Altera Mentor Verification IP Altera Edition AMBA AXI3/4T Uživatelský manuál stáhnout pdf (Strana 183)

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101

SystemVerilog Tutorials

Verifying a Master DUT

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

165

September 2013

The Slave BFM helper function set_read_data() then fills a complete read data bus width of

data into the Slave BFM data_words[] array. At this point a read data phase is executed on to

the read data channel if the slave_mode setting is AXI_PHASE_SLAVE, otherwise it executes a

complete read data burst only when the Slave BFM data_words[] array contains a complete

burst of read data.

Example 6-29. handle_read

// Task : handle_read

// This method reads data from memory and send read data/response

// either at burst or phase level depending upon slave working

// mode.

task automatic handle_read(input axi_transaction read_trans);

addr_t addr[];

bit [7:0] mem_data[];

set_read_data_valid_delay(read_trans);

for(int i = 0; bfm.get_read_addr(read_trans, i, addr); i++)

begin

mem_data = new[addr.size()];

for (int j = 0; j < addr.size(); j++)

mem_data[j] = do_byte_read(addr[j]);

bfm.set_read_data(read_trans, i, addr, mem_data);

if (slave_mode == AXI_PHASE_SLAVE)

bfm.execute_read_data_phase(read_trans, i);

end

if (slave_mode == AXI_TRANSACTION_SLAVE)

bfm.execute_read_data_burst(read_trans);

endtask

The processing of write transactions in the Slave Test Program works in a similar way as that

described for read transactions. Processing a write transaction requires both a process_write

task and a handle_write task.

The main difference is that the write transaction handling gets the write data burst and stores it

in the Slave Test Program internal memory depending on the slave_mode setting, adhering to

the state of the write strobes signal WSTRB. There is also an additional write response phase that

is required for the AXI3 write channel.

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