Altera Mentor Verification IP Altera Edition AMBA AXI3/4T Manual do Utilizador descarregar pdf (Página 217)

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101

VHDL API Overview

Operational Transaction Fields

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

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September 2013

You can configure this behavior to be nonblocking by setting the operation_mode transaction

field to the enumerate type value **_TRANSACTION_NON_BLOCKING instead of the default

**_TRANSACTION_BLOCKING.

For example, in a master BFM test program you create a transaction by calling the

create_read_transaction() or create_write_transaction() tasks which creates a transaction

record. Before executing the transaction record the operation_mode can be changed as follows:

-- * = axi| axi4

-- ** = AXI | AXI4

-- Create a write transaction to create a transaction record

create_write_transaction(1, tr_id, bfm_index, *_tr_if_0(bfm_index));

-- Change operation_mode to be nonblocking in the transaction record

set_operation_mode(**_TRANSACTION_NON_BLOCKING, tr_id, bfm_index,

*_tr_if_0(bfm_index));

In the above example, the bfm_index specifies the BFM.

Channel Handshake Delay

Each of the five protocol channels have *VALID and *READY handshake signals to control the

rate at which information is transferred between a master and slave. The API to control these

handshake signals differs between the AXI3 BFMs and AXI4 BFMs. Refer to the AXI3 BFM

Handshake Delay and AXI3 BFM Delay Mode for details of the AXI3 BFM API, and AXI3

BFM Handshake Delay for details of the AXI4 BFM API.

AXI3 BFM Handshake Delay

The delay between the *VALID and *READY handshake signals for each of the five protocol

channels can be configured. The delay can be defined per phase (beat) basis for a particular

transaction, measured from the positive edge of ACLK when *VALID is asserted. The delay can

also be set from the completion of a previous transaction phase (*VALID and *READY both

asserted).

AXI3 BFM Handshake Signal Delay Transaction Fields

There are transaction fields to configure the desired handshake delay pattern for a particular

transaction phase on any of the five protocol channels. The master BFM configures the *VALID

and *READY signal delays that it asserts, and the slave BFM configures the *VALID and

*READY signal delays that it asserts. Table 7-2 below specifies which operational delay

transaction fields are configured by the master and slave BFMs.

Table 7-2. Handshake Signal Delay Transaction Fields

Signal Operational Transaction Field Configuration BFM

AWVALID address_valid_delay Master

AWREADY address_ready_delay Slave

1 2 ... 212 213 214 215 216 217 218 219 220 221 222 ... 782 783

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