Motorola DSP Developer's Kit

max-1r.asm

Motorola DSP Developer's Kit

max-1r.asm

Motorola DSP Developer's Kit

max-1r.asm

[y, index] = mot###_max(X)

Input/Output

Input: Real vector X

Output: Real value Y (largest element of X), index

Algorithm

#define    IN0
MaxValue = X[0];
Index = 0;
for(i=1; i<size; i++)
{
if(X[i] > MaxValue)
{
    MaxValue = X[i];
    index = i;
}
}

Memory & Register

Memory allocation:

X memory: label IN points to the location of the real data input of vector X.

Register usage:

• Register A stores Max-1r Result y
• R1 stores the index of the largest element of X
• R4 stores the number of items in the array

Status Register

The assembly function max-1r-r.asm does not explicitly set any status registers/bits.

Data Size Limit

The length of vector X can't be larger than the continuous available data memory size.

Data Range Limit

The value of input vector X must be between -1.0 and +1.0.

Precision

In the case of DSP563, precision is 23 bits.

In the case of DSP566, precision is 15 bits.

Performance Limit

DSP563:

DSP566:

log10-c.asm

max-1c.asm