Parameters, Parameters -2 – Altera Avalon Verification IP Suite User Manual
Page 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
Description
Legal Values
Default
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
0,1,2
2
Number of Operands to Use
Specifies the fixed length for multi-cycle mode.
N/A
2
Fixed Length for Multi-cycle
Mode
Port Enables
When On, the interface includes a
result
pin.
On/Off
On
Use 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/Off
Off
Use Multi-cycle Mode
When On, the interface includes a
start
pin.
On/Off
On
Using start port
When On, the interface includes a
done
pin.
On/Off
On
Using done port
When On, the interface includes a
n
pin.
On/Off
Off
Use Extended Port
Specifies the width of the extended
n
port.
N/A
1
Extended Port Width
When On, the interface includes the
readra
and
a
pins.
On/Off
Off
Use Internal Register a
Nios II Custom Instruction Master BFM
Altera Corporation
Parameters
14-2