Texas Instruments TMS320C3x - Manual (Page 132)

Floating-Point Multiplication
5-27 Data Formats and Floating-Point Operation
- If c(exp) has overflowed (step 11) in the positive direction, then step 14
sets c(exp) to the most positive extended-precision format value. If c(exp)
has overflowed in the negative direction, then step 14 sets c(exp) to the
most negative extended-precision format value.
- If c(exp) has underflowed (step 12), then step 15 sets c to 0; that is,
c(man) = 0 and c(exp) = –128.