Altera Mentor Verification IP Altera Edition AMBA AXI3/4T Uživatelský manuál stáhnout pdf (Strana 67)

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101

SystemVerilog AXI3 and AXI4 Master BFMs

execute_transaction()

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

September 2013

execute_transaction()

This task executes a master transaction previously created by the create_write_transaction(), or

create_read_transaction(), functions. The transaction can be blocking (default) or non-

blocking, defined by the transaction record operation_mode field.

The results of execute_transaction() for write transactions varies based on how write transaction

fields are set. If the gen_write_strobes transaction field is set, execute_transaction()

automatically corrects any previously set write_strobes. However, if the gen_write_strobes

field is not set, then any previously assigned write_strobes will be passed through onto the

WSTRB protocol signals, which can result in a protocol violation if not correctly set. Refer to

“Automatic Correction of Byte Lane Strobes” on page 197 for more details.

If a write transaction write_data_mode field is set to *_DATA_WITH_ADDRESS,

execute_transaction() calls the execute_write_addr_phase() and execute_write_data_burst()

tasks simultaneously, otherwise execute_write_data_burst() will be called after

execute_write_addr_phase() so that the write data burst occurs after the write address phase

(default). It will then call the get_write_response_phase() task to complete the write transaction.

For a read transaction, execute_transaction() calls the execute_read_addr_phase() task

followed by the get_read_data_burst() task to complete the read transaction.

AXI3 Example

// Declare a local variable to hold the transaction record.

axi_transaction read_trans;

// Create a read transaction with start address of 0 and assign

// it to the local read_trans variable.

read_trans = bfm.create_read_transaction(0);

....

// Execute the read_trans transaction.

bfm.execute_transaction(read_trans);

Prototype

// * = axi | axi4

task automatic execute_transaction

(

*_transaction trans

);

Arguments trans The *_transaction record.

Returns

None

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