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參數(shù)資料
| 型號(hào)： | lpm-bustri |
| 廠商： | Altera Corporation |
| 英文描述： | Parameterized Tri-State Buffer(參數(shù)確定的三態(tài)緩沖器) |
| 中文描述： | 參數(shù)化三態(tài)緩沖器（參數(shù)確定的三態(tài)緩沖器） |
| 文件頁數(shù)： | 23/48頁 |
| 文件大?。?/td> | 293K |
| 代理商： | LPM-BUSTRI |
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18
Altera Corporation
Arithmetic Functions
Parameters
Notes:
(1)
The following table describes the
overflow
port during
"ADD"
and
"SUB"
operations.
(2)
The following table describes the
cout
port during
"ADD"
and
"SUB"
operations.
Name
Required
Value
Description
LPM_DIRECTION
No
"ADD"
"SUB"
"DEFAULT"
The
add_sub
port cannot be used if the
LPM_DIRECTION
parameter is has a value other than
"DEFAULT"
. The default
value is
"DEFAULT"
.
LPM_PIPELINE
No
Integer
≥
0
Specifies the number of clock cycles of latency associated with
the
result[]
output. A value of zero (
0
) indicates that no
latency exists, and that a purely combinatorial function will be
instantiated. The default value is 0 (non-pipelined).
Type of addition performed. The default value is
"SIGNED"
.
LPM_REPRESENTATION
No
"SIGNED"
"UNSIGNED"
Integer > 0
LPM_WIDTH
Yes
No
Width of the
dataa[]
,
datab[]
, and
result[]
ports.
Provides greater optimization if an input is constant. The
default value is
"NO"
.
ONE_INPUT_IS_CONSTANT
"YES"
"NO"
Value
ADD Operation
SUB Operation
"UNSIGNED"
Not meaningful.
(
dataa
+
datab
+
cin
) > 2
(
LPM_WIDTH
– 1) – 1
or
(
dataa
+
datab
+
cin
) > 2
(
LPM_WIDTH
– 1)
Not meaningful.
(
dataa
–
datab
–
cin
) > 2
(
LPM_WIDTH
– 1) – 1
or
(
dataa
–
datab
–
cin
) > 2
(
LPM_WIDTH
– 1)
"SIGNED"
Value
ADD Operation
SUB Operation
"UNSIGNED"
dataa
+
datab
+
cin
> 2
(
LPM_WIDTH
– 1) – 1
Normal subtract. However, if
cout
= 0, then
(
dataa
–
datab
–
cin
) < 0.
Normal result when subtracting a positive
number from a negative number, or possible
overflow.
"SIGNED"
Normal result of adding two negative numbers,
or possible overflow.
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