參數(shù)資料
型號(hào)： lpm-shiftreg
廠商： Altera Corporation
英文描述： Parameteruzed Shift Register(參數(shù)確定的移位寄存器)
中文描述： Parameteruzed移位寄存器（參數(shù)確定的移位寄存器）
文件頁(yè)數(shù)： 11/48頁(yè)
文件大小： 293K
代理商： LPM-SHIFTREG
6
Altera Corporation
Gate Functions
lpm_clshift
Parameterized Combinatorial Logic Shifter
or Barrel Shifter
The
lpm_clshift
function performs
logical, rotational, or arithmetic
combinatorial shifting. The direction and
distance of the shifting are user-
controllable.
Ports
Parameters
Name
Type
Required
Description
data[]
Input
Input
Yes
Yes
Data to be shifted. This port is
LPM_WIDTH
wide.
Number of positions to shift
data[]
in the direction specified by the
direction
port. This port is
LPM_WIDTHDIST
wide.
Direction of shift. Low = left (toward the most significant bit (MSB)), high = right
(toward the least significant bit (LSB)). Default value is 0 (low) = left (toward
the MSB).
Shifted data. This port is
LPM_WIDTH
wide.
Logical or arithmetic underflow. If
"ROTATE"
is specified as the
LPM_SHIFTTYPE
parameter value and
overflow
and
underflow
are
connected, the output of
overflow
and
underflow
will be undefined logic
levels.
Logical or arithmetic overflow. If
"ROTATE"
is specified as the
LPM_SHIFTTYPE
parameter value and
overflow
and
underflow
are
connected, the output of
overflow
and
underflow
will be undefined logic
levels.
distance[]
direction
Input
No
result[]
Output
Output
Yes
No
underflow
overflow
Output
No
Name
Required
Value
Description
LPM_SHIFTTYPE
No
"LOGICAL"
"ROTATE"
"ARITHMETIC"
Integer > 1
Integer > 0
The sign bit is extended for
"ARITHMETIC"
right shifts. For
a
"LOGICAL"
right shift, 0s are always shifted into the
MSB or LSB. The default value is
"LOGICAL"
.
Width of the
data[]
and
result[]
ports.
Width of the
distance[]
port. The
distance[]
port
values normally range from 0, which is “no shift,” to
(
LPM_WIDTH
– 1), which is the maximum meaningful shift.
The typical value assigned to
LPM_WIDTHDIST
is “the
smallest integer not less than log
2
(
LPM_WIDTH
)” or
ceil(log
2
(
LPM_WIDTH
)). Any
distance[]
port value
greater than (
LPM_WIDTH
– 1) results in an undefined logic
level.
LPM_WIDTH
Yes
Yes
LPM_WIDTHDIST
data[]
distance[]
direction
result[]
underflow
overflow
LPM_CLSHIFT
LPM_SHIFTTYPE=
LPM_WIDTH=
LPM_WIDTHDIST=CEIL(LOG2(LPM_WIDTH))
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