Altera Floating-Point Manuel d'utilisateur Page 126
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Port Name Type Required Description
WIDTH_DATA Integer Yes Specifies the input data width.
If the operation is INT2FLOAT, the WIDTH_DATA is also
WIDTH_INT.
If the operation is FIXED2FLOAT, the data width value is
WIDTH_INT + fractional width.
If the operation is FLOAT2FIXED, FLOAT2INT or
FLOAT2FLOAT, the data width value is WIDTH_EXP_INPUT
+ WIDTH_MAN_INPUT + 1.
The available settings are 32 bits, 64 bits or n bits. For n
bits settings, the range is from 4 bits to 64 bits.
WIDTH_EXP_
OUTPUT
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 WIDTH_EXP_OUTPUT 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 WIDTH_EXP_
OUTPUT must be less than the value of WIDTH_MAN_
OUTPUT, and the sum of WIDTH_EXP_OUTPUT and WIDTH_
MAN_OUTPUT must be less than 64. These settings apply
only to the FLOAT2FIXED, FLOAT2INT, and FLOAT2FLOAT
operation modes.
WIDTH_MAN_
OUTPUT
Integer Yes Specifies the precision of the mantissa. If this parameter
is not specified, the default is 23. When WIDTH_EXP_
OUTPUT is 8 and the floating point format is single-
precision, the WIDTH_MAN_OUTPUT value must be 23.
Otherwise, the value of WIDTH_MAN_OUTPUT must be a
minimum of 31. The value of WIDTH_MAN_OUTPUT must
be greater than the value of WIDTH_EXP_OUTPUT, and the
sum of WIDTH_EXP_OUTPUT and WIDTH_MAN_OUTPUT must
be less than 64. These settings apply only to the
FLOAT2FIXED, FLOAT2INT, and FLOAT2FLOAT operation
modes.
WIDTH_RESULT Integer Yes Specifies the width of the output result. In an INT2FLOAT,
FLOAT2FLOAT, or FIXED2FLOAT operation, the result
width is WIDTH_EXP_OUTPUT + WIDTH_MAN_OUTPUT + 1.
In a FLOAT2INT operation, the result width is the value of
the WIDTH_INT parameter.
In a FLOAT2FIXED operation, this parameter is the result
width.
The available settings are 32 bits, 64 bits or n bits. For n
bits settings, the range is from 4 bits to 64 bits.
ROUNDING Integer Yes Specifies the rounding mode. The default value is TO_
NEAREST. Other modes are not supported.
UG-01058
2014.12.19
ALTFP_CONVERT Parameters
17-11
ALTFP_CONVERT IP Core
Altera Corporation
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- 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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