Altera Avalon Verification IP Suite Uživatelský manuál stáhnout pdf (Strana 128)

2–2 Chapter 2: Tri-State Conduit BFM

Parameters

Avalon Verification IP Suite User Guide May 2011 Altera Corporation

An Avalon-TC interface can have an arbitrary number of ports. Each port has an

associated role name. This role name is an arbitrary string. The difference between

conduit interfaces and Avalon-TC interface is the way in which bidirectional ports are

handled. In Avalon-TC interfaces, a bidirectional port is decomposed into three

distinct unidirectional port signals with role names having the following suffixes:

■

<role name>_in

■

<role name>_out

■

<role name>_outen

The set of bidirectional ports in the Avalon-TC interface are grouped together. The

Avalon-TC interface also includes the

request

port, the

grant

port, and an associated

clock. These

request

and

grant

signals are the control signals to and from the arbiter

that controls access to the shared media.

The following port combinations are not legal:

■ In and out roles (without a

outen

role)

■ In and outen roles (without a

out

role)

■ Only an outen role (without a

<role name>_out

role)

Parameters

The Tri-State Conduit BFM supports signals that interface to multiple external

memory devices.

1 For more information about the Avalon-TC interface supported in Qsys, refer to the

Avalon Interface Specifications (version 2.0).

Table 2–1 lists the parameter settings for the Tri-State Conduit BFM.

Table 2–1. Tri-State Conduit BFM Parameter Settings

Option Default Value Legal Values Description

Role — Any string Specifies the role name of each port.

Width 1 1–1024 Specifies the port width.

USE_INPUT 1 0 or 1 Specifies an input port.

USE_OUTPUT 1 0 or 1 Specifies an output port.

USE_OUTPUTENABLE 1 0 or 1 Specifies an output enable port.

MAX_MULTIPLE_TRANSACTION 1024 —

Specifies the maximum transactions of data

while request and grant signals are asserted.

The value is constraint by the number of roles.

1 2 ... 123 124 125 126 127 128 129 130 131 132 133 ... 177 178

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