GENIAL TIMELINE

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

PASSO 5

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

PASSO 1

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 3

l’istruzione passa in esecuzione sull’ALU

PASSO 6

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

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

PASSO 4

LA CPU

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

PASSO 9

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

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:

PASSO 8

PASSO 7.1-7.4

PASSO 8.1-8.3

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