Altera Floating-Point Manuel d'utilisateur Page 124
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Table 17-7: ALTFP_CONVERT Output Signals
Port Name Required Description
result[] Yes Output for the floating-point converter. The size of this output port
depends on the WIDTH_RESULT parameter value.
If the operation mode value is FLOAT2INT or FLOAT2FIXED, the output
bus is an IEEE floating-point representation.
If the operation mode is FLOAT2INT, the output bus is an integer
representation. If the selected precision is the single-precision format,
the output bus width value is 32. If the selected precision is the double-
precision format, the output bus width value is 64. If the selected
precision is the single-extended precision format, the input bus range is
from 43 to 64.
If the operation mode value is FLOAT2FLOAT, the output bus is an IEEE
floating-point representation. If the selected precision is the single-
precision format, the output bus is in the 64-bit double-precision
format. If the selected precision is the double-precision format, the
output bus is in the 32-bit single-precision format. If the selected
precision is the single-extended precision format, the output bus ranges
from 43 to 64.
overflow
No Optional overflow exception output. This port is available only when
the operation mode values are FLOAT2FIXED, FLOAT2INT, or
FLOAT2FLOAT.
Asserted when the result of the conversion (after rounding), exceeds
the maximum width of the result[] port, or when the dataa[] input
is infinity.
underflow No Optional underflow exception output. This port is available only when
the operation mode values are FLOAT2FIXED, FLOAT2INT, or
FLOAT2FLOAT.
Asserted when the result of the conversion, after rounding, is
fractional.
In FLOAT2INT operations, this port is asserted when the exponent value
of the floating-point input is smaller than the exponent bias.
In FLOAT2FLOAT operations, this port is asserted when the floating-
point input has a value smaller than the lowest exponent limit of the
target floating-point format.
nan No Optional NaN exception output. This port is available only when the
operation mode values are FLOAT2INT, FLOAT2FLOAT, or FLOAT2FIXED.
Asserted when the input port is a NaN representation.
If the operation mode value is FLOAT2INT or FLOAT2FIXED, the
result[] port is set to zero.
If the operation mode value is FLOAT2FLOAT, the result[] port is set to
a NaN representation.
UG-01058
2014.12.19
ALTFP_CONVERT Signals
17-9
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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