Altera Floating-Point - Manual (Page 124)

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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