![]() ![]() The gnt signal is changes only if the bus is not busy. Master 2 is awarded grant only if it requests the bus and neither master 0 nor master 1 request the bus. Master 1 is given grant only if it requests the bus and master 0 doesn't request the bus. If the first master (master 0) asserts a request, it is awarded grant. ![]() The logic for generating the grant signals (lines 41-43) is quite simple. If the bus has already been granted to an agent, even if a bigger priority master requests the bus, the current transaction must complete before the arbiter gives grant signal to another master. ![]() Arbitration of the bus is done only while it is inactive. The arbiter of this example has three request inputs and three grant outputs.Īdditionally, it has a 'busy' signal. In this entry of the tutorial, we will see a simple implementation of a VHDL arbiter. In the previous installment, we defined what a HW arbiter is. This tutorial was designed using Quartus and Modelsim-Altera ![]()
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