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Port Name Required Description
overflow Yes Overflow exception port. Asserted when the result of the addition or
subtraction, after rounding, exceeds or reaches infinity. Infinity is
defined as a number in which the exponent exceeds 2
WIDTH_EXP
-1.
result[] Yes Floating-point output result. Like the input values, the MSB is the sign,
the next MSBs are the exponent, and the LSBs are the mantissa. The size
of this port is the total width of the sign bit, exponent bits, and mantissa
bits.
underflow Yes Underflow port for the adder or subtractor. Asserted when the result of
the addition or subtraction, after rounding, the value is zero and the
inputs are not equal. The underflow port is also asserted when the
result is a denormalized number.
zero No Zero port for the adder or subtractor. Asserted when the result[] port
is zero.
ALTFP_ADD_SUB Parameters
Table 5-6: ALTFP_ADD_SUB Parameters
Parameter Name Type Required Description
DIRECTION String Yes Specifies addition or subtraction operations. Values
are ADD, SUB, or VARIABLE. If this parameter is not
specified, the default is ADD. When the value is
VARIABLE, the add_sub port determines whether the
operation is addition or subtraction. The add_sub
port must be connected if the DIRECTION parameter
is set to VARIABLE. If the value is ADD or SUB, the add_
sub port is ignored.
PIPELINE Integer No Specifies the latency in clock cycles used in the
ALTFP_ADD_SUB IP core. The PIPELINE
parameter supports values of 7 through 14. If this
parameter is not specified, the default value is 11. In
general, a higher pipeline value produces better f
MAX
performance.
ROUNDING String Yes Specifies the rounding mode. The default value is
TO_NEAREST. Other rounding modes are currently
not supported.
OPTIMIZE String No Defines the design preference, whether the design is
optimized for speed (faster f
MAX
), or optimized for
area (lower resource count). Values are SPEED and
AREA. If this parameter is not specified, the default is
SPEED.
5-6
ALTFP_ADD_SUB Parameters
UG-01058
2014.12.19
Altera Corporation
ALTFP_ADD_SUB IP Core
Send Feedback
- 101 Innovation Drive 1
- San Jose, CA 95134 1
- Contents 2
- About Floating-Point IP Cores 7
- Design Flow 8
- Using the Parameter Editor 10
- File Name Description 12
- Upgrading IP Cores 15
- Related Information 18
- Floating-Point Formats 19
- Special Case Numbers 20
- Non-IEEE-754 Standard Format 21
- Integer bits 22
- Fraction bits 22
- VHDL Component Declaration 24
- VHDL LIBRARY-USE Declaration 24
- ALTERA_FP_MATRIX_INV IP Core 25
- Triangular Matrix Inversion 29
- Matrix Multiplication 29
- Matrix Inversion Operation 29
- Precision Format Numbers 30
- Sample Matrix Data 32
- Matrix Data 33
- ALTERA_FP_MATRIX_INV Signals 34
- ALTERA_FP_MATRIX_MULT IP Core 36
- . . . N-10 . . 38
- . . . N-10 38
- ALTERA_FP_MATRIX_MULT 39
- Parameter Value Description 40
- ALTERA_FP_ACC_CUSTOM IP Core 42
- ALTERA_FP_ACC_CUSTOM Signals 44
- ALTFP_ADD_SUB IP Core 48
- ALTFP_ADD_SUB Signals 51
- ALTFP_ADD_SUB 52
- ALTFP_ADD_SUB Parameters 53
- ALTFP_DIV IP Core 55
- ALTFP_DIV Truth Table 56
- ALTFP_DIV Signals 60
- ALTFP_DIV Parameters 61
- ALTFP_MULT IP Core 63
- Parameters 66
- ALTFP_MULT Signals 67
- ALTFP_SQRT 69
- ALTFP_SQRT Truth Table 70
- ALTFP_SQRT Signals 72
- ALTFP_SQRT Parameters 74
- ALTFP_EXP IP Core 75
- ALTFP_EXP Signals 78
- ALTFP_EXP 79
- ALTFP_EXP Parameters 80
- ALTFP_INV IP Core 81
- ALTFP_INV_SQRT IP Core 87
- ALTFP_INV_SQRT 90
- ALTFP_LOG 93
- ALTFP_ATAN IP Core 99
- ALTFP_ATAN Parameters 100
- Parameter 101
- Type Required Description 101
- ALTFP_SINCOS IP Core 102
- ALTFP_SINCOS Signals 103
- ALTFP_SINCOS Parameters 104
- ALTFP_ABS IP Core 105
- UG-01058 106
- 2014.12.19 106
- ALTFP_ABS Signals 107
- ALTFP_ABS 108
- ALTFP_ABS Parameters 109
- ALTFP_COMPARE IP Core 111
- Format Numbers 112
- ALTFP_COMPARE Signals 113
- ALTFP_COMPARE Parameters 114
- ALTFP_CONVERT IP Core 116
- ALTFP_CONVERT Output Latency 117
- Point Format Numbers 121
- Time Event 122
- ALTFP_CONVERT Signals 123
- ALTFP_CONVERT Parameters 125
- ALTERA_FP_FUNCTIONS IP Core 128
- Function Description 129
- ALTERA_FP_FUNCTIONS Signals 151
- Altera Corporation 152
- Send Feedback 152
- Document Revision History 156
- Date Document 157
- Changes Made 157
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