Altera Floating-Point - Manual (Page 78)

Time Event
82.5 ns Output value: 3F80 0000h
As the input value of 1A03568Ch is a very small number, it is seen as a value that is
approaching zero, and the result approaches 1 (which is represented by 3F800000).
Exponential operations carried out on numbers of very small magnitudes result in a
1 and assert the
underflow
flag.
Exception handling ports:
underflow
asserts
30 ns
data[]
value: F3FC DEFFh
This is a normal negative value of a very large magnitude.
112.5 ns Output value: 0000 0000h
The outcome of exponential operations on negative numbers of very large
magnitudes approaches zero.
Exception handling ports:
underflow
remains asserted
60 ns
data[]
value: 7F80 0000h
This is a positive infinite value.
142.5 ns Output value: 7F80 0000h
The operation on positive infinite values results in infinity.
Exception handling ports:
underflow
deasserts,
overflow
asserts
90 ns
data[]
value: 7FC0 0000h
This is a NaN.
172.5 ns Output value: 7FC0 0000h
The exponential of a NaN results in a NaN.
Exception handling ports:
nan
asserts
120 ns
data[]
value: C1D4 49BAh
This is a normal value.
202.5 ns Output value: 2C52 5981h
The result is a normal value.
Exception handling ports:
nan
deasserts
ALTFP_EXP Signals
9-4 ALTFP_EXP Signals
UG-01058
2014.12.19
Altera Corporation ALTFP_EXP IP Core
Send Feedback