Altera Floating-Point Manual do Utilizador descarregar pdf (Página 96)

Time Event

102.5 ns Output value: FF80 0000h

The natural logarithm of zero is negative infinity.

5 ns data[] value: 8000 0000h

This is a negative number.

107.5 ns Output value: FFC0 0000h

Exception handling ports: nan asserts

The natural logarithm of a negative value is invalid. Therefore, the output produced

is a NaN.

30 ns data[] value: 0040 0000h

The is a denormal value.

132.5 ns Output value: FF80 0000h

As denormal numbers are not supported, the input is forced to zero before going

through the logarithm function. The natural logarithm of zero is negative infinity.

45 ns data[] value: 0080 0000h

This is the smallest valid input. All the input bits are 0 except the LSB of the

exponent field.

147.5 ns Output value: C2AE AC50h

60 ns data[] value: 3F80 0000h

The input value 3F80 0000h is equivalent to the actual value,

1.0 × 20 = 1.

152.5 ns Output value: 0000 0000h

Exception handling ports: zero asserts

Since In 1 results in zero, it produces an output of zero.

Signals

12-4

Signals

UG-01058

2014.12.19

Altera Corporation

ALTFP_LOG

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Altera Floating-Point Manual do Utilizador Página 96