Process_read, Task loops forever, processing read, Task can begin – Altera Mentor Verification IP Altera Edition AMBA AXI3/4TM User Manual
Page 182
Mentor VIP AE AXI3/4 User Guide, V10.2b
164
SystemVerilog Tutorials
Verifying a Master DUT
September 2013
Example 6-27. 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
axi_transaction read_trans;
read_trans = bfm.create_slave_transaction();
set_read_address_ready_delay(read_trans);
bfm.get_read_addr_phase(read_trans);
fork
begin
automatic axi_transaction t = read_trans;
handle_read(t);
end
join_none
#0;
end
endtask
function calls the set_data_valid_delay() function in the Slave
BFM. It configures the delay for the assertion of ARVALID signal for each read data phase
(beat) of a read burst.
Example 6-28. set_read_data_ready()
// Function : set_read_data_valid_delay
// This is used to set read response phase valid delays to start
// driving read data/response phases after specified delay.
function void set_read_data_valid_delay(axi_transaction trans);
for (int i = 0; i < trans.data_valid_delay.size(); i++)
trans.set_data_valid_delay(i, i);
endfunction
task gets the data from the
depending on the
configuration. It's 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
configures the assertion of the ARVALID signal delay.
The task then loops for the number of addresses defined by calling the
helper
function in the Slave BFM, assigning the local mem_data variable with read data by calling the
function.