Motorola DSP56000 User Manual

 

MOTOROLA

SECTION 3.1 DATA ARITHMETIC LOGIC UNIT  ............................................. 3

SECTION 3.2 OVERVIEW AND DATA ALU ARCHITECTURE  ....................... 3

3.2.1 Data ALU Input Registers (X1, X0, Y1, Y0)  ........................................ 5
3.2.2 MAC and Logic Unit ............................................................................ 6
3.2.3 Data ALU A and B Accumulators ........................................................ 7
3.2.4 Accumulator Shifter  ............................................................................ 9
3.2.5 Data Shifter/Limiter  ............................................................................. 9

3.2.5.1 Limiting (Saturation Arithmetic)  .................................................. 9
3.2.5.2 Scaling ........................................................................................ 10

SECTION 3.3 DATA REPRESENTATION AND ROUNDING  .......................... 10

SECTION 3.4 DOUBLE PRECISION MULTIPLY MODE  ................................. 16

SECTION 3.5 DATA ALU PROGRAMMING MODEL ....................................... 19

SECTION 3.6 DATA ALU SUMMARY  .............................................................. 19