Altera Avalon Verification IP Suite Manuale Utente Scaricare il pdf (Pagina 157)

• A conduit port can also have a specific role named export. Ports with this role name are exported from

the current system design module to the Conduit BFM module I/O.

The conduit API constructs or deconstructs transactions. Transactions are driven out on the physical conduit

interface.

To simulating conduit interfaces, you must understand the following points:

1. At the beginning of the simulation, registers that store data sent to the output ports are empty.

2. The Conduit BFM drives ‘x’ to the output ports until you rewrite the registers by calling the set_<role

name> API.

3. Initially, bidirectional ports work as input ports. You can change conduit port functionality by calling

the set_<role name>_oe API.

4. The Conduit BFM prints a message when a bidirectional port changes from an input to an output, and

vice versa.

5. Bidirectional ports drive register values to the interface when this API is set to 1. Otherwise, bidirectional

ports work as input ports.

6. You can call the get_<role name> API to obtain the value coming from the input and bidirectional ports.

Parameters

Table 11-1: Conduit BFM Parameter Settings

DescriptionLegal ValuesDefault ValueOption

Specifies the role name of each port.Any stringN/ARole

Specifies the port width.1–10241Width

Specifies the direction of the signal.input, output,

bidir

inputDirection

Conduit BFM API

event_input_<role name>_change

event_input_<role name>_changePrototype:

Verilog HDL: N.A.

VHDL: None

Arguments:

voidReturns:

Notifies the testbench when a port changes its value<role name>. For a bidirec-

tional port, this event is only triggered if its input value defers from its last input

value.

Description:

VHDLLanguage support:

Conduit BFM

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Parameters

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