EE457_ch7_P2_L

EE457_ch7_P2_L - 7—37-l Lookup “73ng MAB in MEMORy...

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Unformatted text preview: 7—37-l Lookup “73ng MAB in MEMORy FIGURE 7.27 The posslble comblnatlons of events In the TLB, vlrtual memory system, and cache. Three of these combinations are impossible, and one is possible (TL it, irtual memory hit, cache miss) but never detected. . l-me ' 86 $me {Quid A933 11 /01 . Divide and show DIR PAGE and OFFSET Vrtual dd .sf mth CU . .. ' ' ——*———-—l a mg m C P fields lo iacnlllale PD/PT access VA3 VAZ VA“ VAIS VA" VA15 VAn VA“ VA") MEMMM .v '2 A-Table PDBR (Page Direclory) B_Table Second level Page Table C-Table Third level Page Table MMMMMM @ME&MMMWWEMWwflflflflflflflflflflflflfl Divide and show PPFN and Physical address page Offset A-Table, B-Table, and C-Table access and Physical address formation Kfifiqfi) BE7 - BEO ' 8619111111118 [WEI 191733 [I /II rqpueg - '00; n pa>m noK adoH 'asmoa syq) Buyqoee; pafiolua 1 '86_ ’[g Alnf Aeppg Aq 59pm? 190d 0; padxa II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II II 0” 1’ Virtual address from the CPU 89! h sicaI address Divide and show VPN and OFFSET IiIeIds. Divide VPN Iunher imo TAG and SET IieIds IO IaCIIiIale TLB access 2 B—E7-B—EO Divide and show ' l . - 1;. Inmaeyf‘ Edda an percacflu TLB access and Physical address formation II /01 ' 8619mumS IWH £91733 VP N --~-—-—————->- ‘—— PAC E SET [ \My—MMWCSBmg | I O” MMMMMMMMMMMMM <-——- ' Q31“ 5 V A10 -VA 4 I P D‘eclo (age " 'Y) B-Table Second level Page Table C-Table Third level Page Table MMMMM MMMM&MMMMMEMMMWMMMHMHEMHHHM 4—“ PAGE OFFSET Divide and show PPFN and W Page 011591. A-Table, B-Table, and C-Table access and Physical address formation 13—12743—12'0 (VAle- VA¢> I7 ‘ Aaw% VAle-VAS 867-8gz 2 2 Lima: BE7 - BEO ’ng Amf Aeppd liq sepexfi 190d 0; padxa 11 NJ. ' 8619mumS [WEI A9733 — '00) 1; pa>m noA edoH '95an3 SN) Suwanee) paK0[ua 1 '85~ NPUED Se! A ( _ Physmal addrcss 0‘ Ida 3:1; ow an [6 bit); 6-bi55 Wm -VAI7 Virtual address from the CPU SE ‘ PAGE OFFSE’T Divide and show VPN and OFFSET lilelds. Divide VPN funher lmo TAG and SET fields In lacilitale TLB access BELEI .) Set 5] ’ ITa +Valid ENVY 0: ppm iTa + Vlid Entry 1 ppFN ' - ------- ..................... _______________ _' 7 E-I-E—EO PAxs —— PAL; (mm; / 4 I III M TLB access and Physical address formation ...
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This note was uploaded on 04/14/2011 for the course EE 457 taught by Professor Puvvada during the Spring '08 term at USC.

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EE457_ch7_P2_L - 7—37-l Lookup “73ng MAB in MEMORy...

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