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15–2
Chapter 15: Arithmetic Library
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 15–1 shows the Barrel Shifter block inputs and outputs.
Table 15–1. Barrel Shifter Block Inputs and Outputs
Signal
a
distance
direction
ena
aclr
r
Direction
Input
Input
Input
Input
Input
Output
Description
Data input.
Distance to shift.
Direction to shift (0 = shift left, 1 = shift right).
Optional clock enable.
Optional asynchronous clear.
Result after shift.
Table 15–2 shows the Barrel Shifter block parameters.
Table 15–2. Barrel Shifter Parameters
Name
Bus Type
Value
Signed Integer,
Signed Fractional,
Unsigned Integer
Description
The bus number format that you want to use.
[number of bits].[]
>= 0 (Parameterizable) Specify the number of bits to the left of the binary point.
[].[number of bits]
Enable Pipeline
Infer size of distance
port from input port
Bit width of distance
port
>= 0 (Parameterizable)
On or Off
On or Off
>= 0 (Parameterizable)
Specify the number of bits to the right of the binary point.
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 MAX of your design.
Turn off to specify the bit width of the distance port. When on, the design
uses the full input bus width.
Specify the width in bits of the distance port. Defaults to the size of the
input port.
Shift Direction
Shift Left, Shift Right, The direction you want to shift the bits or specify the direction with the
Use direction input pin direction input.
Use Enable Port
Use asynchronous
Clear Port
On or Off
On or Off
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.
Use Dedicated Circuitry On or Off
DSP Builder Handbook
Volume 2: DSP Builder Standard Blockset
If you target devices that support DSP blocks, turn on to implement the
functionality in DSP blocks instead of logic elements.
November 2013 Altera Corporation
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