參數(shù)資料
型號(hào)： busmux
廠商： Altera Corporation
英文描述： Parameterized Multiplexer(參數(shù)確定的多路復(fù)用器)
中文描述： 參數(shù)復(fù)用器（參數(shù)確定的多路復(fù)用器）
文件頁(yè)數(shù)： 22/48頁(yè)
文件大?。?/td> 293K
代理商： BUSMUX
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
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