DS72011RB120FPV datasheet(93/1196 Pages) RENESAS

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Section 3 Floating-Point Unit (FPU)

Rev. 2.00 Sep. 07, 2007 Page 65 of 1164

REJ09B0321-0200

Table 3.2 shows the ranges of the various numbers in hexadecimal notation.

Table 3.2

Floating-Point Ranges

Type

Single-Precision

Double-Precision

Signaling non-number

H'7FFF FFFF to H'7FC0 0000

H'7FFF FFFF FFFF FFFF to

H'7FF8 0000 0000 0000

Quiet non-number

H'7FBF FFFF to H'7F80 0001

H'7FF7 FFFF FFFF FFFF to

H'7FF0 0000 0000 0001

Positive infinity

H'7F80 0000

H'7FF0 0000 0000 0000

Positive normalized

number

H'7F7F FFFF to H'0080 0000

H'7FEF FFFF FFFF FFFF to

H'0010 0000 0000 0000

Positive denormalized

number

H'007F FFFF to H'0000 0001

H'000F FFFF FFFF FFFF to

H'0000 0000 0000 0001

Positive zero

H'0000 0000

H'0000 0000 0000 0000

Negative zero

H'8000 0000

H'8000 0000 0000 0000

Negative denormalized

number

H'8000 0001 to H'807F FFFF

H'8000 0000 0000 0001 to

H'800F FFFF FFFF FFFF

Negative normalized

number

H'8080 0000 to H'FF7F FFFF

H'8010 0000 0000 0000 to

H'FFEF FFFF FFFF FFFF

Negative infinity

H'FF80 0000

H'FFF0 0000 0000 0000

Quiet non-number

H'FF80 0001 to H'FFBF FFFF

H'FFF0 0000 0000 0001 to

H'FFF7 FFFF FFFF FFFF

Signaling non-number

H'FFC0 0000 to H'FFFF FFFF

H'FFF8 0000 0000 0000 to

H'FFFF FFFF FFFF FFFF

3.2.2

Non-Numbers (NaN)

Figure 3.3 shows the bit pattern of a non-number (NaN). A value is NaN in the following case:

• Sign bit: Don't care

• Exponent field: All bits are 1

• Fraction field: At least one bit is 1

The NaN is a signaling NaN (sNaN) if the MSB of the fraction field is 1, and a quiet NaN (qNaN)

if the MSB is 0.

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