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參數(shù)資料
| 型號： | lpm-constant |
| 廠商： | Altera Corporation |
| 英文描述： | Parameterized Constant Generator(參數(shù)確定的常量發(fā)生器) |
| 中文描述： | 參數(shù)化常數(shù)發(fā)生器（參數(shù)確定的常量發(fā)生器） |
| 文件頁數(shù)： | 22/48頁 |
| 文件大?。?/td> | 293K |
| 代理商： | LPM-CONSTANT |
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Altera Corporation
17
Arithmetic Functions
lpm_add_sub
Parameterized Adder/ Subtractor
Ports
Name
Type
Required
Description
add_sub
Input
No
If the input is high, the operation =
dataa[]
+
datab[]
. If the input is low,
the operation =
dataa[]
–
datab[]
. This port cannot be used if the
LPM_DIRECTION
parameter is used. If both the
add_sub
port and the
LPM_DIRECTION
parameter are omitted, the operation defaults to
"ADD"
.
Carry-in to the low-order bit. If the operation is
"ADD"
, Low = 0 and High = +1.
If the operation is
"SUB"
, Low = –1 and High = 0. If omitted, the default is 0
(i.e., no affect on
"ADD"
or
"SUB"
operations).
Augend/Minuend. This port is
LPM_WIDTH
wide.
Clock for pipelined usage. The
clock
port provides pipelined operation of
lpm_add_sub
. For
LPM_PIPELINE
values other than 0 (default value), the
clock
port must be connected.
Addend/Subtrahend. This port is
LPM_WIDTH
wide.
Asynchronous clear for pipelined usage. The pipeline initializes to undefined.
The
aclr
port can be used at any time to reset the pipeline to all 0s,
asynchronously to
clock
.
dataa[]
+ or –
datab[]
+ or –
cin
. This port is
LPM_WIDTH
wide.
Result exceeds available precision. If
overflow
is used,
cout
cannot be
used. The
overflow
signal has a physical interpretation as the
XOR
of the
carry into the MSB with the carry out of the MSB. The
overflow
signal is only
meaningful when the
LPM_REPRESENTATION
parameter is set to
"SIGNED"
.
Note (1)
Carry-out (borrow-in) of the MSB. If
overflow
is used,
cout
cannot be used.
The
cout
signal has a physical interpretation as the carry-out (borrow-in)
of the MSB and is most meaningful for detecting overflow in
"UNSIGNED"
operations.
Note (2)
cin
Input
No
dataa[]
Input
Input
Yes
No
clock
datab[]
Input
Input
Yes
No
aclr
result[]
Output
Output
Yes
No
overflow
cout
Output
No
cin
result[]
dataa[]
clock
datab[]
cout
LPM_ADD_SUB
LPM_DIRECTION=
LPM_PIPELINE=
LPM_REPRESENTATION=
LPM_WIDTH=
ONE_INPUT_IS_CONSTANT=
add_sub
overflow
aclr
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| lpm-decode | Parameterized Decoder(參數(shù)確定的解碼器) |
| lpm-counter | Parameteruzed Absolute Value(參數(shù)確定的計數(shù)器) |
| lpm-compare | Parameteruzed Comparator(參數(shù)確定的比較器) |
| lpm-latch | Parameteruzed Latch(參數(shù)確定的鎖存器) |
| lpm-bustri | Parameterized Tri-State Buffer(參數(shù)確定的三態(tài)緩沖器) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LPMM-S2 | 制造商:Panduit Corp 功能描述: 制造商: 功能描述: 制造商:undefined 功能描述: |
| LPMM-S2-C | 功能描述:電纜束帶 LOW PROFILE MOUNT RoHS:否 制造商:Phoenix Contact 產(chǎn)品:Cable Tie Mounts 類型:Adhesive 顏色:Black 材料:Acrylonitrile Butadiene Styrene (ABS) 長度:19 mm 寬度:19 mm 抗拉強度: |
| LPMM-S2-M | 功能描述:電纜束帶 Cable Tie Mount, Low Profile, #2 Screw RoHS:否 制造商:Phoenix Contact 產(chǎn)品:Cable Tie Mounts 類型:Adhesive 顏色:Black 材料:Acrylonitrile Butadiene Styrene (ABS) 長度:19 mm 寬度:19 mm 抗拉強度: |
| LPMM-S5 | 制造商:MISCELLANEOUS 功能描述: |
| LPMM-S5-C | 功能描述:電纜束帶 LOW PROFILE MOUNT RoHS:否 制造商:Phoenix Contact 產(chǎn)品:Cable Tie Mounts 類型:Adhesive 顏色:Black 材料:Acrylonitrile Butadiene Styrene (ABS) 長度:19 mm 寬度:19 mm 抗拉強度: |
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