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Port Name Required Description
zero No Zero exception output. Asserted when the exponent and mantissa
of the output port are zero. This occurs when the actual input value
is 1 because ln 1 = 0.
nan No NaN exception output. Asserted when the exponent and mantissa
of the output port are all 1’s and non-zero, respectively. This occurs
when the input is a negative number or NaN.
Parameters
Table 12-7: ALTFP_LOG Megafunction Parameters
Parameter Name Type Required Description
WIDTH_EXP Integer Yes Specifies the precision of the exponent. If this
parameter is not specified, the default is 8. The bias
of the exponent is always set to 2
(WIDTH_EXP -1)
-1,
that is, 127 for the single-precision format and 1023
for the double-precision format. The value of the
WIDTH_EXP parameter must be 8 for the single-
precision format, 11 for the double-precision
format, and a minimum of 11 for the single-
extended precision format. The value of the WIDTH_
EXP parameter must be less than the value of the
WIDTH_MAN parameter, and the sum of the WIDTH_
EXP and WIDTH_MAN parameters must be less than
64.
WIDTH_MAN
Integer Yes Specifies the precision of the mantissa. If this
parameter is not specified, the default is 23. The
value of WIDTH_MAN must be 23 for the single-
precision format, and 52 for the double-precision
format. For the single-extended precision format,
the valid value ranges from 31 to 52. The value of
WIDTH_MAN must be greater than the value of WIDTH_
EXP, and the sum of WIDTH_EXP and WIDTH_MAN
must be less than 64.
PIPELINE Integer Yes Specifies the amount of latency in clock cycles used
in the ALTFP_LOG megafunction. Create the
ALTFP_LOG megafunction with the MegaWizard
Plug-In Manager to calculate the value for this
parameter.
12-6
Parameters
UG-01058
2014.12.19
Altera Corporation
ALTFP_LOG
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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