Altera Floating-Point Uživatelský manuál stáhnout pdf (Strana 84)

Time Event

10 ns data[] value: 7F80 0000h

This is an infinity value.

107.5 ns Output value: 0000 0000h

Exception handling ports: zero asserts

The inverse of an infinity value produces a zero.

60 ns data[] value: 7FC0 0000h

This is a NaN.

157.5 ns Output value: 7FC0 0000h

Exception handling ports: nan asserts

The inverse of a NaN results in a NaN

70 ns data[] value: 0000 1000h

This is a denormal number.

167.5 ns Output value: 7F80 0000h

Exception handling ports: nan deasserts, division_by_zero asserts

Denormal numbers are forced-zero values, therefore, the inverse of a zero results in

infinity.

Ports

Table 10-4: ALTFP_INV Megafunction Input Ports

Port Name Required Description

aclr No Asynchronous clear. When the aclr port is asserted high, the

function is asynchronously cleared.

clk_en No Clock enable. When the clk_en port is asserted high, an

inversion value operation takes place. When signal is asserted

low, no operation occurs and the outputs remain unchanged.

clock Yes Clock input to the megafunction.

data[] Yes Floating-point input data. The MSB is the sign, the next MSBs

are the exponent, and the LSBs are the mantissa. This input port

size is the total width of the sign bit, exponent bits, and mantissa

bits.

10-4

Ports

UG-01058

2014.12.19

Altera Corporation

ALTFP_INV IP Core

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Altera Floating-Point Uživatelský manuál Strana 84