Altera Avalon Verification IP Suite - Manual (Page 140)

1–2 Chapter 1: Nios II Custom Instruction Master BFM
Parameters
Avalon Verification IP Suite User Guide May 2011 Altera Corporation
The Nios II Custom Instruction Master BFM uses queues to manage instructions. 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 result is sampled based on the driven instruction and inserted into a result queue.
You can remove the result on an event basis, or at the end of the simulation.
Parameters
Table 1–1 lists the parameter settings for the custom instruction master BFM interface.
Table 1–1. 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 Port On On/Off When 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 port On On/Off When On, the interface includes a start pin.
Using done port On On/Off When On, the interface includes a done pin.
Use Extended Port Off On/Off When On, the interface includes a n pin.
Extended Port Width 1 — Specifies the width of the extended n port.
Use Internal Register a Off On/Off When On, the interface includes the readra and a pins.
Use Internal Register b Off On/Off When On, the interface includes the readrb and b pins.
Use Internal Register c Off On/Off When On, the interface includes the readrc and c pins.