השעון Hertz=1/sec מחשב פנטיום במהירות של פירושו שהוא מבצע 8^10 2 מחזורי שעון בשניה. כל מחזור שעון לוקח 200MHZ 510^-9=5nanosecond כמה לוקחת פקודה בימינו?

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Presentation transcript:

השעון Hertz=1/sec מחשב פנטיום במהירות של פירושו שהוא מבצע 8^10 *2 מחזורי שעון בשניה. כל מחזור שעון לוקח 200MHZ 5*10^-9=5nanosecond כמה לוקחת פקודה בימינו?

PIPELINE הרעיון מאחורי

חלוקה לשלבים

הוספת הרגיסטרים

!!! תיקון

תצוגה גרפית

Control

קווי הבקרה

Datapath with Control

דוגמא Lw $10,20($1) Sub $11,$2,$3 And $12,$4,$5 Or $13,$6,$7 Add $14,$8,$9

Hazards

דוגמא sub$2, $1, $3 and $12, $2, $5 or$13, $6, $2 add$14, $2, $2 sw$15, 100($2)

דוגמא sub$2, $1, $3 nop and $12, $2, $5 or$13, $6, $2 add$14, $2, $2 sw$15, 100($2)

Forwarding – גניבת הערכים

Forwarding

לא תמיד הפתרון עובד

דוגמא Sub $2,$1,$3 And $4,$2,$5 Or$4,$4,$2 Add $9,$4,$2

Bubbles

Hazard detection unit

Branch Hazards

Flushing