GENIAL TIMELINE

LA CPU

PASSO 3

PASSO 5

PASSO 1

la CPU trasmette il contenuto del registro interno PC, che contiene l’indirizzo della prossima istruzione da leggere dalla memoria, al registro MAR e attiva la linea Leggi

la CPU trasmette il contenuto del registro MDR al registro IR per la codifica dell’istruzione

la memoria riceve due informazioni dalla CPU, l’indirizzo della cella (dal BUS indirizzi) e il segnale leggi. Questi due segnali informano la memoria che l’operazione richiesta dalla CPU è una lettura

PASSO 4

PASSO 6

PASSO 2

la memoria invia alla CPU il dato presente nella cella indicata tramite il BUS dati. A questo punto il dato letto è nel registro MDR

il registro MAR ha lo scopo di mantenere l’indirizzo attivo sulle linee del BUSindirizzi

l’istruzione passa in esecuzione sull’ALU

PASSO 9

PASSO 8

PASSO 7

terminata l’esecuzione, la CPU trasmette al registro destinazione il valore prodotto dall’ALU. Se l’istruzione prevede una scrittura in memoria del valore calcolato procede nel modo seguente:

se l’istruzione prevede la lettura di operandi dalla memoria, questi devono essere caricati dalla memoria ai registri tramite un’operazione di fetch degli operandi, così riassumibile

si ritorna al punto 1 dopo aver aggiornato il valore di PC (prossima istruzione da eseguire)

PASSO 7.1-7.4

PASSO 8.1-8.3

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