DS72011RB120FPV datasheet(92/1196 Pages) RENESAS

92 / 1196 page

Section 3 Floating-Point Unit (FPU)

Rev. 2.00 Sep. 07, 2007 Page 64 of 1164

REJ09B0321-0200

Figure 3.2 Format of Double-Precision Floating-Point Number

The exponent is expressed in biased form, as follows:

e = E + bias

The range of unbiased exponent E is E

min – 1 to Emax + 1. The two values Emin – 1 and Emax + 1 are

distinguished as follows. E

min – 1 indicates zero (both positive and negative sign) and a

denormalized number, and E

max + 1 indicates positive or negative infinity or a non-number (NaN).

Table 3.1 shows E

min and Emax values.

Table 3.1

Floating-Point Number Formats and Parameters

Parameter

Single-Precision

Double-Precision

Total bit width

32 bits

64 bits

Sign bit

1 bit

Exponent field

8 bits

11 bits

Fraction field

23 bits

52 bits

Precision

24 bits

53 bits

Bias

+127

+1023

max

+127

+1023

min

–126

–1022

Floating-point number value v is determined as follows:

If E = E

max + 1 and f ≠ 0, v is a non-number (NaN) irrespective of sign s

If E = E

max + 1 and f = 0, v = (–1)

s (infinity) [positive or negative infinity]

If E

min ≤ E ≤ Emax, v = (–1)

s2E (1.f) [normalized number]

If E = E

min – 1 and f ≠ 0, v = (–1)

s2Emin (0.f) [denormalized number]

If E = E

min – 1 and f = 0, v = (–1)

s0 [positive or negative zero]

DS72011RB120FPV 데이터시트(PDF) 92 Page - Renesas Technology Corp

DS72011RB120FPV 데이터시트(HTML) 92 Page - Renesas Technology Corp

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

데이터시트 다운로드

링크 URL