Altera Mentor Verification IP Altera Edition AMBA AXI3/4T Manuale Utente Scaricare il pdf (Pagina 631)

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101

VHDL Tutorials

Verifying a Slave DUT

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

611

September 2013

Example 11-4. Write Burst Transaction Creation and Execution

-- Write data burst length of 7 to start address 16.

create_write_transaction(16, 7, tr_id, index, axi_tr_if_0(index));

data_words(31 downto 0) := x"ACE0ACE1";

set_data_words(data_words, 0, tr_id, index, axi_tr_if_0(index));

data_words(31 downto 0) := x"ACE2ACE3";

set_data_words(data_words, 1, tr_id, index, axi_tr_if_0(index));

data_words(31 downto 0) := x"ACE4ACE5";

set_data_words(data_words, 2, tr_id, index, axi_tr_if_0(index));

data_words(31 downto 0) := x"ACE6ACE7";

set_data_words(data_words, 3, tr_id, index, axi_tr_if_0(index));

data_words(31 downto 0) := x"ACE8ACE9";

set_data_words(data_words, 4, tr_id, index, axi_tr_if_0(index));

data_words(31 downto 0) := x"ACEAACEB";

set_data_words(data_words, 5, tr_id, index, axi_tr_if_0(index));

data_words(31 downto 0) := x"ACECACED";

set_data_words(data_words, 6, tr_id, index, axi_tr_if_0(index));

data_words(31 downto 0) := x"ACEEACEF";

set_data_words(data_words, 7, tr_id, index, axi_tr_if_0(index));

for i in 0 to 7 loop

set_write_strobes(15, i, tr_id, index, axi_tr_if_0(index));

end loop;

set_write_data_mode(AXI_DATA_WITH_ADDRESS, tr_id, index,

axi_tr_if_0(index));

execute_transaction(tr_id, index, axi_tr_if_0(index));

In the complete Master Test Program, a subsequent write data burst transaction has lane 0 of the

first data beat of the burst configured to be invalid, by setting the least significant bit of the

write_strobes[0] field to zero by passing in the value of 14. See set_write_strobes() for more

details.

set_write_strobes(14, 0, tr_id, index, axi_tr_if_0(index));

See the VHDL AXI4 Master BFM Test Program code listing for details.

Read Burst Transaction Creation and Execution

The code excerpt in Example 11-5 reads the first two data beats from the data burst that has

been previously written into the slave memory. The call to create_read_transaction() procedure

creates the read burst transaction by providing the start address and burst length arguments. The

actual length of the burst on the protocol signals is 1+1=2.

Note

The burst length argument passed to the create_read_transaction() procedure is 1 less

than the number of transfers (beats) in the burst. This aligns the burst length argument

value with the value placed on the ARLEN protocol signals.

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Altera Mentor Verification IP Altera Edition AMBA AXI3/4T Manuale Utente Pagina 631

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