Altera Mentor Verification IP Altera Edition AMBA AXI4-Li Bedienungsanleitung PDF herunterladen (Seite 132)

Mentor Verification IP AE AXI4-Lite User Guide, V10.3

132

SystemVerilog Tutorials

Verifying a Master DUT

April 2014

In the fork-join_none block, the read_trans record is passed into the handle_read() function via

the variable t.

Example 6-18. process_read()

// Task : process_read

// This method keep receiving read address phase and calls another

// method to process received transaction.

task process_read;

forever

begin

axi4_transaction read_trans;

read_trans = bfm.create_slave_transaction();

bfm.get_read_addr_phase(read_trans);

fork

begin

automatic axi4_transaction t = read_trans;

handle_read(t);

end

join_none

#0;

end

endtask

handle_read()

The handle_read() task gets the data from the Internal Memory as a a phase (beat). The

read_trans argument contains the record of the read transaction up to the point of this task call,

namely the content of the read address phase.

The call to set_read_data_valid_delay() configures the RVALID signal delay for each phase

(beat).

In a loop, the call to the get_read_addr() helper function returns the actual address addr for a

particular byte location. This byte address is used to read the data byte from Internal Memory

with the call to the do_byte_read() function, assigning the local mem_data variable with read

data do_byte_read(). The call to the set_read_data() helper function sets the byte within the

read transaction record. The loop continues reading and setting the read data from internal

memory for the whole of the read data phase (beat).

The read data phase is executed over the protocol signals by calling the

execute_read_data_phase().

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Altera Mentor Verification IP Altera Edition AMBA AXI4-Li Bedienungsanleitung Seite 132