{"id":1755,"date":"2026-03-31T07:10:45","date_gmt":"2026-03-31T07:10:45","guid":{"rendered":"https:\/\/www.tech-posts.com\/vi\/timing-diagram-qa-questions-guide\/"},"modified":"2026-03-31T07:10:45","modified_gmt":"2026-03-31T07:10:45","slug":"timing-diagram-qa-questions-guide","status":"publish","type":"post","link":"https:\/\/www.tech-posts.com\/vi\/timing-diagram-qa-questions-guide\/","title":{"rendered":"S\u01a1 \u0111\u1ed3 th\u1eddi gian Q&A: Tr\u1ea3 l\u1eddi nh\u1eefng c\u00e2u h\u1ecfi quan tr\u1ecdng nh\u1ea5t c\u1ee7a b\u1ea1n"},"content":{"rendered":"

Trong th\u1ebf gi\u1edbi \u0111i\u1ec7n t\u1eed s\u1ed1 v\u00e0 k\u1ef9 thu\u1eadt ph\u1ea7n c\u1ee9ng, vi\u1ec7c giao ti\u1ebfp gi\u1eefa c\u00e1c th\u00e0nh ph\u1ea7n ph\u1ee5 thu\u1ed9c v\u00e0o s\u1ef1 ph\u1ed1i h\u1ee3p ch\u00ednh x\u00e1c. Kh\u00f4ng c\u00f3 s\u1ef1 hi\u1ec3u r\u00f5 r\u00f5 r\u00e0ng v\u1ec1 th\u1eddi \u0111i\u1ec3m c\u00e1c t\u00edn hi\u1ec7u thay \u0111\u1ed5i tr\u1ea1ng th\u00e1i, h\u1ec7 th\u1ed1ng s\u1ebd th\u1ea5t b\u1ea1i. S\u01a1 \u0111\u1ed3 th\u1eddi gian \u0111\u00f3ng vai tr\u00f2 nh\u01b0 b\u1ea3n v\u1ebd thi\u1ebft k\u1ebf cho s\u1ef1 ph\u1ed1i h\u1ee3p n\u00e0y. N\u00f3 tr\u1ef1c quan h\u00f3a m\u1ed1i quan h\u1ec7 gi\u1eefa c\u00e1c t\u00edn hi\u1ec7u theo th\u1eddi gian, ti\u1ebft l\u1ed9 d\u1eef li\u1ec7u c\u00f3 h\u1ee3p l\u1ec7, \u1ed5n \u0111\u1ecbnh v\u00e0 s\u1eb5n s\u00e0ng \u0111\u1ec3 x\u1eed l\u00fd hay kh\u00f4ng. H\u01b0\u1edbng d\u1eabn n\u00e0y gi\u1ea3i quy\u1ebft nh\u1eefng c\u00e2u h\u1ecfi c\u01a1 b\u1ea3n m\u00e0 c\u00e1c k\u1ef9 s\u01b0 v\u00e0 sinh vi\u00ean th\u01b0\u1eddng g\u1eb7p khi ph\u00e2n t\u00edch nh\u1eefng c\u00f4ng c\u1ee5 tr\u1ef1c quan quan tr\u1ecdng n\u00e0y.<\/p>\n

D\u00f9 b\u1ea1n \u0111ang thi\u1ebft k\u1ebf giao di\u1ec7n vi \u0111i\u1ec1u khi\u1ec3n, g\u1ee1 l\u1ed7i giao th\u1ee9c truy\u1ec1n th\u00f4ng hay nghi\u00ean c\u1ee9u logic s\u1ed1, vi\u1ec7c hi\u1ec3u r\u00f5 c\u00e1c kh\u00eda c\u1ea1nh th\u1eddi gian trong thi\u1ebft k\u1ebf c\u1ee7a b\u1ea1n l\u00e0 \u0111i\u1ec1u kh\u00f4ng th\u1ec3 b\u1ecf qua. B\u00e0i vi\u1ebft n\u00e0y kh\u00e1m ph\u00e1 c\u1ea5u t\u1ea1o c\u1ee7a s\u01a1 \u0111\u1ed3 th\u1eddi gian, gi\u1ea3i th\u00edch c\u00e1c tham s\u1ed1 quan tr\u1ecdng v\u00e0 tr\u1ea3 l\u1eddi nh\u1eefng c\u00e2u h\u1ecfi ph\u1ed5 bi\u1ebfn v\u1ec1 \u0111\u1ed9 to\u00e0n v\u1eb9n t\u00edn hi\u1ec7u v\u00e0 \u0111\u1ed3ng b\u1ed9 h\u00f3a.<\/p>\n

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\"Whimsical<\/figure>\n<\/div>\n

Ch\u00ednh x\u00e1c th\u00ec s\u01a1 \u0111\u1ed3 th\u1eddi gian l\u00e0 g\u00ec? \ud83d\udcca<\/h2>\n

S\u01a1 \u0111\u1ed3 th\u1eddi gian l\u00e0 m\u1ed9t bi\u1ec3u di\u1ec5n \u0111\u1ed3 h\u1ecda cho tr\u00ecnh t\u1ef1 c\u00e1c s\u1ef1 ki\u1ec7n trong m\u1ed9t h\u1ec7 th\u1ed1ng. N\u00f3 v\u1ebd m\u1ee9c t\u00edn hi\u1ec7u theo tr\u1ee5c th\u1eddi gian n\u1eb1m ngang. Kh\u00e1c v\u1edbi s\u01a1 \u0111\u1ed3 logic, th\u1ec3 hi\u1ec7n k\u1ebft n\u1ed1i, s\u01a1 \u0111\u1ed3 th\u1eddi gian th\u1ec3 hi\u1ec7n h\u00e0nh vi. N\u00f3 cho ph\u00e9p b\u1ea1n th\u1ea5y \u0111\u01b0\u1ee3c m\u1ed9t t\u00edn hi\u1ec7u chuy\u1ec3n t\u1eeb th\u1ea5p l\u00ean cao hay t\u1eeb cao xu\u1ed1ng th\u1ea5p tr\u01b0\u1edbc hay sau t\u00edn hi\u1ec7u kh\u00e1c. B\u1ed1i c\u1ea3nh tr\u1ef1c quan n\u00e0y l\u00e0 \u0111i\u1ec1u c\u1ea7n thi\u1ebft \u0111\u1ec3 x\u00e1c minh r\u1eb1ng b\u1ed9 nh\u1eadn c\u00f3 \u0111\u1ee7 th\u1eddi gian \u0111\u1ec3 \u0111\u1ecdc d\u1eef li\u1ec7u tr\u01b0\u1edbc khi c\u1ea1nh \u0111\u1ed3ng h\u1ed3 ti\u1ebfp theo \u0111\u1ebfn.<\/p>\n

Nh\u1eefng \u0111\u1eb7c \u0111i\u1ec3m ch\u00ednh bao g\u1ed3m:<\/p>\n

    \n
  • Tr\u1ee5c th\u1eddi gian:<\/strong>Th\u01b0\u1eddng ch\u1ea1y theo chi\u1ec1u ngang t\u1eeb tr\u00e1i sang ph\u1ea3i.<\/li>\n
  • C\u00e1c \u0111\u01b0\u1eddng t\u00edn hi\u1ec7u:<\/strong>C\u00e1c \u0111\u01b0\u1eddng n\u1eb1m ngang bi\u1ec3u di\u1ec5n t\u1eebng d\u00e2y d\u1eabn ho\u1eb7c bus d\u1eef li\u1ec7u ri\u00eang bi\u1ec7t.<\/li>\n
  • M\u1ee9c logic:<\/strong>Tr\u1ea1ng th\u00e1i Cao (1) v\u00e0 Th\u1ea5p (0) \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n b\u1eb1ng c\u00e1c m\u1ee9c \u0111i\u1ec7n \u00e1p ri\u00eang bi\u1ec7t.<\/li>\n
  • C\u1ea1nh:<\/strong>C\u00e1c \u0111\u01b0\u1eddng th\u1eb3ng \u0111\u1ee9ng ch\u1ec9 s\u1ef1 chuy\u1ec3n \u0111\u1ed5i t\u1eeb tr\u1ea1ng th\u00e1i n\u00e0y sang tr\u1ea1ng th\u00e1i kh\u00e1c.<\/li>\n<\/ul>\n

    C\u00e1c th\u00e0nh ph\u1ea7n ch\u00ednh c\u1ee7a s\u01a1 \u0111\u1ed3 th\u1eddi gian \ud83e\udde9<\/h2>\n

    \u0110\u1ec3 \u0111\u1ecdc c\u00e1c s\u01a1 \u0111\u1ed3 n\u00e0y m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3, b\u1ea1n ph\u1ea3i x\u00e1c \u0111\u1ecbnh c\u00e1c th\u00e0nh ph\u1ea7n ti\u00eau chu\u1ea9n t\u1ea1o n\u00ean d\u1ea1ng s\u00f3ng. M\u1ed7i th\u00e0nh ph\u1ea7n \u0111\u1ec1u \u0111\u00f3ng vai tr\u00f2 c\u1ee5 th\u1ec3 trong vi\u1ec7c \u0111\u1ed3ng b\u1ed9 h\u00f3a h\u1ec7 th\u1ed1ng.<\/p>\n\n\n\n\n\n\n\n
    Th\u00e0nh ph\u1ea7n<\/th>\nM\u00f4 t\u1ea3<\/th>\nCh\u1ec9 b\u00e1o tr\u1ef1c quan<\/th>\n<\/tr>\n
    T\u00edn hi\u1ec7u \u0111\u1ed3ng h\u1ed3<\/td>\nCung c\u1ea5p nh\u1ecbp \u0111\u1eadp cho h\u1ec7 th\u1ed1ng. C\u00e1c t\u00edn hi\u1ec7u kh\u00e1c th\u01b0\u1eddng \u0111\u01b0\u1ee3c l\u1ea5y m\u1eabu d\u1ef1a tr\u00ean t\u00edn hi\u1ec7u n\u00e0y.<\/td>\nM\u1eabu s\u00f3ng vu\u00f4ng \u0111\u1ec1u \u0111\u1eb7n<\/td>\n<\/tr>\n
    T\u00edn hi\u1ec7u d\u1eef li\u1ec7u<\/td>\nV\u1eadn chuy\u1ec3n th\u00f4ng tin th\u1ef1c s\u1ef1 \u0111ang \u0111\u01b0\u1ee3c truy\u1ec1n \u0111i.<\/td>\nC\u00e1c chuy\u1ec3n ti\u1ebfp kh\u00f4ng \u0111\u1ec1u d\u1ef1a tr\u00ean \u0111\u1ea7u v\u00e0o<\/td>\n<\/tr>\n
    T\u00edn hi\u1ec7u \u0111i\u1ec1u khi\u1ec3n<\/td>\nQu\u1ea3n l\u00fd lu\u1ed3ng d\u1eef li\u1ec7u (v\u00ed d\u1ee5: K\u00edch ho\u1ea1t, ch\u1ecdn chip, ghi).<\/td>\nXung ho\u1ea1t \u0111\u1ed9ng cao ho\u1eb7c ho\u1ea1t \u0111\u1ed9ng th\u1ea5p<\/td>\n<\/tr>\n
    Th\u1eddi gian thi\u1ebft l\u1eadp<\/td>\nKho\u1ea3ng th\u1eddi gian d\u1eef li\u1ec7u ph\u1ea3i \u1ed5n \u0111\u1ecbnh tr\u01b0\u1edbc khi c\u00f3 c\u1ea1nh \u0111\u1ed3ng h\u1ed3.<\/td>\nKho\u1ea3ng c\u00e1ch ngang tr\u01b0\u1edbc c\u1ea1nh<\/td>\n<\/tr>\n
    Th\u1eddi gian gi\u1eef<\/td>\nTh\u1eddi gian d\u1eef li\u1ec7u ph\u1ea3i duy tr\u00ec \u1ed5n \u0111\u1ecbnh sau m\u1ed9t c\u1ea1nh t\u00edn hi\u1ec7u \u0111\u1ed3ng h\u1ed3.<\/td>\nKho\u1ea3ng c\u00e1ch ngang sau c\u1ea1nh<\/td>\n<\/tr>\n<\/table>\n

    Hi\u1ec3u c\u00e1c tham s\u1ed1 th\u1eddi gian quan tr\u1ecdng \u2699\ufe0f<\/h2>\n

    C\u00e1c tham s\u1ed1 th\u1eddi gian x\u00e1c \u0111\u1ecbnh c\u00e1c gi\u1edbi h\u1ea1n m\u00e0 trong \u0111\u00f3 m\u1ea1ch s\u1ed1 ho\u1ea1t \u0111\u1ed9ng \u0111\u00fang c\u00e1ch. Vi ph\u1ea1m c\u00e1c tham s\u1ed1 n\u00e0y th\u01b0\u1eddng d\u1eabn \u0111\u1ebfn h\u00e0nh vi kh\u00f4ng th\u1ec3 d\u1ef1 \u0111o\u00e1n \u0111\u01b0\u1ee3c. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 \u0111\u1ecbnh ngh\u0129a v\u00e0 h\u1ec7 qu\u1ea3 c\u1ee7a c\u00e1c ch\u1ec9 s\u1ed1 quan tr\u1ecdng nh\u1ea5t.<\/p>\n

    1. Th\u1eddi gian thi\u1ebft l\u1eadp \u23f3<\/h3>\n

    Th\u1eddi gian thi\u1ebft l\u1eadp l\u00e0 kho\u1ea3ng th\u1eddi gian t\u1ed1i thi\u1ec3u m\u00e0 t\u00edn hi\u1ec7u d\u1eef li\u1ec7u ph\u1ea3i \u0111\u01b0\u1ee3c gi\u1eef \u1ed5n \u0111\u1ecbnh tr\u01b0\u1edbc c\u1ea1nh k\u00edch ho\u1ea1t c\u1ee7a t\u00edn hi\u1ec7u \u0111\u1ed3ng h\u1ed3. N\u1ebfu d\u1eef li\u1ec7u thay \u0111\u1ed5i qu\u00e1 g\u1ea7n c\u1ea1nh \u0111\u1ed3ng h\u1ed3, flip-flop c\u00f3 th\u1ec3 kh\u00f4ng ghi nh\u1eadn gi\u00e1 tr\u1ecb \u0111\u00fang. \u0110\u00e2y th\u01b0\u1eddng l\u00e0 r\u00e0ng bu\u1ed9c quan tr\u1ecdng nh\u1ea5t trong c\u00e1c thi\u1ebft k\u1ebf t\u1ed1c \u0111\u1ed9 cao v\u00ec n\u00f3 x\u00e1c \u0111\u1ecbnh t\u1ea7n s\u1ed1 ho\u1ea1t \u0111\u1ed9ng t\u1ed1i \u0111a.<\/p>\n

    2. Th\u1eddi gian gi\u1eef \u23f3<\/h3>\n

    Th\u1eddi gian gi\u1eef l\u00e0 kho\u1ea3ng th\u1eddi gian t\u1ed1i thi\u1ec3u m\u00e0 t\u00edn hi\u1ec7u d\u1eef li\u1ec7u ph\u1ea3i \u0111\u01b0\u1ee3c gi\u1eef \u1ed5n \u0111\u1ecbnh sau c\u1ea1nh k\u00edch ho\u1ea1t c\u1ee7a t\u00edn hi\u1ec7u \u0111\u1ed3ng h\u1ed3. Kh\u00e1c v\u1edbi th\u1eddi gian thi\u1ebft l\u1eadp, th\u1eddi gian gi\u1eef th\u01b0\u1eddng \u0111\u1ed9c l\u1eadp v\u1edbi t\u1ea7n s\u1ed1 \u0111\u1ed3ng h\u1ed3. N\u00f3 ph\u1ee5 thu\u1ed9c v\u00e0o \u0111\u1ed9 tr\u1ec5 n\u1ed9i b\u1ed9 c\u1ee7a flip-flop v\u00e0 \u0111\u1ed9 tr\u1ec5 lan truy\u1ec1n b\u00ean ngo\u00e0i c\u1ee7a \u0111\u01b0\u1eddng d\u1eabn d\u1eef li\u1ec7u.<\/p>\n

    3. \u0110\u1ed9 tr\u1ec5 lan truy\u1ec1n \u23f3<\/h3>\n

    \u0110\u00e2y l\u00e0 kho\u1ea3ng th\u1eddi gian \u0111\u1ec3 m\u1ed9t t\u00edn hi\u1ec7u \u0111i t\u1eeb \u0111\u1ea7u v\u00e0o c\u1ee7a m\u1ed9t th\u00e0nh ph\u1ea7n \u0111\u1ebfn \u0111\u1ea7u ra c\u1ee7a n\u00f3. Kho\u1ea3ng th\u1eddi gian n\u00e0y thay \u0111\u1ed5i t\u00f9y theo nhi\u1ec7t \u0111\u1ed9, \u0111i\u1ec7n \u00e1p v\u00e0 \u0111\u1ed9 sai l\u1ec7ch s\u1ea3n xu\u1ea5t. Trong s\u01a1 \u0111\u1ed3 th\u1eddi gian, \u0111i\u1ec1u n\u00e0y th\u1ec3 hi\u1ec7n nh\u01b0 \u0111\u1ed9 tr\u1ec5 gi\u1eefa m\u1ed9t thay \u0111\u1ed5i \u1edf t\u00edn hi\u1ec7u n\u00e0y v\u00e0 thay \u0111\u1ed5i t\u01b0\u01a1ng \u1ee9ng \u1edf t\u00edn hi\u1ec7u kh\u00e1c.<\/p>\n

    4. Chu k\u1ef3 \u0111\u1ed3ng h\u1ed3 v\u00e0 t\u1ea7n s\u1ed1 \u23f3<\/h3>\n

    Chu k\u1ef3 \u0111\u1ed3ng h\u1ed3 l\u00e0 th\u1eddi gian c\u1ee7a m\u1ed9t chu k\u1ef3 ho\u00e0n ch\u1ec9nh c\u1ee7a t\u00edn hi\u1ec7u \u0111\u1ed3ng h\u1ed3. T\u1ea7n s\u1ed1 l\u00e0 ngh\u1ecbch \u0111\u1ea3o c\u1ee7a chu k\u1ef3. Chu k\u1ef3 ng\u1eafn h\u01a1n c\u00f3 ngh\u0129a l\u00e0 t\u1ea7n s\u1ed1 cao h\u01a1n, cho ph\u00e9p x\u1eed l\u00fd nhanh h\u01a1n nh\u01b0ng \u0111\u1ed3ng th\u1eddi thu h\u1eb9p kho\u1ea3ng th\u1eddi gian \u1ed5n \u0111\u1ecbnh t\u00edn hi\u1ec7u.<\/p>\n

    C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p \u2753<\/h2>\n

    C\u00e1c k\u1ef9 s\u01b0 th\u01b0\u1eddng g\u1eb7p ph\u1ea3i nh\u1eefng t\u00ecnh hu\u1ed1ng c\u1ee5 th\u1ec3 g\u00e2y nh\u1ea7m l\u1eabn. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 nh\u1eefng c\u00e2u tr\u1ea3 l\u1eddi chi ti\u1ebft cho nh\u1eefng c\u00e2u h\u1ecfi c\u1ea5p b\u00e1ch nh\u1ea5t li\u00ean quan \u0111\u1ebfn ph\u00e2n t\u00edch th\u1eddi gian.<\/p>\n

    C\u00e2u h\u1ecfi: \u0110i\u1ec1u g\u00ec x\u1ea3y ra n\u1ebfu vi ph\u1ea1m th\u1eddi gian thi\u1ebft l\u1eadp? \ud83d\uded1<\/h3>\n

    Khi y\u00eau c\u1ea7u th\u1eddi gian thi\u1ebft l\u1eadp kh\u00f4ng \u0111\u01b0\u1ee3c \u0111\u00e1p \u1ee9ng, flip-flop s\u1ebd chuy\u1ec3n sang tr\u1ea1ng th\u00e1i \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 t\u00ecnh tr\u1ea1ng b\u1ea5t \u1ed5n<\/strong>. \u1ede tr\u1ea1ng th\u00e1i n\u00e0y, \u0111\u1ea7u ra kh\u00f4ng \u1ed5n \u0111\u1ecbnh ngay l\u1eadp t\u1ee9c v\u1ec1 m\u1ee9c logic cao ho\u1eb7c th\u1ea5p h\u1ee3p l\u1ec7. Thay v\u00e0o \u0111\u00f3, n\u00f3 c\u00f3 th\u1ec3 dao \u0111\u1ed9ng ho\u1eb7c duy tr\u00ec \u1edf m\u1ee9c \u0111i\u1ec7n \u00e1p trung gian trong m\u1ed9t kho\u1ea3ng th\u1eddi gian kh\u00f4ng th\u1ec3 d\u1ef1 \u0111o\u00e1n \u0111\u01b0\u1ee3c. \u0110i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 khi\u1ebfn logic ph\u00eda sau \u0111\u1ecdc ph\u1ea3i gi\u00e1 tr\u1ecb b\u1ecb l\u1ed7i, d\u1eabn \u0111\u1ebfn l\u1ed7i h\u1ec7 th\u1ed1ng ho\u1eb7c treo m\u00e1y. Trong c\u00e1c tr\u01b0\u1eddng h\u1ee3p nghi\u00eam tr\u1ecdng, t\u00ecnh tr\u1ea1ng b\u1ea5t \u1ed5n c\u00f3 th\u1ec3 lan truy\u1ec1n qua to\u00e0n b\u1ed9 m\u1ea1ch, g\u00e2y ra s\u1ef1 c\u1ed1 ch\u1ee9c n\u0103ng m\u00e0 r\u1ea5t kh\u00f3 \u0111\u1ec3 g\u1ee1 l\u1ed7i.<\/p>\n

    C\u00e2u h\u1ecfi: L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 x\u1eed l\u00fd \u0111\u1ed9 l\u1ec7ch \u0111\u1ed3ng h\u1ed3? \ud83d\udd04<\/h3>\n

    \u0110\u1ed9 l\u1ec7ch \u0111\u1ed3ng h\u1ed3 x\u1ea3y ra khi t\u00edn hi\u1ec7u \u0111\u1ed3ng h\u1ed3 \u0111\u1ebfn c\u00e1c th\u00e0nh ph\u1ea7n kh\u00e1c nhau v\u00e0o nh\u1eefng th\u1eddi \u0111i\u1ec3m kh\u00e1c nhau. \u0110i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 x\u1ea3y ra do \u0111\u1ed9 d\u00e0i \u0111\u01b0\u1eddng d\u1eabn kh\u00e1c nhau ho\u1eb7c s\u1ef1 kh\u00e1c bi\u1ec7t v\u1ec1 t\u1ea3i. \u0110\u1ec3 qu\u1ea3n l\u00fd \u0111\u1ed9 l\u1ec7ch:<\/p>\n

      \n
    • C\u00e2n b\u1eb1ng \u0111\u01b0\u1eddng d\u1eabn:<\/strong> \u0110\u1ea3m b\u1ea3o c\u00e1c \u0111\u01b0\u1eddng d\u1eabn \u0111\u1ed3ng h\u1ed3 \u0111\u01b0\u1ee3c b\u1ed1 tr\u00ed v\u1edbi \u0111\u1ed9 d\u00e0i v\u00e0 chi\u1ec1u r\u1ed9ng t\u01b0\u01a1ng \u0111\u01b0\u01a1ng nhau.<\/li>\n
    • S\u1eed d\u1ee5ng b\u1ed9 \u0111\u1ec7m:<\/strong> S\u1eed d\u1ee5ng b\u1ed9 \u0111\u1ec7m \u0111\u1ed3ng h\u1ed3 \u0111\u1ec3 cung c\u1ea5p \u0111i\u1ec7n cho nhi\u1ec1u t\u1ea3i m\u1ed9t c\u00e1ch \u0111\u1ec1u \u0111\u1eb7n.<\/li>\n
    • Kho\u1ea3ng an to\u00e0n v\u1ec1 th\u1eddi gian:<\/strong> Thi\u1ebft k\u1ebf h\u1ec7 th\u1ed1ng v\u1edbi \u0111\u1ee7 kho\u1ea3ng tr\u1ed1ng trong th\u1eddi gian thi\u1ebft l\u1eadp v\u00e0 gi\u1eef \u0111\u1ec3 h\u1ea5p th\u1ee5 c\u00e1c bi\u1ebfn \u0111\u1ed9ng nh\u1ecf c\u1ee7a \u0111\u1ed9 l\u1ec7ch \u0111\u1ed3ng h\u1ed3.<\/li>\n<\/ul>\n

      C\u00e2u h\u1ecfi: S\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa th\u1eddi gian \u0111\u1ed3ng b\u1ed9 v\u00e0 th\u1eddi gian b\u1ea5t \u0111\u1ed3ng b\u1ed9 l\u00e0 g\u00ec? \u2696\ufe0f<\/h3>\n

      Trong \u0111\u1ed3ng b\u1ed9<\/strong> h\u1ec7 th\u1ed1ng, t\u1ea5t c\u1ea3 c\u00e1c thao t\u00e1c \u0111\u01b0\u1ee3c \u0111i\u1ec1u ph\u1ed1i b\u1edfi m\u1ed9t t\u00edn hi\u1ec7u \u0111\u1ed3ng h\u1ed3 duy nh\u1ea5t. C\u00e1c s\u01a1 \u0111\u1ed3 th\u1eddi gian cho c\u00e1c h\u1ec7 th\u1ed1ng n\u00e0y th\u1ec3 hi\u1ec7n c\u00e1c c\u1ea1nh \u0111\u1ed3ng h\u1ed3 \u0111\u1ec1u \u0111\u1eb7n, l\u1eb7p l\u1ea1i. Trong kh\u00f4ng \u0111\u1ed3ng b\u1ed9<\/strong> h\u1ec7 th\u1ed1ng, c\u00e1c t\u00edn hi\u1ec7u k\u00edch ho\u1ea1t c\u00e1c h\u00e0nh \u0111\u1ed9ng m\u00e0 kh\u00f4ng c\u1ea7n \u0111\u1ed3ng h\u1ed3 to\u00e0n c\u1ee5c. C\u00e1c s\u01a1 \u0111\u1ed3 th\u1eddi gian cho c\u00e1c h\u1ec7 th\u1ed1ng n\u00e0y th\u1ec3 hi\u1ec7n c\u00e1c chuy\u1ec3n \u0111\u1ed5i \u0111\u01b0\u1ee3c k\u00edch ho\u1ea1t b\u1edfi s\u1ef1 ki\u1ec7n, th\u01b0\u1eddng c\u00f3 s\u1ef1 bi\u1ebfn thi\u00ean l\u1edbn h\u01a1n trong kho\u1ea3ng th\u1eddi gian gi\u1eefa c\u00e1c t\u00edn hi\u1ec7u. C\u00e1c thi\u1ebft k\u1ebf kh\u00f4ng \u0111\u1ed3ng b\u1ed9 kh\u00f3 ph\u00e2n t\u00edch h\u01a1n nh\u01b0ng c\u00f3 th\u1ec3 hi\u1ec7u qu\u1ea3 h\u01a1n v\u1ec1 n\u0103ng l\u01b0\u1ee3ng trong m\u1ed9t s\u1ed1 \u1ee9ng d\u1ee5ng ti\u00eau th\u1ee5 n\u0103ng l\u01b0\u1ee3ng th\u1ea5p c\u1ee5 th\u1ec3.<\/p>\n

      C\u00e2u h\u1ecfi: Jitter \u1ea3nh h\u01b0\u1edfng nh\u01b0 th\u1ebf n\u00e0o \u0111\u1ebfn s\u01a1 \u0111\u1ed3 th\u1eddi gian? \ud83d\udcc9<\/h3>\n

      Jitter l\u00e0 s\u1ef1 bi\u1ebfn thi\u00ean ng\u1eafn h\u1ea1n c\u1ee7a m\u1ed9t t\u00edn hi\u1ec7u so v\u1edbi v\u1ecb tr\u00ed l\u00fd t\u01b0\u1edfng theo th\u1eddi gian. Trong s\u01a1 \u0111\u1ed3 th\u1eddi gian, \u0111i\u1ec1u n\u00e0y th\u1ec3 hi\u1ec7n d\u01b0\u1edbi d\u1ea1ng c\u00e1c c\u1ea1nh t\u00edn hi\u1ec7u \u0111\u1ed3ng h\u1ed3 xu\u1ea5t hi\u1ec7n h\u01a1i s\u1edbm ho\u1eb7c h\u01a1i mu\u1ed9n so v\u1edbi v\u1ecb tr\u00ed \u0111\u00fang. Jitter qu\u00e1 m\u1ee9c l\u00e0m gi\u1ea3m c\u1eeda s\u1ed5 hi\u1ec7u qu\u1ea3 \u0111\u1ec3 thu th\u1eadp d\u1eef li\u1ec7u. N\u00f3 th\u1ef1c s\u1ef1 l\u00e0m thu nh\u1ecf kho\u1ea3ng c\u00e1ch thi\u1ebft l\u1eadp v\u00e0 gi\u1eef, l\u00e0m t\u0103ng nguy c\u01a1 vi ph\u1ea1m th\u1eddi gian. C\u00e1c giao di\u1ec7n t\u1ed1c \u0111\u1ed9 cao y\u00eau c\u1ea7u ki\u1ec3m so\u00e1t jitter nghi\u00eam ng\u1eb7t \u0111\u1ec3 duy tr\u00ec \u0111\u1ed9 to\u00e0n v\u1eb9n d\u1eef li\u1ec7u.<\/p>\n

      C\u00e2u h\u1ecfi: T\u00f4i c\u00f3 th\u1ec3 \u0111\u1ecdc s\u01a1 \u0111\u1ed3 th\u1eddi gian m\u00e0 kh\u00f4ng c\u1ea7n \u0111\u1ed3ng h\u1ed3 kh\u00f4ng? \ud83d\udd75\ufe0f<\/h3>\n

      C\u00f3, nh\u01b0ng \u0111i\u1ec1u \u0111\u00f3 \u0111\u00f2i h\u1ecfi m\u1ed9t c\u00e1ch ti\u1ebfp c\u1eadn kh\u00e1c. C\u00e1c giao th\u1ee9c kh\u00f4ng \u0111\u1ed3ng b\u1ed9 nh\u01b0 I2C ho\u1eb7c UART kh\u00f4ng lu\u00f4n s\u1eed d\u1ee5ng \u0111\u01b0\u1eddng \u0111\u1ed3ng h\u1ed3 chung. Thay v\u00e0o \u0111\u00f3, ch\u00fang ph\u1ee5 thu\u1ed9c v\u00e0o t\u1ed1c \u0111\u1ed9 truy\u1ec1n (baud rate) \u0111\u00e3 \u0111\u1ecbnh tr\u01b0\u1edbc ho\u1eb7c c\u00e1c t\u00edn hi\u1ec7u trao \u0111\u1ed5i. Trong c\u00e1c s\u01a1 \u0111\u1ed3 n\u00e0y, b\u1ea1n ph\u1ea3i quan s\u00e1t \u0111\u1ed9 r\u1ed9ng xung v\u00e0 kho\u1ea3ng th\u1eddi gian gi\u1eefa c\u00e1c chuy\u1ec3n \u0111\u1ed5i \u0111\u1ec3 suy ra t\u1ed1c \u0111\u1ed9 d\u1eef li\u1ec7u. V\u00ed d\u1ee5, trong UART, th\u1eddi gian k\u00e9o d\u00e0i c\u1ee7a bit b\u1eaft \u0111\u1ea7u x\u00e1c \u0111\u1ecbnh th\u1eddi gian cho c\u00e1c bit d\u1eef li\u1ec7u ti\u1ebfp theo.<\/p>\n

      \u0110\u1ecdc v\u00e0 di\u1ec5n gi\u1ea3i c\u00e1c d\u1ea1ng s\u00f3ng \ud83d\udd0d<\/h2>\n

      Vi\u1ec7c di\u1ec5n gi\u1ea3i m\u1ed9t s\u01a1 \u0111\u1ed3 th\u1eddi gian \u0111\u00f2i h\u1ecfi c\u00e1ch ti\u1ebfp c\u1eadn c\u00f3 h\u1ec7 th\u1ed1ng. Vi\u1ec7c qu\u00e9t ng\u1eabu nhi\u00ean c\u00e1c \u0111\u01b0\u1eddng th\u01b0\u1eddng d\u1eabn \u0111\u1ebfn b\u1ecf s\u00f3t chi ti\u1ebft. H\u00e3y tu\u00e2n theo quy tr\u00ecnh n\u00e0y \u0111\u1ec3 ph\u00e2n t\u00edch ch\u00ednh x\u00e1c.<\/p>\n

        \n
      • X\u00e1c \u0111\u1ecbnh \u0111i\u1ec3m tham chi\u1ebfu:<\/strong> T\u00ecm t\u00edn hi\u1ec7u \u0111\u1ed3ng h\u1ed3 ho\u1eb7c t\u00edn hi\u1ec7u \u0111i\u1ec1u khi\u1ec3n ch\u00ednh. T\u1ea5t c\u1ea3 c\u00e1c th\u1eddi gian kh\u00e1c \u0111\u1ec1u \u0111\u01b0\u1ee3c tham chi\u1ebfu v\u00e0o \u0111i\u1ec3m n\u00e0y.<\/li>\n
      • Ki\u1ec3m tra tr\u1ea1ng th\u00e1i ho\u1ea1t \u0111\u1ed9ng:<\/strong> X\u00e1c \u0111\u1ecbnh xem c\u00e1c t\u00edn hi\u1ec7u l\u00e0 ho\u1ea1t \u0111\u1ed9ng cao hay ho\u1ea1t \u0111\u1ed9ng th\u1ea5p. M\u1ed9t xung th\u1ea5p c\u00f3 th\u1ec3 c\u00f3 ngh\u0129a l\u00e0 \u201ck\u00edch ho\u1ea1t\u201d, trong khi xung cao c\u00f3 ngh\u0129a l\u00e0 \u201cv\u00f4 hi\u1ec7u h\u00f3a\u201d. \u0110i\u1ec1u n\u00e0y th\u01b0\u1eddng \u0111\u01b0\u1ee3c bi\u1ec3u th\u1ecb b\u1eb1ng k\u00fd hi\u1ec7u h\u00ecnh tr\u00f2n tr\u00ean t\u00ean ch\u00e2n trong s\u01a1 \u0111\u1ed3 m\u1ea1ch.<\/li>\n
      • Ph\u00e2n t\u00edch s\u1ef1 \u0111\u1ed3ng b\u1ed9 c\u1ea1nh:<\/strong> Quan s\u00e1t k\u1ef9 n\u01a1i c\u00e1c c\u1ea1nh d\u1eef li\u1ec7u \u0111\u1ed3ng b\u1ed9 v\u1edbi c\u00e1c c\u1ea1nh \u0111\u1ed3ng h\u1ed3. D\u1eef li\u1ec7u n\u00ean thay \u0111\u1ed5i l\u00fd t\u01b0\u1edfng khi \u0111\u1ed3ng h\u1ed3 \u1ed5n \u0111\u1ecbnh (v\u00ed d\u1ee5: giai \u0111o\u1ea1n th\u1ea5p) v\u00e0 \u1ed5n \u0111\u1ecbnh trong su\u1ed1t c\u1ea1nh ho\u1ea1t \u0111\u1ed9ng.<\/li>\n
      • Theo d\u00f5i c\u00e1c m\u1ed1i quan h\u1ec7 ph\u1ee5 thu\u1ed9c:<\/strong> Theo d\u00f5i m\u1ed1i quan h\u1ec7 nh\u00e2n-qu\u1ea3. N\u1ebfu t\u00edn hi\u1ec7u A k\u00edch ho\u1ea1t t\u00edn hi\u1ec7u B, th\u00ec ph\u1ea3i c\u00f3 m\u1ed9t kho\u1ea3ng tr\u1ec5 r\u00f5 r\u00e0ng gi\u1eefa ch\u00fang, t\u01b0\u01a1ng \u1ee9ng v\u1edbi th\u1eddi gian lan truy\u1ec1n.<\/li>\n
      • X\u00e1c minh \u0111\u1ed9 r\u1ed9ng xung:<\/strong> \u0110\u1ea3m b\u1ea3o c\u00e1c xung ho\u1ea1t \u0111\u1ed9ng \u0111\u1ee7 r\u1ed9ng \u0111\u1ec3 th\u00e0nh ph\u1ea7n nh\u1eadn c\u00f3 th\u1ec3 ph\u00e1t hi\u1ec7n \u0111\u01b0\u1ee3c. M\u1ed9t xung qu\u00e1 h\u1eb9p c\u00f3 th\u1ec3 b\u1ecb l\u1ecdc ra nh\u01b0 nhi\u1ec5u.<\/li>\n<\/ul>\n

        Nh\u1eefng sai l\u1ea7m ph\u1ed5 bi\u1ebfn khi di\u1ec5n gi\u1ea3i s\u01a1 \u0111\u1ed3 \u274c<\/h2>\n

        Ngay c\u1ea3 c\u00e1c k\u1ef9 s\u01b0 c\u00f3 kinh nghi\u1ec7m c\u0169ng c\u00f3 th\u1ec3 di\u1ec5n gi\u1ea3i sai s\u01a1 \u0111\u1ed3 n\u1ebfu b\u1ecf qua nh\u1eefng chi ti\u1ebft c\u1ee5 th\u1ec3. H\u00e3y tr\u00e1nh nh\u1eefng sai l\u1ea7m ph\u1ed5 bi\u1ebfn n\u00e0y.<\/p>\n

          \n
        • B\u1ecf qua m\u1ee9c logic:<\/strong> Gi\u1ea3 \u0111\u1ecbnh t\u1ea5t c\u1ea3 c\u00e1c t\u00edn hi\u1ec7u \u0111\u1ec1u ho\u1ea1t \u0111\u1ed9ng cao m\u00e0 kh\u00f4ng ki\u1ec3m ch\u1ee9ng. Lu\u00f4n ki\u1ec3m tra t\u00e0i li\u1ec7u d\u1eef li\u1ec7u ho\u1eb7c s\u01a1 \u0111\u1ed3 m\u1ea1ch.<\/li>\n
        • B\u1ecf qua th\u1eddi gian lan truy\u1ec1n:<\/strong> Gi\u1ea3 \u0111\u1ecbnh t\u00edn hi\u1ec7u thay \u0111\u1ed5i t\u1ee9c th\u00ec. C\u00e1c th\u00e0nh ph\u1ea7n th\u1ef1c t\u1ebf c\u00f3 th\u1eddi gian ph\u1ea3n \u1ee9ng h\u1eefu h\u1ea1n.<\/li>\n
        • \u0110\u1ecdc sai thang th\u1eddi gian:<\/strong> Kh\u00f4ng nh\u1eadn ra \u0111\u01a1n v\u1ecb th\u1eddi gian (nanosecond so v\u1edbi microsecond). M\u1ed9t t\u00edn hi\u1ec7u tr\u00f4ng \u1ed5n \u0111\u1ecbnh khi thu nh\u1ecf ch\u1eadm c\u00f3 th\u1ec3 hi\u1ec3n th\u1ecb l\u1ed7i khi thu nh\u1ecf nhanh.<\/li>\n
        • B\u1ecf qua tr\u1ea1ng th\u00e1i ngu\u1ed3n \u0111i\u1ec7n:<\/strong> S\u01a1 \u0111\u1ed3 th\u1eddi gian th\u01b0\u1eddng thay \u0111\u1ed5i khi thi\u1ebft b\u1ecb chuy\u1ec3n sang ch\u1ebf \u0111\u1ed9 ng\u1ee7. \u0110\u1ea3m b\u1ea3o b\u1ea1n \u0111ang xem chu\u1ed7i th\u1eddi gian ho\u1ea1t \u0111\u1ed9ng.<\/li>\n<\/ul>\n

          Chi\u1ebfn l\u01b0\u1ee3c cho Ph\u00e2n t\u00edch Ch\u00ednh x\u00e1c \ud83d\udee0\ufe0f<\/h2>\n

          \u0110\u1ec3 \u0111\u1ea3m b\u1ea3o ph\u00e2n t\u00edch th\u1eddi gian c\u1ee7a b\u1ea1n \u0111\u01b0\u1ee3c v\u1eefng ch\u1eafc, h\u00e3y \u00e1p d\u1ee5ng nh\u1eefng chi\u1ebfn l\u01b0\u1ee3c n\u00e0y. Nh\u1eefng ph\u01b0\u01a1ng ph\u00e1p n\u00e0y gi\u00fap duy tr\u00ec t\u00ednh nh\u1ea5t qu\u00e1n v\u00e0 gi\u1ea3m thi\u1ec3u kh\u1ea3 n\u0103ng x\u1ea3y ra l\u1ed7i.<\/p>\n

            \n
          • S\u1eed d\u1ee5ng c\u00e1c \u0111\u01b0\u1eddng l\u01b0\u1edbi:<\/strong>\u0110i\u1ec1u ch\u1ec9nh con tr\u1ecf ho\u1eb7c d\u1ea5u \u0111\u00e1nh d\u1ea5u c\u1ee7a b\u1ea1n tr\u00f9ng v\u1edbi c\u00e1c \u0111\u01b0\u1eddng l\u01b0\u1edbi tr\u00ean s\u01a1 \u0111\u1ed3 \u0111\u1ec3 \u0111o kho\u1ea3ng th\u1eddi gian ch\u00ednh x\u00e1c.<\/li>\n
          • T\u00e0i li\u1ec7u c\u00e1c Gi\u1ea3 \u0111\u1ecbnh:<\/strong>Ghi l\u1ea1i t\u1ea7n s\u1ed1 \u0111\u1ed3ng h\u1ed3 \u0111\u01b0\u1ee3c gi\u1ea3 \u0111\u1ecbnh v\u00e0 c\u00e1c m\u1ee9c logic tr\u01b0\u1edbc khi b\u1eaft \u0111\u1ea7u ph\u00e2n t\u00edch. \u0110i\u1ec1u n\u00e0y gi\u00fap tr\u00e1nh nh\u1ea7m l\u1eabn v\u1ec1 sau.<\/li>\n
          • So s\u00e1nh ch\u00e9o:<\/strong>So s\u00e1nh s\u01a1 \u0111\u1ed3 th\u1eddi gian v\u1edbi logic m\u00e1y tr\u1ea1ng th\u00e1i. M\u1ed7i chuy\u1ec3n \u0111\u1ed5i tr\u1ea1ng th\u00e1i \u0111\u1ec1u ph\u1ea3i c\u00f3 m\u1ed9t s\u1ef1 ki\u1ec7n th\u1eddi gian t\u01b0\u01a1ng \u1ee9ng.<\/li>\n
          • M\u00f4 ph\u1ecfng c\u00e1c bi\u1ebfn th\u1ec3:<\/strong>Xem x\u00e9t c\u00e1c t\u00ecnh hu\u1ed1ng x\u1ea5u nh\u1ea5t. \u0110i\u1ec1u g\u00ec x\u1ea3y ra n\u1ebfu nhi\u1ec7t \u0111\u1ed9 t\u0103ng v\u00e0 \u0111\u1ed9 tr\u1ec5 t\u0103ng? \u0110i\u1ec1u g\u00ec x\u1ea3y ra n\u1ebfu \u0111i\u1ec7n \u00e1p gi\u1ea3m v\u00e0 \u0111\u1ed9 m\u1ea1nh \u0111i\u1ec1u khi\u1ec3n gi\u1ea3m?<\/li>\n
          • T\u1eadp trung v\u00e0o C\u00e1c \u0110\u01b0\u1eddng D\u1eabn Quan Tr\u1ecdng:<\/strong>X\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1eddng \u0111i d\u00e0i nh\u1ea5t trong logic c\u1ee7a b\u1ea1n. \u0110\u01b0\u1eddng \u0111i n\u00e0y x\u00e1c \u0111\u1ecbnh t\u1ed1c \u0111\u1ed9 \u0111\u1ed3ng h\u1ed3 t\u1ed1i \u0111a c\u1ee7a h\u1ec7 th\u1ed1ng. \u01afu ti\u00ean ph\u00e2n t\u00edch th\u1eddi gian cho nh\u1eefng tuy\u1ebfn \u0111\u01b0\u1eddng c\u1ee5 th\u1ec3 n\u00e0y.<\/li>\n<\/ul>\n

            T\u00e1c \u0111\u1ed9ng c\u1ee7a Vi ph\u1ea1m Th\u1eddi gian \u26a0\ufe0f<\/h2>\n

            Hi\u1ec3u r\u00f5 l\u00fd do t\u1ea1i sao th\u1eddi gian l\u1ea1i quan tr\u1ecdng l\u00e0 \u0111i\u1ec1u then ch\u1ed1t. Khi x\u1ea3y ra vi ph\u1ea1m th\u1eddi gian, h\u00e0nh vi v\u1eadt l\u00fd c\u1ee7a m\u1ea1ch thay \u0111\u1ed5i. H\u1eadu qu\u1ea3 ph\u1ed5 bi\u1ebfn nh\u1ea5t l\u00e0 l\u1ed7i d\u1eef li\u1ec7u. M\u1ed9t thanh ghi c\u00f3 th\u1ec3 ghi nh\u1eadn m\u1ed9t \u20181\u2019 khi n\u00f3 n\u00ean ghi nh\u1eadn m\u1ed9t \u20180\u2019. Trong c\u00e1c giao th\u1ee9c truy\u1ec1n th\u00f4ng, \u0111i\u1ec1u n\u00e0y d\u1eabn \u0111\u1ebfn l\u1ed7i khung ho\u1eb7c g\u00f3i tin b\u1ecb m\u1ea5t. Trong c\u00e1c h\u1ec7 th\u1ed1ng \u0111i\u1ec1u khi\u1ec3n, n\u00f3 c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn l\u1ec7nh \u0111i\u1ec1u khi\u1ec3n c\u01a1 c\u1ea5u ch\u1ea5p h\u00e0nh sai, c\u00f3 th\u1ec3 g\u00e2y h\u01b0 h\u1ea1i v\u1eadt l\u00fd ho\u1eb7c nguy c\u01a1 an to\u00e0n.<\/p>\n

            H\u01a1n n\u1eefa, vi ph\u1ea1m th\u1eddi gian c\u00f3 th\u1ec3 g\u00e2y ra l\u1ed7i ng\u1eaft qu\u00e3ng. M\u1ed9t h\u1ec7 th\u1ed1ng c\u00f3 th\u1ec3 ho\u1ea1t \u0111\u1ed9ng ho\u00e0n h\u1ea3o \u1edf nhi\u1ec7t \u0111\u1ed9 ph\u00f2ng nh\u01b0ng th\u1ea5t b\u1ea1i khi n\u00f3ng l\u00ean. \u0110i\u1ec1u n\u00e0y x\u1ea3y ra v\u00ec \u0111\u1ed9 tr\u1ec5 lan truy\u1ec1n t\u0103ng theo nhi\u1ec7t \u0111\u1ed9. Thi\u1ebft k\u1ebf v\u1edbi kho\u1ea3ng th\u1eddi gian an to\u00e0n \u0111\u1ee7 l\u1edbn s\u1ebd b\u00f9 \u0111\u1eafp cho nh\u1eefng thay \u0111\u1ed5i m\u00f4i tr\u01b0\u1eddng n\u00e0y.<\/p>\n

            Th\u1ef1c h\u00e0nh T\u1ed1t nh\u1ea5t cho S\u01a1 \u0111\u1ed3 Th\u1eddi gian \ud83d\udcdd<\/h2>\n

            T\u1ea1o ra c\u00e1c s\u01a1 \u0111\u1ed3 th\u1eddi gian r\u00f5 r\u00e0ng v\u00e0 ch\u00ednh x\u00e1c l\u00e0 m\u1ed9t k\u1ef9 n\u0103ng \u0111\u01b0\u1ee3c c\u1ea3i thi\u1ec7n qua th\u1ef1c h\u00e0nh. Tu\u00e2n theo c\u00e1c h\u01b0\u1edbng d\u1eabn n\u00e0y \u0111\u1ec3 t\u1ea1o ra c\u00e1c s\u01a1 \u0111\u1ed3 d\u1ec5 hi\u1ec3u \u0111\u1ed1i v\u1edbi ng\u01b0\u1eddi kh\u00e1c.<\/p>\n

              \n
            • Ghi nh\u00e3n T\u1ea5t c\u1ea3:<\/strong>M\u1ed7i \u0111\u01b0\u1eddng t\u00edn hi\u1ec7u \u0111\u1ec1u ph\u1ea3i c\u00f3 t\u00ean r\u00f5 r\u00e0ng. Tr\u00e1nh s\u1eed d\u1ee5ng c\u00e1c nh\u00e3n chung chung nh\u01b0 \u201cT\u00edn hi\u1ec7u 1\u201d.<\/li>\n
            • S\u1eed d\u1ee5ng T\u1ef7 l\u1ec7 Nh\u1ea5t qu\u00e1n:<\/strong>Duy tr\u00ec t\u1ef7 l\u1ec7 th\u1eddi gian \u0111\u1ed3ng nh\u1ea5t tr\u00ean to\u00e0n b\u1ed9 s\u01a1 \u0111\u1ed3, tr\u1eeb khi b\u1ea1n c\u1ea7n ph\u00f3ng to v\u00e0o m\u1ed9t s\u1ef1 ki\u1ec7n c\u1ee5 th\u1ec3.<\/li>\n
            • Nh\u1ea5n m\u1ea1nh C\u00e1c S\u1ef1 ki\u1ec7n Quan tr\u1ecdng:<\/strong>S\u1eed d\u1ee5ng c\u00e1c m\u00e0u s\u1eafc kh\u00e1c nhau ho\u1eb7c \u0111\u01b0\u1eddng n\u00e9t \u0111\u1eadm h\u01a1n \u0111\u1ec3 \u0111\u00e1nh d\u1ea5u c\u00e1c kho\u1ea3ng th\u1eddi gian thi\u1ebft l\u1eadp v\u00e0 gi\u1eef.<\/li>\n
            • Bao g\u1ed3m Ghi ch\u00fa:<\/strong>Th\u00eam c\u00e1c ghi ch\u00fa v\u0103n b\u1ea3n \u0111\u1ec3 gi\u1ea3i th\u00edch c\u00e1c t\u01b0\u01a1ng t\u00e1c ph\u1ee9c t\u1ea1p ho\u1eb7c c\u00e1c r\u00e0ng bu\u1ed9c c\u1ee5 th\u1ec3.<\/li>\n
            • X\u00e1c minh v\u1edbi B\u1ea3ng Th\u00f4ng s\u1ed1 K\u1ef9 thu\u1eadt:<\/strong>Lu\u00f4n ki\u1ec3m tra ch\u00e9o c\u00e1c tham s\u1ed1 s\u01a1 \u0111\u1ed3 c\u1ee7a b\u1ea1n v\u1edbi th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt ch\u00ednh th\u1ee9c c\u1ee7a linh ki\u1ec7n.<\/li>\n<\/ul>\n

              Xem x\u00e9t N\u00e2ng cao: C\u00e1c mi\u1ec1n \u0110\u1ed3ng h\u1ed3 \u0110a chi\u1ec1u \ud83c\udf10<\/h2>\n

              C\u00e1c h\u1ec7 th\u1ed1ng hi\u1ec7n \u0111\u1ea1i th\u01b0\u1eddng s\u1eed d\u1ee5ng nhi\u1ec1u mi\u1ec1n \u0111\u1ed3ng h\u1ed3. V\u00ed d\u1ee5, m\u1ed9t b\u1ed9 x\u1eed l\u00fd c\u00f3 th\u1ec3 ch\u1ea1y \u1edf 2 GHz trong khi b\u1ed9 \u0111i\u1ec1u khi\u1ec3n b\u1ed9 nh\u1edb ch\u1ea1y \u1edf 400 MHz. S\u01a1 \u0111\u1ed3 th\u1eddi gian cho c\u00e1c h\u1ec7 th\u1ed1ng n\u00e0y tr\u1edf n\u00ean ph\u1ee9c t\u1ea1p h\u01a1n \u0111\u00e1ng k\u1ec3. B\u1ea1n ph\u1ea3i t\u00ednh \u0111\u1ebfn:<\/p>\n

                \n
              • L\u1ea5y m\u1eabu gi\u1eefa c\u00e1c \u0111\u1ed3ng h\u1ed3:<\/strong>D\u1eef li\u1ec7u di chuy\u1ec3n t\u1eeb t\u1ea7n s\u1ed1 n\u00e0y sang t\u1ea7n s\u1ed1 kh\u00e1c nh\u01b0 th\u1ebf n\u00e0o.<\/li>\n
              • B\u1ed9 \u0111\u1ec7m FIFO:<\/strong>L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 \u0111\u1ed3ng b\u1ed9 lu\u1ed3ng d\u1eef li\u1ec7u gi\u1eefa c\u00e1c \u0111\u1ed3ng h\u1ed3 b\u1ea5t \u0111\u1ed3ng b\u1ed9.<\/li>\n
              • \u0110\u1ed3ng b\u1ed9 h\u00f3a t\u00edn hi\u1ec7u kh\u1edfi \u0111\u1ed9ng l\u1ea1i:<\/strong>\u0110\u1ea3m b\u1ea3o t\u1ea5t c\u1ea3 c\u00e1c mi\u1ec1n \u0111\u01b0\u1ee3c kh\u1edfi \u0111\u1ed9ng l\u1ea1i theo c\u00e1ch ph\u1ed1i h\u1ee3p \u0111\u1ec3 tr\u00e1nh s\u1ef1 b\u1ea5t nh\u1ea5t tr\u1ea1ng th\u00e1i.<\/li>\n<\/ul>\n

                Khi ph\u00e2n t\u00edch c\u00e1c s\u01a1 \u0111\u1ed3 n\u00e0y, h\u00e3y t\u00ecm ki\u1ebfm logic \u0111\u1ed3ng b\u1ed9 h\u00f3a, ch\u1eb3ng h\u1ea1n nh\u01b0 t\u00edn hi\u1ec7u trao \u0111\u1ed5i ho\u1eb7c chu\u1ed7i \u0111\u1ed3ng b\u1ed9 h\u00f3a. Nh\u1eefng th\u00e0nh ph\u1ea7n n\u00e0y \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1eb7c bi\u1ec7t \u0111\u1ec3 n\u1ed1i li\u1ec1n kho\u1ea3ng c\u00e1ch gi\u1eefa c\u00e1c mi\u1ec1n th\u1eddi gian kh\u00e1c nhau m\u1ed9t c\u00e1ch an to\u00e0n.<\/p>\n

                K\u1ebft lu\u1eadn: \u0110\u1ed9 ch\u00ednh x\u00e1c l\u00e0 ch\u00eca kh\u00f3a \ud83d\udd11<\/h2>\n

                S\u01a1 \u0111\u1ed3 th\u1eddi gian kh\u00f4ng ch\u1ec9 \u0111\u01a1n thu\u1ea7n l\u00e0 h\u00ecnh \u1ea3nh; ch\u00fang l\u00e0 b\u1eb1ng ch\u1ee9ng to\u00e1n h\u1ecdc cho m\u1ed9t h\u1ec7 th\u1ed1ng ho\u1ea1t \u0111\u1ed9ng. Ch\u00fang x\u00e1c \u0111\u1ecbnh ranh gi\u1edbi v\u1ec1 \u0111\u1ed9 tin c\u1eady v\u00e0 hi\u1ec7u su\u1ea5t. B\u1eb1ng c\u00e1ch hi\u1ec3u r\u00f5 c\u00e1c th\u00e0nh ph\u1ea7n c\u1ed1t l\u00f5i, tham s\u1ed1 v\u00e0 nh\u1eefng r\u1ee7i ro ti\u1ec1m \u1ea9n, b\u1ea1n c\u00f3 th\u1ec3 thi\u1ebft k\u1ebf c\u00e1c h\u1ec7 th\u1ed1ng ho\u1ea1t \u0111\u1ed9ng ch\u00ednh x\u00e1c trong \u0111i\u1ec1u ki\u1ec7n th\u1ef1c t\u1ebf. S\u1ef1 ch\u00fa \u00fd \u0111\u1ebfn th\u1eddi gian thi\u1ebft l\u1eadp, th\u1eddi gian gi\u1eef v\u00e0 \u0111\u1ed9 tr\u1ec5 lan truy\u1ec1n s\u1ebd ph\u00e2n bi\u1ec7t gi\u1eefa m\u1ed9t m\u1eabu th\u1eed ho\u1ea1t \u0111\u1ed9ng v\u00e0 m\u1ed9t s\u1ea3n ph\u1ea9m s\u1eb5n s\u00e0ng s\u1ea3n xu\u1ea5t. Vi\u1ec7c luy\u1ec7n t\u1eadp li\u00ean t\u1ee5c trong vi\u1ec7c \u0111\u1ecdc v\u00e0 t\u1ea1o ra c\u00e1c s\u01a1 \u0111\u1ed3 n\u00e0y s\u1ebd r\u00e8n luy\u1ec7n tr\u1ef1c gi\u00e1c k\u1ef9 thu\u1eadt c\u1ee7a b\u1ea1n v\u00e0 c\u1ea3i thi\u1ec7n k\u1ebft qu\u1ea3 k\u1ef9 thu\u1eadt c\u1ee7a b\u1ea1n.<\/p>\n

                H\u00e3y nh\u1edb r\u1eb1ng m\u1ed7i c\u1ea1nh \u0111\u1ec1u k\u1ec3 m\u1ed9t c\u00e2u chuy\u1ec7n v\u1ec1 d\u00f2ng ch\u1ea3y th\u00f4ng tin. T\u00f4n tr\u1ecdng th\u1eddi gian m\u00e0 th\u00f4ng tin c\u1ea7n \u0111\u1ec3 di chuy\u1ec3n, v\u00e0 thi\u1ebft k\u1ebf c\u1ee7a b\u1ea1n s\u1ebd v\u01b0\u1ee3t qua th\u1eed th\u00e1ch c\u1ee7a th\u1eddi gian.<\/p>\n","protected":false},"excerpt":{"rendered":"

                Trong th\u1ebf gi\u1edbi \u0111i\u1ec7n t\u1eed s\u1ed1 v\u00e0 k\u1ef9 thu\u1eadt ph\u1ea7n c\u1ee9ng, vi\u1ec7c giao ti\u1ebfp gi\u1eefa c\u00e1c th\u00e0nh ph\u1ea7n ph\u1ee5 thu\u1ed9c v\u00e0o s\u1ef1 ph\u1ed1i h\u1ee3p ch\u00ednh x\u00e1c. Kh\u00f4ng c\u00f3 s\u1ef1 hi\u1ec3u…<\/p>\n","protected":false},"author":1,"featured_media":1756,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_title":"H\u1ecfi \u0111\u00e1p s\u01a1 \u0111\u1ed3 th\u1eddi gian: H\u01b0\u1edbng d\u1eabn thi\u1ebft y\u1ebfu v\u1ec1 th\u1eddi gian t\u00edn hi\u1ec7u \u23f1\ufe0f","_yoast_wpseo_metadesc":"T\u00ecm hi\u1ec3u s\u00e2u v\u1ec1 s\u01a1 \u0111\u1ed3 th\u1eddi gian. H\u1ecdc th\u1eddi gian thi\u1ebft l\u1eadp\/th\u1eddi gian gi\u1eef, \u0111\u1ed9 l\u1ec7ch \u0111\u1ed3ng h\u1ed3 v\u00e0 ph\u00e2n t\u00edch d\u1ea1ng s\u00f3ng. H\u01b0\u1edbng d\u1eabn thi\u1ebft y\u1ebfu cho k\u1ef9 s\u01b0 k\u1ef9 thu\u1eadt s\u1ed1.","fifu_image_url":"","fifu_image_alt":"","footnotes":""},"categories":[60],"tags":[87,92],"class_list":["post-1755","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-unified-modeling-language","tag-academic","tag-timing-diagram"],"yoast_head":"\nH\u1ecfi \u0111\u00e1p s\u01a1 \u0111\u1ed3 th\u1eddi gian: H\u01b0\u1edbng d\u1eabn thi\u1ebft y\u1ebfu v\u1ec1 th\u1eddi gian t\u00edn hi\u1ec7u \u23f1\ufe0f<\/title>\n<meta name=\"description\" content=\"T\u00ecm hi\u1ec3u s\u00e2u v\u1ec1 s\u01a1 \u0111\u1ed3 th\u1eddi gian. H\u1ecdc th\u1eddi gian thi\u1ebft l\u1eadp\/th\u1eddi gian gi\u1eef, \u0111\u1ed9 l\u1ec7ch \u0111\u1ed3ng h\u1ed3 v\u00e0 ph\u00e2n t\u00edch d\u1ea1ng s\u00f3ng. 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