[UVM foundation] what is transaction

transaction It's an abstract concept . Generally speaking , Data exchange in physical protocols is based on frames or packets , It is usually necessary to define various parameters in a frame or a package , The size of each package is different . Very few agreements are made on the basis of bit perhaps byte For data exchange .

Take Ethernet as an example , The size of each package is at least 64byte. This package should include the source address 、 Destination address 、 Packet type 、 The whole package is CRC Calibration data, etc . transaction It is used to simulate this actual situation , a transaction It's just a bag . In different verification platforms , It will be different transaction.