IPT-DSPBUILDER Altera, IPT-DSPBUILDER Datasheet - Page 210

• Manufacturer Part Number: IPT-DSPBUILDER
• Description: DSP BUILDER SOFTWARE
• Manufacturer: Altera
• Type: DSPr

Specifications of IPT-DSPBUILDER

• Function: DSP Builder
• License: Initial License
• Software Application: IP CORE, DSP BUILDER
• Core Architecture: FPGA
• Core Sub-architecture: Arria, Cyclone, Stratix
• Supported Families: Arria GX, Arria II GX, Cyclone, Stratix
• Rohs Compliant: NA
• Lead Free Status / RoHS Status: Not applicable / Not applicable

2–2
Barrel Shifter
Table 2–2. Barrel Shifter Parameters
DSP Builder Standard Blockset Libraries
Bus Type
[number of bits].[]
[].[number of bits]
Enable Pipeline
Infer size of distance
port from input port
Bit width of distance
port
Shift Direction
Use Enable Port
Use asynchronous
Clear Port
Use Dedicated Circuitry On or Off
Name
The Barrel Shifter block shifts the input data a by the amount set by the
distance bus. The Barrel Shifter block can shift data to the left (toward the
MSB) or to the right (toward the LSB).
The Barrel Shifter block shift data to the left only, or to the right only, or in the
direction specified by the optional direction input. The shifting operation is an
arithmetic shift and not a logical shift; that is, the shifting operation preserves the
input data sign for a right shift although the input sign is lost for a left shift.
Table 2–1
Table 2–1. Barrel Shifter Block Inputs and Outputs
Table 2–2
a
distance
direction
ena
aclr
r
Signed Integer,
Signed Fractional,
Unsigned Integer
>= 0 (Parameterizable) Specify the number of bits to the left of the binary point.
>= 0 (Parameterizable) Specify the number of bits to the right of the binary point.
On or Off
On or Off
>= 0 (Parameterizable) Specify the width in bits of the distance port. Defaults to the size of the
Shift Left, Shift Right,
Use direction input pin
On or Off
On or Off
Signal
Value
shows the Barrel Shifter block inputs and outputs.
shows the Barrel Shifter block parameters.
Input
Input
Input
Input
Input
Output
Direction
The bus number format that you want to use.
This field is zero (0) unless Signed Fractional is selected.
Turn on to pipeline the barrel shifter with a latency of 3. Enabling
pipeline, increases latency and may increase the f
Turn off to specify the bit width of the distance port. When on, the design
uses the full input bus width.
input port.
The direction you want to shift the bits or specify the direction with the
direction input.
Turn on to use the clock enable input (ena).
Turn on to enable the asynchronous clear input. This option is available
only when the pipeline option is enabled.
If you target devices that support DSP blocks, turn on to implement the
functionality in DSP blocks instead of logic elements.
Preliminary
Data input.
Distance to shift.
Direction to shift (0 = shift left, 1 = shift right).
Optional clock enable.
Optional asynchronous clear.
Result after shift.
Description
Description
© June 2010 Altera Corporation
Chapter 2: Arithmetic Library
MAX
of your design.
Barrel Shifter