Altera Floating-Point Uživatelský manuál Strana 98
- Strana / 157
- Tabulka s obsahem
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Hodnocené. / 5. Na základě hodnocení zákazníků
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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