ST10F273 datasheet(47/179 Pages) STMICROELECTRONICS

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ST10F273

Central processing unit (CPU)

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7.1

Multiplier-accumulator unit (MAC)

The MAC coprocessor is a specialized coprocessor added to the ST10 CPU Core in order to

improve the performances of the ST10 Family in signal processing algorithms.

The standard ST10 CPU has been modified to include new addressing capabilities which

enable the CPU to supply the new coprocessor with up to 2 operands per instruction cycle.

This new coprocessor (so-called MAC) contains a fast multiply-accumulate unit and a repeat

unit.

The coprocessor instructions extend the ST10 CPU instruction set with multiply, multiply-

accumulate, 32-bit signed arithmetic operations.

Figure 6.

MAC unit architecture

Operand 2

Operand 1

Control Unit

Repeat unit

ST10 CPU

Interrupt

controller

MSW

MRW

MAH

MAL

MCW

Flags MAE

Mux

8-bit left/right

shifter

Mux

Sign Extend

16 x 16

Concatenation

signed/unsigned

multiplier

40-bit signed arithmetic unit

08000h

Scaler

GPR Pointers *

IDX0 pointer

IDX1 pointer

QR0 GPR offset register

QR1 GPR offset register

QX0 IDX offset register

QX1 IDX offset register

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