ST10R272 datasheet(14/77 Pages) STMICROELECTRONICS

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ST10R272L - MULTIPLY-ACCUMULATE UNIT (MAC)

MULTIPLY-ACCUMULATE UNIT (MAC)

The MAC is a specialized co-processor added to the ST10R272L CPU core to improve the

performance of signal processing algorithms. It includes:

•

a multiply-accumulate unit

•

an address generation unit, able to feed the mac unit with 2 operands per cycle

•

a repeat unit, to execute a series of multiply-accumulate instructions

New addressing capabilities enable the CPU to supply the MAC with up to 2 operands per

instruction cycle. MAC instructions: multiply, multiply-accumulate, 32-bit signed arithmetic

operations and the CoMOV transfer instruction have been added to the standard instruction

set. Full details are provided in the ‘ST10 Family Programming Manual’.

Figure 5 MAC architecture

MAC CoProcessor

dual-port

internal RAM

external

memory

program

new addressing features

IDX0

IDX1

QX0

QX1

QR0

QR1

operands

control

program code

data buses

16 x16

multiplier

40-bit ALU

shifter

MCW MAL

MRW MAH

MSW

repeat unit

40-bit accumulator

Peripheral

interface

ST10R272L CPU

ST10R272 Datasheet(PDF) 14 Page - STMicroelectronics

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