Altera Mentor Verification IP Altera Edition AMBA AXI3/4T Manuel d'utilisateur télécharger pdf (Page 195)

100

101

SystemVerilog Tutorials

Verifying a Master DUT

Mentor VIP AE AXI3/4 User Guide, V10.2b

177

September 2013

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

the variable t.

Example 6-43. 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 burst or a phase (beat),

depending on the slave_mode configuration. 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 with in 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).

If the slave_mode configuration is set to the default of AXI4_TRANSACTION_SLAVE then the

loop continues until the read data has been set for the whole burst. Otherwise the individual 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 AXI3/4T Manuel d'utilisateur Page 195

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