Altera Avalon Verification IP Suite Manual do Utilizador descarregar pdf (Página 177)

The Nios II Custom Instruction Master BFM uses queues to manage instructions. You can use this BFM to

manage instructions in the following ways:

• You can create instructions and push them into the instruction queue. The BFM then removes the

instructions out one-by-one and drives them on the interface.

• You can insert the instructions simultaneously at the beginning of the simulation.

• If there is no instruction to execute, the BFM drives unknown (X), except on the readra, readrb, and

writerc control ports which are driven high.

• The results are inserted into a result queue. You can remove the result on an event basis, or at the end of

the simulation.

Parameters

Table 14-1: Custom Instruction Master BFM Parameter Settings

DescriptionLegal ValuesDefault

Value

Option

General

Specifies the number of operands to use.

• 0: no operands are used

• 1: use dataa port only

• 2: use dataa and datab ports

0,1,22Number of Operands to Use

Specifies the fixed length for multi-cycle mode.N/A2Fixed Length for Multi-cycle

Mode

Port Enables

When On, the interface includes a result pin.On/OffOnUse Result Port

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.

On/OffOffUse Multi-cycle Mode

When On, the interface includes a start pin.On/OffOnUsing start port

When On, the interface includes a done pin.On/OffOnUsing done port

When On, the interface includes a n pin.On/OffOffUse Extended Port

Specifies the width of the extended n port.N/A1Extended Port Width

When On, the interface includes the readra and a pins.On/OffOffUse Internal Register a

Nios II Custom Instruction Master BFM

Altera Corporation

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Parameters

14-2

1 2 ... 172 173 174 175 176 177 178 179 180 181 182 ... 223 224

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