參數(shù)資料
型號(hào)： lpm-clshift
廠(chǎng)商： Altera Corporation
英文描述： Parameterized Combinatorial Logic Shifter or Barrel Shifter(參數(shù)確定的組合邏輯移位器或柱式移位器)
中文描述： 參數(shù)化組合邏輯移位或桶式移位器（參數(shù)確定的組合邏輯移位器或柱式移位器）
文件頁(yè)數(shù)： 43/48頁(yè)
文件大?。?/td> 293K
代理商： LPM-CLSHIFT
38
Altera Corporation
Custom Parameterized Functions
csfifo
Cycle-Shared FIFO
The
csfifo
function is a custom function
that provides a cycle-shared FIFO with both
dynamic and static user threshold level
controls. It also offers empty and full flag
outputs.
Ports
Parameters
Name
Type
Required
Description
data[]
Input
Input
Input
Input
Input
Input
Input
Output
Output
Yes
Yes
Yes
Yes
Yes
No
No
Yes
Data input to the
csfifo
. This port is
LPM_WIDTH
wide.
Write request.
Read request.
Positive-edge-triggered clock.
Positive-edge-triggered clock.
Resets
csfifo
to empty.
Level (number of words) that the
threshold
output signal asserts.
Data output from
csfifo
. This port is
LPM_WIDTH
wide.
wreq
rreq
clock
clockx2
clr
threshlevel[]
q[]
threshold
No
Indicates that
csfifo
contains greater than the
threshlevel[]
number of
words.
Indicates that
csfifo
is empty.
empty
Output
Output
No
full
No
Indicates that
csfifo
is full.
Name
Required
Value
Description
LPM_NUMWORDS
No
Integer > 0
Number of words stored in memory. In general, this value
should be (but is not required to be):
2
LPM_WIDTH
– 1
<
LPM_NUMWORDS
≤
2
LPM_WIDTHAD
. The default
value is 2
LPM_WIDTH
.
Width of the
data[]
and
q[]
ports. The default value is 8.
LPM_WIDTH
Yes
Integer > 0
CSFIFO
data[]
wreq
rreq
clock
clockx2
clr
threshlevel[]
LPM_NUMWORDS=
LPM_WIDTH=8
q[]
threshold
empty
full
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