BarrelShifter
BarrelShifter
Also called: Logic Shifter, Combinational Logic Shifter.
FunctionRotates the input a specified number of bits in a specified direction. Notation"SHFT" = Rotate input by a number of bits in the specified direction. CommentsMinimize MAX_SHIFT to conserve resources and maximize speed. |
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Parameters
|
Name |
Description |
|
WIDTH |
Width of the D, Y and Q ports. |
|
MAX_SHIFT |
Maximum number of bits to shift (Minimize to conserve resources). |
|
MAX_SHIFT_BITS |
The Width of Bits2Shift, also the number of bits in MAX_SHIFT. |
Tagged Values
|
Name |
Variants |
|
Registered |
No, Yes |
|
Direction |
Left, Right, Both |
|
Enable |
UnUsed, Used |
Inputs
|
Name |
Width |
Condition |
Description |
|
D |
WIDTH |
None |
Data to be shifted. |
|
Bits2Shift |
MAX_SHIFT_BITS |
None |
Number of bits to shift. |
|
Enable |
|
Registered = No |
if(Enable) Y = D SHFT Bits2Shift; else Y=D |
|
ClockEn |
|
Registered = Yes |
if (ClockEn) Q = D SHFT Bits2Shift |
|
ShiftLeft |
|
Direction = Both |
if(ShiftLeft) SHFT = Left; else SHFT = Right |
Outputs
|
Name |
Width |
Condition |
Description |
|
Y |
WIDTH |
Registered = No |
D ROL Bits2Shift |
|
Q |
WIDTH |
Registered = Yes |
D ROL Bits2Shift |