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V2Xe User Manual – May 2012 Page 9

5.2 Parameter Formats

Note: Floating-point based parameters conform to ANSI/IEEE Std 754-1985. Please refer to the

Standard for more information. PNI also recommends the user refer to the compiler’s instructions to

understand how the compiler implements floating-point format.

32 Bit Floating Point (Float32)

Shown below is the 32 bit float format in big Endian. In little Endian format, the 4

bytes are in reverse order (LSB first).

ExponentS Mantissa

3130 2322 0

The value (v) is determined as, if and only if 0 < Exponent < 255): v = (-1)

2(Exponent-127) * 1.Mantissa. Zero is represented by 4 bytes of zeros.

Signed 32 Bit Integer (SInt32)

SInt32-based parameters are signed 32 bit numbers (2’s compliment). Bit 31

represents the sign of the value (0=positive, 1=negative)

msb

31 24 23 16 15 8

lsb

7 0

Big Endian

lsb

7 0 15 8 23 16

msb

31 24

Little Endian

Signed 16 Bit Integer (SInt16)

SInt16-based parameters are signed 16 bit numbers (2’s compliment). Bit 15

represents the sign of the value (0=positive, 1=negative)

Big Endian

msb

15 8

lsb

7 0

Little Endian

lsb

7 0

msb

15 8

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 19 20

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Pni CompassPoint V2Xe Manual de usuario Pagina 11