By Analog Devices, Amy Mar
This reference for the ADSP-2100 relations is an architectural and code-compatible set of 16-bit fixed-point DSP microprocessors that provide various degrees of characteristic integration. It bargains quickly, versatile mathematics for all computations together with the multiply-accumulate, prolonged dynamic variety in computations to lessen scaling, trunkation, and slipping, software sequencing with zero-overhead looping, twin facts handle iteration with round buffering and bit-reversed addressing, and three-bus Harvard structure allowing single-cycle fetch of either guide and information values.
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Extra info for Digital Signal Processing Applications Using the ADSP 2100 Family, Volume I
Note how the signed/unsigned switch indicates the type of multiplication for each partial product. 8. In this Fixed-Point Arithmetic 2 routine, the multiplicand and the multiplier are both stored in data memory, LSW first, the multiplicand starting at DM(I0) and the multiplier starting at DM(I1). The routine produces a 96-bit result stored LSW first, starting at DM(I2). The X and Y buffers must be declared (and located in memory) as circular buffers; L0 and L1 are set to three because the routine circles back to refetch the first words of the operands.
The NORM instruction of the shifter uses the negative of the value in SE for the magnitude of the shift. The value in SE is then added to the exponent of the result to yield the normalized exponent. 5 FLOATING-POINT SUBTRACTION The algorithm for subtracting one number from another in two-word floating-point format is as follows: 1. Determine which number has the larger exponent. Let’s call this number X (= Ex, Fx) and the other number Y (= Ey, Fy). 2. Set the exponent of the result to Ex. 3. Shift Fy right by the difference between Ex and Ey, to align the radix points of Fx and Fy.
The IEEE 754 floating-point MSW is read from MR1, and the LSW is read from MR0. 15 fixed-point result is returned in MX1, and the error word is returned in MX0. The routine first checks the input for the special cases of integers –1 and 0. If the input is either of these integers, the conversion is loaded into MX1 directly and returned. 15 fixed-point format range. If it is, the input is examined further to set the appropriate error word for the error condition. Then the error word is toggled if the eight LSBs of the input number are not all zeros.