Altera Avalon Verification IP Suite Bedienungsanleitung PDF herunterladen (Seite 149)

2–2 Chapter 2: Nios II Custom Instruction Slave BFM

Parameters

Avalon Verification IP Suite User Guide May 2011 Altera Corporation

The Nios II Custom Instruction Slave BFM does not use queues to manage the

instructions or results. Without queues, the BFM uses events to retrieve the

instructions and to drive results. This method allows greater flexibility in controlling

the output result (for example, driving a result when the interface is unknown). If

there is an instruction and you do not provide the result, the BFM drives the old result

onto the interface. If there is no instruction at all, the BFM drives unknown (X) on the

interface.

Parameters

Table 2–1 lists the parameter settings for the custom instruction master BFM interface.

Table 2–1. Custom Instruction Master BFM Parameter Settings

Option

Default

Value

Legal

Values

Description

General

Number of Operands to Use 2 0,1,2

Specifies the number of operands to use.

0: no operands are used.

1: use dataa port only.

2: use dataa and datab ports.

Fixed Length for Multi-cycle

Mode

2—Specifies the fixed length for multi-cycle mode.

Port Enables

Use Result PortOnOn/OffWhen On, the interface includes a

result

pin.

Use Multi-cycle Mode Off On/Off

When On, the interface can include a

start

pin, a

done

pin,

both pins, or neither pins. The result returns in any of the

following conditions:

■ With a

start

signal—Result returns together with an

instruction.

■ Without a

start

signal—Result returns with instruction on

the bus at every clock cycle.

■ With a

done

signal—Result returns at any time.

■ Without a

done

signal—Result returns at a fixed cycle.

Using start portOnOn/OffWhen On, the interface includes a

start

pin.

Using done portOnOn/OffWhen On, the interface includes a

done

pin.

Use Extended Port Off On/Off When On, the interface includes a

pin.

Extended Port Width 1 — Specifies the width of the extended

port.

Use Internal Register a Off On/Off When On, the interface includes the

readra

and

pins.

Use Internal Register b Off On/Off When On, the interface includes the

readrb

and

pins.

Use Internal Register c Off On/Off When On, the interface includes the

readrc

and

pins.

1 2 ... 144 145 146 147 148 149 150 151 152 153 154 ... 177 178

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