and Write Data (WData) rows. At which clock cycle each WData is written? WD1, WD2, WD3, and WD4 are written at the clock cycles 5, 6, 7, and 9 respectively. The diagram does not tell us about the written time of WD5 and WD6. Question 3: Draw bus arbitration table and state machine of an arbiter with three bus masters where bus master 1 has the highest priority followed by bus masters 2 and 3.
HW #4 - Solution CECS 301 - Spring 2022 © Amin Rezaei Question 4: Considering the following information, complete the given topology comparison table. Reliability: Interconnection networks should be able to send messages through alternative paths when some faults are detected. Reliability of a topology can be seen as high, medium, and low based on the number of faults that it can tolerate. Planarity: If a topology can be implemented in two-dimensional plane, we call it planar; otherwise, it is not planar. Star Topology: In a star topology, all the nodes are connected to a single management node called hub. Star Topology Topology Cost Speed Contention Reliability Planarity Bus Lowest Low Highest Low Planar P2P Highest Highest Lowest Highest Not Planar Ring Low Low Medium Low Planar Mesh Low Medium Low High Planar Torus Low Medium to High Low High Not Planar H-Tree Low Medium to High Low Medium Planar Star Medium High Medium Low Planar Note: In star topology, hub is costly for large systems. Also, hub is the hot-spot and may become saturated. In addition, hub is a single point of failure. Question 5: A suggested DOR algorithm for mesh topology restricts all turns to the west direction. This means west direction should be taken first if needed in the proposed route. (a) For the given topology, highlight the path that a message takes from source node 7 to destination node 13. (b) Can the given deadlock situation happen in this system? No. Since there should not be any turn to the west, message 3 cannot be waited for message 4 to proceed.
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