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hey guys this video i made for my college assignment. why to waste mehnat ? that's why am uploading here.
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you can use this as answer for Explain Distributed Arbitration?
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Second approach to bus arbitration is Distributed Arbitration
In distributed arbitration, all devices participate in the selection of the next bus master.
In this scheme each device on the bus is assigned a4-bit identification number.
The number of devices connected on the bus when one or more devices request for the control of bus, they assert the start-arbitration signal and place their 4-bit ID numbers on arbitration lines, ARB0 through ARB3.
These four arbitration lines are all open-collector. Therefore, more than one device can place their 4-bit ID number to indicate that they need to control of bus. If one device puts 1 on the bus line and another device puts 0 on the same bus line, the bus line status will be 0. Device reads the status of all lines through inverters buffers so device reads bus status 0as logic 1. Scheme the device having highest ID number has highest priority.
When two or more devices place their ID number on bus lines then it is necessary to identify the highest ID number on bus lines then it is necessary to identify the highest ID number from the status of bus line. Consider that two devices A and B, having ID number 1 and 6, respectively are requesting the use of the bus.
Device A puts the bit pattern 0001, and device B puts the bit pattern 0110. With this combination the status of bus-line will be 1000; however because of inverter buffers code seen by both devices is 0111.
Each device compares the code formed on the arbitration line to its own ID, starting from the most significant bit. If it finds the difference at any bit position, it disables its drives at that bit position and for all lower-order bits.
It does so by placing a 0 at the input of their drive. In our example, device detects a different on line ARB2 and hence it disables its drives on line ARB2, ARB1 and ARB0. This causes the code on the arbitration lines to change to 0110. This means that device B has won the race.
The decentralized arbitration offers high reliability because operation of the bus is not dependent on any single device.
no central authority
each module has a code for access control and modules act together to share the bus
purpose: both these methods are aim to assign one device as master
one device means either i/o module or processor
master initiates a read/write operation with same other device