Altera Mentor Verification IP Altera Edition AMBA AXI4-St Bedienungsanleitung PDF herunterladen (Seite 187)

VHDL Tutorials

Verifying a Master DUT

Mentor Verification IP AE AMBA AXI4-Stream User Guide, V10.3

187

April 2014

Note

In addition to the above procedures and variables, you can configure other aspects of the

slave BFM by using these procedures: set_config() and get_config().

Advanced Slave Test Program API Definition

The remaining section of this tutorial presents a walk-through of the Advanced Slave Test

Program API within the slave BFM test program. It consists of a single initial block() process

that receives protocol transfers, inserting a delay in the assertion of the TREADY signal as

detailed in the Basic Slave Test Program API Definition.

initial block()

Within a process, the slave test program defines a local variable trans to hold the Transaction

Record of the transaction, as shown in Example 11-6. The initial wait for the ARESETn signal

to be deactivated, followed by a positive ACLK edge, satisfies the protocol requirement detailed

in Section 2.7.2 of the AMBA 4 AXI4-Stream Protocol Specification.

Example 11-6. Initialization

--/////////////////////////////////////////////////////////////////////

-- Code user do not need to edit

--/////////////////////////////////////////////////////////////////////

process

variable trans: integer;

variable i : integer;

variable last : integer;

begin

--*******************

--** Initialisation **

--********************

wait_on(AXI4STREAM_RESET_POSEDGE, index, axi4stream_tr_if_0(index));

wait_on(AXI4STREAM_CLOCK_POSEDGE, index, axi4stream_tr_if_0(index));

To receive protocol transfers, you must create a slave transaction. Within a loop, the

create_slave_transaction() procedure is called to create a slave transaction, returning the

transaction_id field of the transaction via the trans variable, as shown in Example 11-7.

An inner while loop iterates until the last transfer has been received. On each iteration, a delay is

inserted before the TREADY signal is set to 1 by calling the ready_delay() procedure if

m_insert_wait is set to 1. After any TREADY delay, the blocking get_transfer() procedure is

called and waits for a transfer to be received.

If further analysis of the received transfer is required, then you need to edit the Advanced Slave

API to achieve this. You can obtain details of the Transaction Record for the received transfer

using the get*() procedures within the VHDL Slave BFM.

1 2 ... 182 183 184 185 186 187 188 189 190 191 192 ... 230 231

Keine Kommentare

Altera Mentor Verification IP Altera Edition AMBA AXI4-St Bedienungsanleitung Seite 187