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參數(shù)資料
| 型號(hào)： | fp_add_sub |
| 廠商： | Altera Corporation |
| 英文描述： | Floating-Point Adder/Subtractor(浮點(diǎn)型加法器/減法器) |
| 中文描述： | 浮點(diǎn)加法器/減法（浮點(diǎn)型加法器/減法器） |
| 文件頁(yè)數(shù)： | 2/8頁(yè) |
| 文件大小： | 132K |
| 代理商： | FP_ADD_SUB |
2
Altera Corporation
FS 2: fp_add_sub Floating-Point Adder/Subtractor
Parameters
Parameters for the
fp_add_sub
function are provided in
Table 1
.
Ports
Input and output ports for the
Table 2
.
fp_add_sub
function are described in
Functional
Description
Addition and subtraction are complex operations for floating-point
numbers. With floating-point multiplication and division, the mantissa
must be post-normalized. With floating-point addition and subtraction,
however, the mantissas must be preprocessed so that the exponents are
equal. For more information, go to
“Floating-Point Addition &
Subtraction” on page 4
of this functional specification.
In floating-point functions, the sign bit represents the sign of the mantissa:
1 for positive and 0 for negative. The mantissa is a positive number less
than 1. A 0 is implied to the left of the binary point. After normalization,
the most significant bit (MSB) is always 1. The exponent is in excess 2
(
n
-1)
notation, where
n
is the number of bits in the exponent.
Table 1. fp_add_sub Parameters
Name
Default
Value
Description
exponent_width
7
8
Integers only
Integers only
Width of all exponents (in bits)
Width of all mantissas (in bits)
mantissa_width
Table 2. Input & Output Ports
Port Type
Name
Description
Input
Input
Input
Input
Input
Input
Input
Output
Output
Output
sa
Sign bit for the
Mantissa for the
Exponent for the
Sign bit for the
Mantissa for the
Exponent for the
Operation: 1 = add, 0 = subtract
Mantissa for the output
Exponent for the output
Sign bit for the output: 1 = positive, 0 = negative
a
input: 1 = positive, 0 = negative
input
input
input: 1 = positive, 0 = negative
input
input
ma[mantissa_width..1]
a
ea[exponent_width..1]
a
sb
b
mb[mantissa_width..1]
b
eb[exponent_width..1]
b
add_sub
m_out[mantissa_width..1]
e_out[exponent_width..1]
s_out
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