Altera Mentor Verification IP Altera Edition AMBA AXI4-Li Manual de usuario Pagina 120

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Mentor Verification IP AE AXI4-Lite User Guide, V10.3
120
SystemVerilog Tutorials
Verifying a Slave DUT
April 2014
Example 6-5. Create and Execute Write Transactions
/************************
** Traffic generation: **
************************/
// 4 x Writes
// Write data value 1 on byte lanes 1 to address 1.
trans = bfm.create_write_transaction(1);
trans.set_data_words(32'h0000_0100);
trans.set_write_strobes(4'b0010);
$display ( "@ %t, master_test_program: Writing data (1) to address (1)",
$time);
// By default it will run in Blocking mode
bfm.execute_transaction(trans);
In the master test program, three subsequent write transactions are created and executed in a
similar manner to Example 6-5. See the “SystemVerilog AXI4-Lite Master BFM Test
Program” on page 385 for details.
Create and Execute Read Transactions
The code excerpt in Example 6-6 reads the data that has been previously written into the slave
memory. The master test program first creates a read transaction trans by calling the
create_read_transaction() function, providing only the start address argument.
The read data is obtained by calling the get_data_words function to get the data_words
transaction field value. The result of the read data is compared with the expected data, and a
message displays the transcript.
Example 6-6. Create and Execute Read Transactions
// Read data from address 1.
trans = bfm.create_read_transaction(1);
bfm.execute_transaction(trans);
if (trans.get_data_words == 32'h0000_0100)
$display ( "@ %t, master_test_program: Read correct data (1) at
address (1)", $time);
else
$display ( "@ %t master_test_program: Error: Expected data (1) at
address 1, but got %d", $time, trans.get_data_words);
In the master test program, three subsequent read transactions are created and executed in a
similar manner to Example 6-6. “SystemVerilog AXI4-Lite Master BFM Test Program” on
page 385 listing for details.
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