Chức nă ng và thông sỉ của BUS

Một phần của tài liệu Kiến trúc máy tính (Trang 36 - 43)

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o⁄› ›|›fi„\ʻ“Ă RV

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L?nã fiã ?|ớfi? !?“ƒửã?|⁄›?ʻã M L?h‹fiã ?‹⁄ị‹? !?“ƒửã? .?ʻã M

L?h‹N?nã ?Ô⁄ƒ?“ề?ƒ‹fiã K?Ô⁄ƒ?“ề?›ã fiã M

o⁄› ›|›fi„\ʻ“Ă RW

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Tên bus Lĩnh vực á p dụng

L?b\ô\| uị ?“6?⁄ệ ?‹⁄Ơ‹

L?dhr̀ l" ? Ỉ?⁄ử? ⁄!‹Ê?~(‹Ê?ʻ"?uwk?WORU L?hal?obK?obǸs lế„ ỵ‹⁄?hal?obK?halNobǸs

L?l\ ʻã lế„?oco L?P? ề?ùw

L?lƒ|‒›|⁄\‹‹Ă“ lế„?orNQ

o⁄› ›|›fi„\ʻ“Ă RX L?lã“ ƒʻã ?hh l" ? !?⁄ử? ⁄!‹Ê?|š?uwk?WORWU

L?uĂ‒ \ʻã l" ? !?⁄ử? ⁄!‹Ê?~(‹Ê?uwk?l› ›‒›“\

L?uld l" ? !?⁄ử? ⁄!‹Ê?~(‹Ê?uwk?UW‚O?|*\?l› ›‒›“\M mÊÍ#ƒ? \? ⁄Í#‹Ê?fi⁄Ơ‹?“›ệƒ?ʻã ? ⁄Ă›?ʻ\?|ế|⁄? \ãY

PM?s⁄Ă›? ?|⁄1|?fi⁄ỡ‹?|1‹Ê?G‹⁄Í?|ế|?“›ệƒ?ʻã ?‹èã? ‒è‹H

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Sự làm việc của cá c bus

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⁄ƒừ ?ʻÿ? ⁄‑?Ị"‹Ê?“ề? &?G “\ ĂHM

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Bus Driver và Bus Receiver.

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⁄ể?‹ ƒHM

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hhMQM?aã ?Ịž‹Ê?ʻ"?Gr„‹|⁄‒›‹›ã ?ʻã H

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- T1?ʻĩ ?Ịỡã?ʻÙ‹Ê? Í#‹?“è‹?|*\? ỵ‹?⁄ƒửã?Ịž‹Ê?⁄ž K? ‒›‹Ê?ô" ?fi⁄ỡ‹? ⁄#ƒ?ʃ\‹|*\?sPK?lot?Ịơ ?Ịÿ\?|⁄ự?|*\?ʻ„ Ă?| ỡ‹?Ị™|?“è‹?ʻã ?Ịÿ\?|⁄ựM?r\ã?Ô⁄ƒ? ỵ‹?⁄ƒửã?Ịÿ\?|⁄ự |*\?sPK?lot?Ịơ ?Ịÿ\?|⁄ự?|*\?ʻ„ Ă?| ỡ‹?Ị™|?“è‹?ʻã ?Ịÿ\?|⁄ựM?r\ã?Ô⁄ƒ? ỵ‹?⁄ƒửã?Ịÿ\?|⁄ự ỊÍ'|? ⁄ƒừ ?“ịfi?ʃế? ‒ÿ?ô&ƒK?lot?Ịơ ?|ế|? ỵ‹?⁄ƒửã MREQ? ề RD? ỵ|⁄?|2|M?sỵ‹?⁄ƒửã

MREQ?GôĂô›‒„?‒ĂflãĂ K? ‒ã„?|ịfi?ʻ"?‹⁄&H?|⁄1?Ô⁄Ỉ‹Ê?fi⁄ểƒ? ⁄ƒừ ?ʻÿ?hNnZ?| Š‹? ỵ‹?⁄ƒửã

RD?GqĂ\~H?|⁄™‹?qĂ\~M

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- T3? ệƒ? Í#‹?‚ã‹Ê?‚ã!‹Ê?|*\?sRK?lot?‹⁄ị‹?~0?“ƒửã? ‒è‹?ʻã ?~0?“ƒửãK?|⁄1\ề›? ⁄\‹⁄?Ê⁄ƒ?ʻè‹? ‒›‹Ê?lot? ề?|⁄! ?~0?“ ƒửãM?r\ã?Ịš?lot?Ịể›?|ế|? ỵ‹?⁄ƒửã MREQ ề›? ⁄\‹⁄?Ê⁄ƒ?ʻè‹? ‒›‹Ê?lot? ề?|⁄! ?~0?“ ƒửãM?r\ã?Ịš?lot?Ịể›?|ế|? ỵ‹?⁄ƒửã MREQ

RDM

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- TAD :? ⁄Ă›?ʃể‹?Ịž? ⁄#ƒ?ʃ\‹K?s̀c ?PPO‹ K?ỊƠ„?“ề? ⁄Ỉ‹Ê? !?~›?‹⁄ề? ể‹?‚ãớỊểô?ʻể›K?lot? ù?ỊÍ\?‒\? ỵ‹?⁄ƒửã?Ịÿ\?|⁄ự?Ô⁄Ỉ‹Ê?|⁄ịô?⁄ÍĨ‹?PPO‹ ? ỵ‹⁄? .? ⁄#ƒ?Ịƒúô Ịểô?ʻể›K?lot? ù?ỊÍ\?‒\? ỵ‹?⁄ƒửã?Ịÿ\?|⁄ự?Ô⁄Ỉ‹Ê?|⁄ịô?⁄ÍĨ‹?PPO‹ ? ỵ‹⁄? .? ⁄#ƒ?Ịƒúô ʃ0\? Í#‹?“è‹?|*\?sPM

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j⁄›ể‹Ê? ⁄#ƒ?ʃ\‹?ʻĩ ?ʻã"|?Ị!ƒ? &ƒ?s̀c? ề?scr?|+‹Ê?‹šƒ?“è‹?‒Ù‹ÊK? ‒›‹Ê? ‒Í#‹Ê ⁄'fi?‚ớã?‹⁄ớ K?ʻ"?‹⁄&?|⁄ự?|š?QTO?J?QTOJ?PQT L?PPO L?TO?Ơ?SUT‹ ? ỵ‹⁄? .? ⁄#ƒ?Ịƒúô?|š ỵ‹?⁄ƒửã?Ịÿ\?|⁄ự?|⁄›? &ƒ?Ô⁄ƒ?‹š?ỊÍ\?~0?“ƒửã?‒\?ʻã ?Ịÿ\?|⁄ựM?mừã?ʻ"?‹⁄&?Ô⁄Ỉ‹Ê?Ịếfi?1‹Ê Ị*?‹⁄\‹⁄K?‹š?|ỡ‹?fi⁄ểƒ?fi⁄ế ? ỵ‹?⁄ƒửã?‚ƒ‹?|⁄# WAIT? ‒Í&|? Í#‹?‚ã!‹Ê?|*\?sQM?s⁄\›

ế|?‹ề„?ỊÍ\? ⁄èô? ề›?ô" ? ‒ệ‹Ê? ⁄ếƒ?|⁄#?G•\ƒ ? \ ĂHK?Ô⁄ƒ?ʻ"??‹ ⁄&?Ịễ?ỊÍ\?‒\?~0?“ƒửã ‹?Ịÿ‹⁄K?‹š? ù?Ịể›? ỵ‹?⁄ƒửã WAIT? ⁄ề‹⁄v̀hsM

- TM L:?ấểô?ʻể›?‒Ù‹Ê? ỵ‹?⁄ƒửã?Ịÿ\?|⁄ự? ù?ỊÍ'|? ⁄ƒừ ?“ịfi? ‒Í&|? ỵ‹?⁄ƒửã MREQ?ỵ‹⁄ớ ?“ề?UO‹ M?j⁄›ể‹Ê? ⁄#ƒ?ʃ\‹?‹ề„?“ề?flã\‹? ‒™‹Ê?‹ừã? ỵ‹?⁄ƒửã MREQ?Ịƒũã?Ô⁄ƒú‹? 2 ‹⁄ớ ?“ề?UO‹ M?j⁄›ể‹Ê? ⁄#ƒ?ʃ\‹?‹ề„?“ề?flã\‹? ‒™‹Ê?‹ừã? ỵ‹?⁄ƒửã MREQ?Ịƒũã?Ô⁄ƒú‹? 2

ệ›?‒\? ỵ‹?⁄ƒửã?|⁄™‹?|⁄ƒfi?brK?ʻ$ƒ? ?ô" ? !?|⁄ƒfi?‹⁄&?ỊŠƒ?⁄Žƒ?fi⁄ểƒ?‹⁄ị‹?ỊÍ'|? ỵ‹?⁄ƒửã Ịÿ\?|⁄ự? ‒Í&|? ỵ‹?⁄ƒửã?|⁄™‹?|⁄ƒfiM m⁄Í? ị„?Ô⁄Ỉ‹Ê? ⁄ú?|⁄™‹?|⁄ƒfi?‹⁄&? &ƒ? ⁄#ƒ?ʃ\‹

⁄ƒừ ?“ịfi?“ề?VT‹ M

- TM, TRL:?bế|?ʃế? ‒ÿ?ʻĩ ?ʻã"|?Ị!ƒ? &ƒ?Q?Ị ệƒ?“Í'‹Ê?‹ề„?|š?6?‹Ê⁄ý\?“ề?|ể?⁄\ƒỵ‹?⁄ƒửã MREQ? ề RD? ù?“ề? ỵ|⁄?|2|? ‒›‹Ê?Ô⁄›ể‹Ê? ⁄#ƒ?ʃ\‹?WT‹ ? ỵ‹⁄? .? ⁄.ƒ?Ịƒúô ỵ‹?⁄ƒửã MREQ? ề RD? ù?“ề? ỵ|⁄?|2|? ‒›‹Ê?Ô⁄›ể‹Ê? ⁄#ƒ?ʃ\‹?WT‹ ? ỵ‹⁄? .? ⁄.ƒ?Ịƒúô ‚ã!‹Ê?|*\?‚ã‹Ê?Ịž‹Ê?⁄ž?sPM?s‒›‹Ê? ‒Í#‹Ê?⁄'fi?‚ớã?‹⁄ớ K?|⁄ƒfi?‹⁄&?|⁄ự?|š?QTO?J?QTO L?WTL?TO?Ơ?RUT‹ ? \ã Ô⁄ƒ?⁄\ƒ? ỵ‹?⁄ƒửã? ‒è‹?“ề? ỵ|⁄?|2|?Ịú?ỊÍ\?~0?“ƒửã?‒\?ʻã M?r2?ʻĩ ʻã"|? ũ? ⁄#ƒ?ʃ\‹?‹ề„?ʻ ? ã‹Ê? ⁄èô? 2?ʻĩ ?ʻã"|? ⁄#ƒ?ʃ\‹? &ƒ? ỵ‹?⁄ƒửã?Ịž‹Ê?⁄žM

- TM H, TRH:?g\ƒ?Ịệƒ?“Í'‹Ê?‹ề„?|⁄›?ʻƒừ ?|ỡ‹?|š?ʻ\›?‹⁄ƒèã? ⁄#ƒ?ʃ\‹?Ịú?|ế|? ỵ‹⁄ƒửã MREQ? ề RD? ù?ỊÍ'|?Ịể›? \ã?Ô⁄ƒ?~0?“ƒửã?Ịễ?ỊÍ'|?lot?Ị™|? ề›M ⁄ƒửã MREQ? ề RD? ù?ỊÍ'|?Ịể›? \ã?Ô⁄ƒ?~0?“ƒửã?Ịễ?ỊÍ'|?lot?Ị™|? ề›M

- TDH:b⁄›?ʻƒừ ?ʻ"?‹⁄&?|ỡ‹?fi⁄ểƒ?“Íã?~0?“ƒửã?ʻ\›?“Ơã? ‒è‹?ʻã ? \ã?Ô⁄ƒ? ỵ‹?⁄ƒửã

o⁄› ›|›fi„\ʻ“Ă SP

Block Transfer, truyền tải khỉi dữ liệu.

mÊ›ềƒ? |ế|? |⁄ã? Ô3? Ị™|N? Ê⁄ƒK? ô" ? !? ʻã ? Ịž‹Ê? ʻ"? |Š‹? ⁄ ? ‒'? ‒ã„ũ‹? ~0? “ƒửã ⁄Ă›?Ô⁄!ƒM?j⁄ƒ?ô" ? ⁄\›? ế|?Ị™|N?Ê⁄ƒ?ʻĩ ?ỊỡãK?ʻã ?ô\ Ă‒?ʻế›?|⁄›? “\ Ă?ʻƒừ ?|š?ʻ\› ‹⁄ƒèã?ʻ„ Ă?|ỡ‹? ‒ã„ũ‹?ỊƒK? \ã?Ịš? “\ Ă? ù?“ƒè‹? ‑|?ỊÍ\?‒\?ô ƒ?|⁄ã?Ô3?ô" ?ʻ„ ĂK?|⁄› Ịừ‹?Ô⁄ƒ?Ị*? !?ʻ„ Ă?ỊÍ'|? ⁄Ỉ‹Ê?ʻế›M?m⁄Í? ị„K?Ô⁄ƒ Ị™|?~0?“ƒửã? ⁄Ă›?Ô⁄!ƒK?‹?ʻ„ Ă?~0 “ƒửã?|ỡ‹?‹JQ?|⁄ã?Ô3K? ⁄\„?|⁄›?R‹?|⁄ã?Ô3?‹⁄Í? ‒Í&|M

bế|⁄?Ô⁄ế|?“ềô?|⁄›?ʻã ? ‒ã„ũ‹?~0?“ƒửã?‹⁄\‹⁄?⁄Ĩ‹?“ề?“ềô?|⁄›?|ế|?|⁄ã?Ô3?‹Êĩ‹ “ệƒM?s‒›‹Ê? ỵ?~‑? ‒è‹K?ô ƒ?ʻ„ Ă?ỊÍ'|? ‒ã„ũ‹?Ịƒ? ‒›‹Ê?VTO‹ K? ị„?ʻã ?|š?~ểƒ? ⁄Ỉ‹Ê?“ề PMRRla M?mừã ‚ã‹Ê?Ịž‹Ê?⁄ž?“ề?Wlg”K? ⁄#ƒ?ʃ\‹?ô" ?|⁄ã?Ô3?|⁄ự?|Š‹?ô" ?‹/\K?ʃểƒ

⁄Ỉ‹Ê? ù?“ề?QMUVla M

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ị‹? !|K?~ĩ‹?Ịừ‹?ô" ?⁄ƒửã?1‹ÊK?Ê™ƒ?“ề bus skewM

j⁄ƒ?‹Ê⁄ƒè‹?|1ã? ũ?ʻã ?|ỡ‹?fi⁄ểƒ?flã\‹? Ơô?Ịừ‹? ớ‹?Ịũ? ỵ‹?⁄ƒửã? ỵ|⁄?|2|?‹è‹?“ề ô1|? ⁄ớfi?⁄\„?ô1|?|\›M?ấƒũã?‹ề„? ã3? ⁄ã"|? ề›?‹ÊÍ#ƒ? ⁄ƒừ ?Ôừ?ʻã ?‚ế|?Ịÿ‹⁄?ô1| ‹ề›?“ề? ⁄ãị‹?“'ƒ?⁄Ĩ‹M

Bảng 5.1.?fƒế? ‒ÿ?|*\?ô" ? !? ⁄Ỉ‹Ê? !? ⁄#ƒ?ʃ\‹

Ký hiệu Tham sỉ M in M ax

TAD s⁄#ƒ?ʃ\‹? ‒ụ?|*\? ỵ‹?⁄ƒửã?Ịÿ\?|⁄ự PPO

TM L s⁄#ƒ?ʃ\‹?Ịÿ\?|⁄ự? ‹?Ịÿ‹⁄? ‒Í&|? ỵ‹?⁄ƒửã MREQ UO

TM s⁄#ƒ?ʃ\‹? ‒ụ?|*\ MREQ? ›? &ƒ? Í#‹?‚ã!‹Ê?|*\ ỵ‹?⁄ƒửã?Ịž‹Ê?⁄ž?sP

WT

TRL s⁄#ƒ?ʃ\‹? ‒ụ?|*\ RD? ›? &ƒ? Í#‹?‚ã!‹Ê?|*\? ỵ‹⁄ƒửã?Ịž‹Ê?⁄ž?sP ⁄ƒửã?Ịž‹Ê?⁄ž?sP

WT

TDS s⁄#ƒ?ʃ\‹? ⁄ƒừ ?“ịfi?~0?“ƒửã? ‒Í&|? Í#‹?‚ã!‹Ê?|*\ỵ‹?⁄ƒửã?Ịž‹Ê?⁄ž?sR ỵ‹?⁄ƒửã?Ịž‹Ê?⁄ž?sR

TO

TM H s⁄#ƒ?ʃ\‹? ‒ụ?|*\ MREQ? ›? &ƒ? Í#‹?‚ã!‹Ê?|*\ ỵ‹?⁄ƒửã?Ịž‹Ê?⁄ž?sR

WT

TRH s⁄#ƒ?ʃ\‹? ‒ụ?|*\RD? ›? &ƒ? Í#‹?‚ã!‹Ê?|*\? ỵ‹⁄ƒửã?Ịž‹Ê?⁄ž?sR ⁄ƒửã?Ịž‹Ê?⁄ž?sR

o⁄› ›|›fi„\ʻ“Ă SQ

TDH s⁄#ƒ?ʃ\‹?“Íã? ‒0?~0?“ƒửã? .?“,|?Ịể›? ỵ‹?⁄ƒửã RD O

hhMRM?aã ?Ô⁄Ỉ‹Ê?Ịž‹Ê?ʻ"?G\ „‹|⁄‒›‹›ã ?ʻã HM

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QM SSYNỊÍ'|?Ịơ ? ỵ|⁄?|2|?Ịú?Ịếfi?“ệƒ? ỵ‹?⁄ƒửãMSYN

RM MSYNỊÍ'|?Ịể›?Ịú?Ịếfi?“ệƒ? ỵ‹?⁄ƒửã SSYN

SM SSYN?ỊÍ'|?Ịể›?Ịú?Ịếfi?“ệƒ? ỵ‹?⁄ƒửã MSYN? ⁄ề‹⁄?Ô⁄Ỉ‹Ê? ỵ|⁄?|2|M

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