Altera Floating-Point Manual do Utilizador descarregar pdf (Página 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

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Altera Floating-Point Manual do Utilizador Página 78