{"id":2012,"date":"2026-03-27T11:40:14","date_gmt":"2026-03-27T11:40:14","guid":{"rendered":"https:\/\/www.tech-posts.com\/vi\/timing-diagrams-embedded-systems-applications\/"},"modified":"2026-03-27T11:40:14","modified_gmt":"2026-03-27T11:40:14","slug":"timing-diagrams-embedded-systems-applications","status":"publish","type":"post","link":"https:\/\/www.tech-posts.com\/vi\/timing-diagrams-embedded-systems-applications\/","title":{"rendered":"C\u00e1c \u1ee9ng d\u1ee5ng th\u1ef1c t\u1ebf c\u1ee7a s\u01a1 \u0111\u1ed3 th\u1eddi gian trong c\u00e1c h\u1ec7 th\u1ed1ng nh\u00fang"},"content":{"rendered":"

Trong th\u1ebf gi\u1edbi ph\u1ee9c t\u1ea1p c\u1ee7a k\u1ef9 thu\u1eadt nh\u00fang, \u0111\u1ed9 ch\u00ednh x\u00e1c kh\u00f4ng ch\u1ec9 l\u00e0 m\u1ed9t s\u1ef1 l\u1ef1a ch\u1ecdn m\u00e0 l\u00e0 m\u1ed9t y\u00eau c\u1ea7u b\u1eaft bu\u1ed9c. C\u00e1c s\u01a1 \u0111\u1ed3 th\u1eddi gian \u0111\u00f3ng vai tr\u00f2 l\u00e0 b\u1ea3n v\u1ebd tr\u1ef1c quan \u0111\u1ec3 hi\u1ec3u c\u00e1ch c\u00e1c t\u00edn hi\u1ec7u t\u01b0\u01a1ng t\u00e1c theo th\u1eddi gian. Nh\u1eefng bi\u1ec3u di\u1ec5n \u0111\u1ed3 h\u1ecda n\u00e0y bi\u1ec3u di\u1ec5n c\u00e1c m\u1ee9c \u0111i\u1ec7n \u00e1p, chu k\u1ef3 \u0111\u1ed3ng h\u1ed3 v\u00e0 c\u00e1c chuy\u1ec3n \u0111\u1ed5i d\u1eef li\u1ec7u theo tr\u1ee5c th\u1eddi gian. \u0110\u1ed1i v\u1edbi c\u00e1c k\u1ef9 s\u01b0 thi\u1ebft k\u1ebf vi \u0111i\u1ec1u khi\u1ec3n, c\u1ea3m bi\u1ebfn ho\u1eb7c giao di\u1ec7n truy\u1ec1n th\u00f4ng, vi\u1ec7c th\u00e0nh th\u1ea1o vi\u1ec7c \u0111\u1ecdc v\u00e0 t\u1ea1o ra c\u00e1c s\u01a1 \u0111\u1ed3 n\u00e0y l\u00e0 \u0111i\u1ec1u c\u1ea7n thi\u1ebft \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o \u0111\u1ed9 tin c\u1eady c\u1ee7a h\u1ec7 th\u1ed1ng.<\/p>\n

Kh\u00f4ng c\u00f3 c\u00e1i nh\u00ecn r\u00f5 r\u00e0ng v\u1ec1 c\u00e1c m\u1ed1i quan h\u1ec7 theo th\u1eddi gian, c\u00e1c th\u00e0nh ph\u1ea7n ph\u1ea7n c\u1ee9ng c\u00f3 th\u1ec3 kh\u00f4ng th\u1ec3 giao ti\u1ebfp v\u1edbi nhau, d\u1eabn \u0111\u1ebfn l\u1ed7i d\u1eef li\u1ec7u ho\u1eb7c s\u1eadp h\u1ec7 th\u1ed1ng. H\u01b0\u1edbng d\u1eabn n\u00e0y kh\u00e1m ph\u00e1 c\u00e1c \u1ee9ng d\u1ee5ng th\u1ef1c t\u1ebf c\u1ee7a s\u01a1 \u0111\u1ed3 th\u1eddi gian trong nhi\u1ec1u l\u0129nh v\u1ef1c kh\u00e1c nhau c\u1ee7a ph\u00e1t tri\u1ec3n nh\u00fang, cung c\u1ea5p c\u00e1i nh\u00ecn s\u00e2u s\u1eafc v\u1ec1 l\u1ee3i \u00edch c\u1ee7a ch\u00fang m\u00e0 kh\u00f4ng ph\u1ee5 thu\u1ed9c v\u00e0o c\u00e1c c\u00f4ng c\u1ee5 ph\u1ea7n m\u1ec1m c\u1ee5 th\u1ec3.<\/p>\n

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

\ud83d\udd0c Ph\u00e2n t\u00edch giao th\u1ee9c truy\u1ec1n th\u00f4ng<\/h2>\n

Giao ti\u1ebfp n\u1ed1i ti\u1ebfp l\u00e0 n\u1ec1n t\u1ea3ng c\u1ee7a c\u00e1c h\u1ec7 th\u1ed1ng nh\u00fang hi\u1ec7n \u0111\u1ea1i. D\u1eef li\u1ec7u hi\u1ebfm khi \u1edf l\u1ea1i trong m\u1ed9t chip duy nh\u1ea5t; n\u00f3 di chuy\u1ec3n gi\u1eefa c\u00e1c b\u1ed9 x\u1eed l\u00fd, b\u1ed9 nh\u1edb v\u00e0 c\u00e1c thi\u1ebft b\u1ecb ngo\u1ea1i vi. C\u00e1c s\u01a1 \u0111\u1ed3 th\u1eddi gian l\u00e0 y\u1ebfu t\u1ed1 then ch\u1ed1t \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh v\u00e0 ki\u1ec3m ch\u1ee9ng c\u00e1c t\u01b0\u01a1ng t\u00e1c n\u00e0y.<\/p>\n

Giao th\u1ee9c m\u1ea1ch t\u00edch h\u1ee3p gi\u1eefa c\u00e1c thi\u1ebft b\u1ecb (I2C)<\/h3>\n

Giao th\u1ee9c I2C s\u1eed d\u1ee5ng giao di\u1ec7n hai d\u00e2y: D\u1eef li\u1ec7u n\u1ed1i ti\u1ebfp (SDA) v\u00e0 \u0110\u1ed3ng h\u1ed3 n\u1ed1i ti\u1ebfp (SCL). S\u01a1 \u0111\u1ed3 th\u1eddi gian cho I2C ti\u1ebft l\u1ed9 tr\u00ecnh t\u1ef1 c\u1ee5 th\u1ec3 c\u1ea7n thi\u1ebft cho vi\u1ec7c truy\u1ec1n d\u1eef li\u1ec7u.<\/p>\n

    \n
  • \u0110i\u1ec1u ki\u1ec7n b\u1eaft \u0111\u1ea7u:<\/strong> D\u00e2y SDA chuy\u1ec3n t\u1eeb cao xu\u1ed1ng th\u1ea5p trong khi d\u00e2y SCL v\u1eabn \u1edf m\u1ee9c cao. \u0110i\u1ec1u n\u00e0y b\u00e1o hi\u1ec7u cho bus b\u1eaft \u0111\u1ea7u m\u1ed9t giao d\u1ecbch.<\/li>\n
  • Khung \u0111\u1ecba ch\u1ec9:<\/strong> Byte \u0111\u1ea7u ti\u00ean \u0111\u01b0\u1ee3c g\u1eedi ch\u1ee9a \u0111\u1ecba ch\u1ec9 7 bit c\u1ee7a thi\u1ebft b\u1ecb \u0111\u00edch c\u1ed9ng th\u00eam m\u1ed9t bit \u0111\u1ecdc\/ghi.<\/li>\n
  • X\u00e1c nh\u1eadn:<\/strong> Thi\u1ebft b\u1ecb nh\u1eadn k\u00e9o d\u00e2y SDA xu\u1ed1ng th\u1ea5p trong xung \u0111\u1ed3ng h\u1ed3 th\u1ee9 ch\u00edn \u0111\u1ec3 x\u00e1c nh\u1eadn \u0111\u00e3 nh\u1eadn \u0111\u01b0\u1ee3c d\u1eef li\u1ec7u.<\/li>\n
  • \u0110i\u1ec1u ki\u1ec7n d\u1eebng:<\/strong> D\u00e2y SDA chuy\u1ec3n t\u1eeb th\u1ea5p l\u00ean cao trong khi SCL \u1edf m\u1ee9c cao, gi\u1ea3i ph\u00f3ng bus.<\/li>\n<\/ul>\n

    C\u00e1c k\u1ef9 s\u01b0 s\u1eed d\u1ee5ng c\u00e1c s\u01a1 \u0111\u1ed3 n\u00e0y \u0111\u1ec3 ph\u00e1t hi\u1ec7n c\u00e1c v\u1ea5n \u0111\u1ec1 nh\u01b0 k\u00e9o d\u00e0i \u0111\u1ed3ng h\u1ed3. N\u1ebfu thi\u1ebft b\u1ecb n\u00f4 l\u1ec7 kh\u00f4ng th\u1ec3 x\u1eed l\u00fd d\u1eef li\u1ec7u nhanh \u0111\u1ee7, n\u00f3 s\u1ebd gi\u1eef d\u00e2y SCL \u1edf m\u1ee9c th\u1ea5p. S\u01a1 \u0111\u1ed3 th\u1eddi gian cho th\u1ea5y s\u1ef1 k\u00e9o d\u00e0i n\u00e0y, gi\u00fap nh\u00e0 thi\u1ebft k\u1ebf \u0111i\u1ec1u ch\u1ec9nh v\u00f2ng x\u1eed l\u00fd ho\u1eb7c k\u00edch th\u01b0\u1edbc b\u1ed9 \u0111\u1ec7m.<\/p>\n

    Giao th\u1ee9c giao ti\u1ebfp ngo\u1ea1i vi n\u1ed1i ti\u1ebfp (SPI)<\/h3>\n

    SPI l\u00e0 m\u1ed9t giao th\u1ee9c \u0111\u1ed3ng b\u1ed9 th\u01b0\u1eddng \u0111\u01b0\u1ee3c d\u00f9ng cho truy\u1ec1n th\u00f4ng t\u1ed1c \u0111\u1ed9 cao. N\u00f3 bao g\u1ed3m b\u1ed1n \u0111\u01b0\u1eddng d\u00e2y: Master Out Slave In (MOSI), Master In Slave Out (MISO), \u0110\u1ed3ng h\u1ed3 n\u1ed1i ti\u1ebfp (SCK) v\u00e0 Ch\u1ecdn thi\u1ebft b\u1ecb n\u00f4 l\u1ec7 (SS).<\/p>\n

      \n
    • \u0110\u1ed9 c\u1ef1c c\u1ee7a \u0111\u1ed3ng h\u1ed3 (CPOL):<\/strong> X\u00e1c \u0111\u1ecbnh tr\u1ea1ng th\u00e1i ch\u1edd c\u1ee7a \u0111\u01b0\u1eddng d\u00e2y \u0111\u1ed3ng h\u1ed3. N\u00f3 \u1edf m\u1ee9c cao hay th\u1ea5p tr\u01b0\u1edbc khi d\u1eef li\u1ec7u b\u1eaft \u0111\u1ea7u?<\/li>\n
    • Giai \u0111o\u1ea1n \u0111\u1ed3ng h\u1ed3 (CPHA):<\/strong> X\u00e1c \u0111\u1ecbnh th\u1eddi \u0111i\u1ec3m d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c l\u1ea5y m\u1eabu. C\u00f3 ph\u1ea3i \u1edf c\u1ea1nh \u0111\u1ed3ng h\u1ed3 th\u1ee9 nh\u1ea5t hay th\u1ee9 hai?<\/li>\n
    • Th\u1eddi gian ch\u1ecdn chip:<\/strong> D\u00e2y SS ph\u1ea3i duy tr\u00ec \u1edf m\u1ee9c th\u1ea5p trong su\u1ed1t th\u1eddi gian giao d\u1ecbch. N\u1ebfu n\u00f3 b\u1ecb nh\u1ea3y l\u00ean cao, giao d\u1ecbch s\u1ebd b\u1ecb h\u1ee7y.<\/li>\n<\/ul>\n

      Hi\u1ec3u r\u00f5 c\u00e1c giai \u0111o\u1ea1n n\u00e0y l\u00e0 r\u1ea5t quan tr\u1ecdng. S\u1ef1 sai l\u1ec7ch v\u1ec1 CPOL ho\u1eb7c CPHA gi\u1eefa thi\u1ebft b\u1ecb ch\u1ee7 v\u00e0 thi\u1ebft b\u1ecb n\u00f4 l\u1ec7 s\u1ebd d\u1eabn \u0111\u1ebfn d\u1eef li\u1ec7u l\u1ed7i. S\u01a1 \u0111\u1ed3 th\u1eddi gian tr\u1ef1c quan h\u00f3a c\u00e1c c\u1ea1nh n\u00e0y, gi\u00fap d\u1ec5 d\u00e0ng ph\u00e1t hi\u1ec7n s\u1ef1 sai l\u1ec7ch trong qu\u00e1 tr\u00ecnh kh\u1edfi \u0111\u1ed9ng ph\u1ea7n c\u1ee9ng.<\/p>\n

      B\u1ed9 thu ph\u00e1t b\u1ea5t \u0111\u1ed3ng b\u1ed9 ph\u1ed5 d\u1ee5ng (UART)<\/h3>\n

      Kh\u00e1c v\u1edbi SPI v\u00e0 I2C, UART kh\u00f4ng s\u1eed d\u1ee5ng d\u00e2y \u0111\u1ed3ng h\u1ed3. Vi\u1ec7c \u0111\u1ed3ng b\u1ed9 d\u1ef1a v\u00e0o t\u1ed1c \u0111\u1ed9 truy\u1ec1n (baud rate) \u0111\u00e3 \u0111\u01b0\u1ee3c th\u1ed1ng nh\u1ea5t. C\u00e1c s\u01a1 \u0111\u1ed3 th\u1eddi gian \u1edf \u0111\u00e2y t\u1eadp trung v\u00e0o kho\u1ea3ng th\u1eddi gian bit v\u00e0 khung d\u1eef li\u1ec7u.<\/p>\n

        \n
      • Bit b\u1eaft \u0111\u1ea7u:<\/strong> M\u1ed9t xung th\u1ea5p cho bi\u1ebft b\u1eaft \u0111\u1ea7u c\u1ee7a m\u1ed9t byte.<\/li>\n
      • C\u00e1c bit d\u1eef li\u1ec7u:<\/strong> Th\u01b0\u1eddng l\u00e0 8 bit, \u0111\u01b0\u1ee3c truy\u1ec1n b\u1eaft \u0111\u1ea7u t\u1eeb bit \u00edt \u0437\u043d\u0430\u0447\u0438\u043c\u044b\u0439 (LSB).<\/li>\n
      • Bit d\u1eebng:<\/strong> M\u1ed9t xung cao b\u00e1o hi\u1ec7u k\u1ebft th\u00fac c\u1ee7a m\u1ed9t byte.<\/li>\n<\/ul>\n

        S\u01a1 \u0111\u1ed3 th\u1eddi gian gi\u00fap k\u1ef9 s\u01b0 t\u00ednh to\u00e1n kho\u1ea3ng ch\u1ea5p nh\u1eadn \u0111\u01b0\u1ee3c. N\u1ebfu \u0111\u1ed3ng h\u1ed3 c\u1ee7a hai thi\u1ebft b\u1ecb l\u1ec7ch qu\u00e1 xa, \u0111i\u1ec3m l\u1ea5y m\u1eabu s\u1ebd d\u1ecbch chuy\u1ec3n, g\u00e2y ra l\u1ed7i. S\u01a1 \u0111\u1ed3 minh h\u1ecda kho\u1ea3ng th\u1eddi gian l\u1ea5y m\u1eabu, th\u01b0\u1eddng \u0111\u01b0\u1ee3c \u0111\u1eb7t \u1edf gi\u1eefa th\u1eddi gian bit.<\/p>\n

        \u23f1\ufe0f \u0110\u1ed3ng b\u1ed9 h\u00f3a ph\u1ea7n c\u1ee9ng v\u00e0 th\u1eddi gian thi\u1ebft l\u1eadp<\/h2>\n

        Ngo\u00e0i giao ti\u1ebfp, s\u01a1 \u0111\u1ed3 th\u1eddi gian l\u00e0 c\u00f4ng c\u1ee5 kh\u00f4ng th\u1ec3 thi\u1ebfu \u0111\u1ec3 hi\u1ec3u c\u00e1ch c\u00e1c c\u1ed5ng logic v\u00e0 flip-flop t\u01b0\u01a1ng t\u00e1c v\u1edbi nhau. Logic s\u1ed1 ph\u1ee5 thu\u1ed9c v\u00e0o c\u00e1c r\u00e0ng bu\u1ed9c th\u1eddi gian ch\u00ednh x\u00e1c \u0111\u1ec3 ho\u1ea1t \u0111\u1ed9ng \u0111\u00fang.<\/p>\n

        Th\u1eddi gian thi\u1ebft l\u1eadp v\u00e0 th\u1eddi gian gi\u1eef<\/h3>\n

        Khi d\u1eef li\u1ec7u v\u00e0o m\u1ed9t thanh ghi ho\u1eb7c flip-flop, n\u00f3 ph\u1ea3i \u0111\u00e1p \u1ee9ng c\u00e1c y\u00eau c\u1ea7u th\u1eddi gian c\u1ee5 th\u1ec3 so v\u1edbi c\u1ea1nh \u0111\u1ed3ng h\u1ed3.<\/p>\n

          \n
        • Th\u1eddi gian thi\u1ebft l\u1eadp:<\/strong> Kho\u1ea3ng th\u1eddi gian t\u1ed1i thi\u1ec3u d\u1eef li\u1ec7u ph\u1ea3i \u1ed5n \u0111\u1ecbnh tr\u01b0\u1edbc<\/em>c\u1ea1nh \u0111\u1ed3ng h\u1ed3 \u0111\u1ebfn.<\/li>\n
        • Th\u1eddi gian gi\u1eef:<\/strong> Kho\u1ea3ng th\u1eddi gian t\u1ed1i thi\u1ec3u d\u1eef li\u1ec7u ph\u1ea3i duy tr\u00ec \u1ed5n \u0111\u1ecbnh sau<\/em>c\u1ea1nh \u0111\u1ed3ng h\u1ed3 \u0111\u1ebfn.<\/li>\n<\/ul>\n

          N\u1ebfu m\u1ed9t t\u00edn hi\u1ec7u vi ph\u1ea1m th\u1eddi gian thi\u1ebft l\u1eadp, thanh ghi c\u00f3 th\u1ec3 ghi nh\u1eadn gi\u00e1 tr\u1ecb sai. N\u1ebfu vi ph\u1ea1m th\u1eddi gian gi\u1eef, hi\u1ec7n t\u01b0\u1ee3ng b\u1ea5t \u1ed5n tr\u1ea1ng th\u00e1i c\u00f3 th\u1ec3 x\u1ea3y ra. S\u01a1 \u0111\u1ed3 th\u1eddi gian minh h\u1ecda t\u00edn hi\u1ec7u d\u1eef li\u1ec7u so v\u1edbi c\u1ea1nh \u0111\u1ed3ng h\u1ed3, l\u00e0m n\u1ed5i b\u1eadt c\u00e1c v\u00f9ng c\u1ea5m n\u01a1i thay \u0111\u1ed5i d\u1eef li\u1ec7u l\u00e0 kh\u00f4ng \u0111\u01b0\u1ee3c ph\u00e9p.<\/p>\n

          Chuy\u1ec3n mi\u1ec1n \u0111\u1ed3ng h\u1ed3 (CDC)<\/h3>\n

          C\u00e1c h\u1ec7 th\u1ed1ng ph\u1ee9c t\u1ea1p th\u01b0\u1eddng ch\u1ea1y c\u00e1c ph\u1ea7n logic kh\u00e1c nhau \u1edf t\u1ea7n s\u1ed1 \u0111\u1ed3ng h\u1ed3 kh\u00e1c nhau. Chuy\u1ec3n d\u1eef li\u1ec7u t\u1eeb mi\u1ec1n \u0111\u1ed3ng h\u1ed3 nhanh sang ch\u1eadm, ho\u1eb7c ng\u01b0\u1ee3c l\u1ea1i, mang l\u1ea1i r\u1ee7i ro.<\/p>\n

            \n
          • \u0110\u1ed3ng b\u1ed9 h\u00f3a:<\/strong> S\u1eed d\u1ee5ng chu\u1ed7i flip-flop \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o t\u00edn hi\u1ec7u \u1ed5n \u0111\u1ecbnh tr\u01b0\u1edbc khi s\u1eed d\u1ee5ng.<\/li>\n
          • Trao \u0111\u1ed5i t\u00edn hi\u1ec7u:<\/strong> S\u1eed d\u1ee5ng t\u00edn hi\u1ec7u y\u00eau c\u1ea7u v\u00e0 x\u00e1c nh\u1eadn \u0111\u1ec3 ph\u1ed1i h\u1ee3p truy\u1ec1n d\u1eef li\u1ec7u m\u00e0 kh\u00f4ng c\u1ea7n \u0111\u1ed3ng h\u1ed3 chung.<\/li>\n<\/ul>\n

            S\u01a1 \u0111\u1ed3 th\u1eddi gian cho CDC minh h\u1ecda tr\u00ecnh t\u1ef1 trao \u0111\u1ed5i t\u00edn hi\u1ec7u. N\u00f3 \u0111\u1ea3m b\u1ea3o d\u1eef li\u1ec7u h\u1ee3p l\u1ec7 tr\u01b0\u1edbc khi mi\u1ec1n nh\u1eadn x\u00e1c nh\u1eadn. \u0110i\u1ec1u n\u00e0y ng\u0103n ng\u1eeba m\u1ea5t d\u1eef li\u1ec7u trong c\u00e1c ph\u00e9p truy\u1ec1n b\u1ea5t \u0111\u1ed3ng b\u1ed9.<\/p>\n

            \ud83d\udd0d G\u1ee1 l\u1ed7i v\u00e0 \u0111\u1ed9 to\u00e0n v\u1eb9n t\u00edn hi\u1ec7u<\/h2>\n

            Khi m\u1ed9t h\u1ec7 th\u1ed1ng nh\u00fang ho\u1ea1t \u0111\u1ed9ng kh\u00f4ng nh\u01b0 mong \u0111\u1ee3i, s\u01a1 \u0111\u1ed3 th\u1eddi gian th\u01b0\u1eddng l\u00e0 n\u01a1i k\u1ef9 s\u01b0 \u0111\u1ea7u ti\u00ean t\u00ecm ki\u1ebfm. Ch\u00fang cung c\u1ea5p b\u1ea3n ghi l\u1ecbch s\u1eed v\u1ec1 h\u00e0nh vi t\u00edn hi\u1ec7u m\u00e0 ki\u1ec3m th\u1eed t\u0129nh kh\u00f4ng th\u1ec3 ghi nh\u1eadn.<\/p>\n

            Ph\u00e1t hi\u1ec7n c\u00e1c l\u1ed7i xung ng\u1eafn<\/h3>\n

            M\u1ed9t glitch l\u00e0 m\u1ed9t xung ng\u1eafn, kh\u00f4ng mong mu\u1ed1n tr\u00ean \u0111\u01b0\u1eddng t\u00edn hi\u1ec7u. N\u00f3 c\u00f3 th\u1ec3 ch\u1ec9 k\u00e9o d\u00e0i v\u00e0i nanosecond nh\u01b0ng c\u00f3 th\u1ec3 k\u00edch ho\u1ea1t thay \u0111\u1ed5i tr\u1ea1ng th\u00e1i trong m\u1ed9t flip-flop.<\/p>\n

              \n
            • \u0110i\u1ec1u ki\u1ec7n c\u1ea1nh tranh:<\/strong>X\u1ea3y ra khi th\u1ee9 t\u1ef1 c\u00e1c s\u1ef1 ki\u1ec7n c\u00f3 \u00fd ngh\u0129a, v\u00e0 th\u1eddi gian qu\u00e1 s\u00e1t nhau.<\/li>\n
            • Th\u1eddi gian tr\u1ec5 lan truy\u1ec1n:<\/strong>C\u00e1c t\u00edn hi\u1ec7u m\u1ea5t th\u1eddi gian \u0111\u1ec3 \u0111i qua c\u00e1c c\u1ed5ng logic. C\u00e1c s\u01a1 \u0111\u1ed3 th\u1eddi gian hi\u1ec3n th\u1ecb r\u00f5 r\u00e0ng nh\u1eefng \u0111\u1ed9 tr\u1ec5 n\u00e0y.<\/li>\n<\/ul>\n

              B\u1eb1ng c\u00e1ch ch\u1ed3ng l\u00ean s\u01a1 \u0111\u1ed3 th\u1eddi gian mong \u0111\u1ee3i v\u1edbi c\u00e1c t\u00edn hi\u1ec7u th\u1ef1c t\u1ebf \u0111\u00e3 thu \u0111\u01b0\u1ee3c, c\u00e1c k\u1ef9 s\u01b0 c\u00f3 th\u1ec3 x\u00e1c \u0111\u1ecbnh ch\u00ednh x\u00e1c n\u01a1i x\u1ea3y ra s\u1ef1 l\u1ec7ch l\u1ea1c. \u0110i\u1ec1u n\u00e0y cho ph\u00e9p kh\u1eafc ph\u1ee5c c\u00e1c v\u1ea5n \u0111\u1ec1 c\u1ee5 th\u1ec3 trong ph\u1ea7n m\u1ec1m ho\u1eb7c thi\u1ebft k\u1ebf ph\u1ea7n c\u1ee9ng.<\/p>\n

              Kho\u1ea3ng c\u00e1ch nhi\u1ec5u v\u00e0 th\u1eddi gian t\u0103ng\/gi\u1ea3m<\/h3>\n

              C\u00e1c t\u00edn hi\u1ec7u th\u1ef1c t\u1ebf kh\u00f4ng ph\u1ea3i l\u00e0 s\u00f3ng vu\u00f4ng ho\u00e0n h\u1ea3o. Ch\u00fang c\u00f3 th\u1eddi gian t\u0103ng v\u00e0 gi\u1ea3m do \u0111i\u1ec7n dung v\u00e0 \u0111\u1ed9 t\u1ef1 c\u1ea3m trong c\u00e1c \u0111\u01b0\u1eddng d\u1eabn.<\/p>\n

                \n
              • Th\u1eddi gian t\u0103ng:<\/strong> Th\u1eddi gian c\u1ea7n thi\u1ebft \u0111\u1ec3 t\u00edn hi\u1ec7u chuy\u1ec3n t\u1eeb th\u1ea5p sang cao.<\/li>\n
              • Th\u1eddi gian gi\u1ea3m:<\/strong> Th\u1eddi gian c\u1ea7n thi\u1ebft \u0111\u1ec3 t\u00edn hi\u1ec7u chuy\u1ec3n t\u1eeb cao sang th\u1ea5p.<\/li>\n<\/ul>\n

                N\u1ebfu c\u00e1c chuy\u1ec3n ti\u1ebfp n\u00e0y qu\u00e1 ch\u1eadm, t\u00edn hi\u1ec7u c\u00f3 th\u1ec3 m\u1ea5t qu\u00e1 nhi\u1ec1u th\u1eddi gian trong v\u00f9ng \u0111i\u1ec7n \u00e1p kh\u00f4ng x\u00e1c \u0111\u1ecbnh gi\u1eefa logic 0 v\u00e0 logic 1. \u0110i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn vi\u1ec7c k\u00edch ho\u1ea1t nhi\u1ec1u c\u1ea1nh xung \u0111\u1ed3ng h\u1ed3 ho\u1eb7c l\u1ed7i logic. S\u01a1 \u0111\u1ed3 th\u1eddi gian gi\u00fap \u0111o c\u00e1c \u0111\u1ed9 d\u1ed1c n\u00e0y \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o ch\u00fang \u0111\u00e1p \u1ee9ng c\u00e1c th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt c\u1ee7a chip nh\u1eadn t\u00edn hi\u1ec7u.<\/p>\n

                \ud83d\udca4 Qu\u1ea3n l\u00fd n\u0103ng l\u01b0\u1ee3ng v\u00e0 c\u00e1c tr\u1ea1ng th\u00e1i ti\u00eau th\u1ee5 th\u1ea5p<\/h2>\n

                Hi\u1ec7u su\u1ea5t n\u0103ng l\u01b0\u1ee3ng l\u00e0 m\u1ed9t v\u1ea5n \u0111\u1ec1 quan tr\u1ecdng trong c\u00e1c thi\u1ebft b\u1ecb nh\u00fang ho\u1ea1t \u0111\u1ed9ng b\u1eb1ng pin. S\u01a1 \u0111\u1ed3 th\u1eddi gian \u0111\u00f3ng vai tr\u00f2 trong vi\u1ec7c t\u1ed1i \u01b0u h\u00f3a ti\u00eau th\u1ee5 n\u0103ng l\u01b0\u1ee3ng.<\/p>\n

                \u0110\u1ed9 tr\u1ec5 \u0111\u00e1nh th\u1ee9c<\/h3>\n

                Khi m\u1ed9t thi\u1ebft b\u1ecb chuy\u1ec3n sang ch\u1ebf \u0111\u1ed9 ng\u1ee7, n\u00f3 s\u1ebd ng\u1eebng ho\u1ea1t \u0111\u1ed9ng c\u1ee7a \u0111\u1ed3ng h\u1ed3 \u0111\u1ec3 ti\u1ebft ki\u1ec7m n\u0103ng l\u01b0\u1ee3ng. Vi\u1ec7c \u0111\u00e1nh th\u1ee9c l\u1ea1i \u0111\u00f2i h\u1ecfi ph\u1ea3i kh\u00f4i ph\u1ee5c l\u1ea1i \u0111\u1ed3ng h\u1ed3 v\u00e0 \u1ed5n \u0111\u1ecbnh \u0111i\u1ec7n \u00e1p.<\/p>\n

                  \n
                • Th\u1eddi gian chuy\u1ec3n \u0111\u1ed5i:<\/strong> Th\u1eddi gian c\u1ea7n \u0111\u1ec3 chuy\u1ec3n t\u1eeb tr\u1ea1ng th\u00e1i ng\u1ee7 sang tr\u1ea1ng th\u00e1i ho\u1ea1t \u0111\u1ed9ng.<\/li>\n
                • \u0110\u1ed9 tr\u1ec5:<\/strong> Kho\u1ea3ng th\u1eddi gian tr\u1ec5 gi\u1eefa s\u1ef1 ki\u1ec7n \u0111\u00e1nh th\u1ee9c v\u00e0 b\u1ed9 x\u1eed l\u00fd th\u1ef1c thi m\u00e3 l\u1ec7nh.<\/li>\n<\/ul>\n

                  S\u01a1 \u0111\u1ed3 th\u1eddi gian c\u1ee7a chu tr\u00ecnh kh\u1edfi \u0111\u1ed9ng cho th\u1ea5y \u0111\u1ed9 tr\u1ec5 gi\u1eefa t\u00edn hi\u1ec7u k\u00edch ho\u1ea1t v\u00e0 \u0111\u1ed3ng h\u1ed3 h\u1ec7 th\u1ed1ng tr\u1edf n\u00ean \u1ed5n \u0111\u1ecbnh. Th\u00f4ng tin n\u00e0y r\u1ea5t quan tr\u1ecdng \u0111\u1ed1i v\u1edbi c\u00e1c \u1ee9ng d\u1ee5ng th\u1eddi gian th\u1ef1c, n\u01a1i \u0111\u1ed9 tr\u1ec5 v\u00e0i mili gi\u00e2y l\u00e0 \u0111\u00e1ng k\u1ec3.<\/p>\n

                  Thang \u0111o \u0111i\u1ec7n \u00e1p v\u00e0 t\u1ea7n s\u1ed1 \u0111\u1ed9ng (DVFS)<\/h3>\n

                  C\u00e1c h\u1ec7 th\u1ed1ng c\u00f3 th\u1ec3 \u0111i\u1ec1u ch\u1ec9nh \u0111i\u1ec7n \u00e1p v\u00e0 t\u1ea7n s\u1ed1 d\u1ef1a tr\u00ean t\u1ea3i c\u00f4ng vi\u1ec7c. S\u01a1 \u0111\u1ed3 th\u1eddi gian gi\u00fap x\u00e1c minh c\u00e1c chuy\u1ec3n \u0111\u1ed5i gi\u1eefa c\u00e1c tr\u1ea1ng th\u00e1i hi\u1ec7u su\u1ea5t kh\u00e1c nhau.<\/p>\n

                    \n
                  • D\u1ed1c t\u1ea7n s\u1ed1:<\/strong> \u0110\u1ed3ng h\u1ed3 thay \u0111\u1ed5i m\u1ed9t c\u00e1ch tr\u01a1n tru hay \u0111\u1ed9t ng\u1ed9t?<\/li>\n
                  • Th\u1eddi gian \u1ed5n \u0111\u1ecbnh \u0111i\u1ec7n \u00e1p:<\/strong> \u0110i\u1ec7n \u00e1p c\u00f3 \u1ed5n \u0111\u1ecbnh tr\u01b0\u1edbc khi \u00e1p d\u1ee5ng t\u1ea7n s\u1ed1 m\u1edbi kh\u00f4ng?<\/li>\n<\/ul>\n

                    Th\u1ee9 t\u1ef1 sai trong qu\u00e1 tr\u00ecnh DVFS c\u00f3 th\u1ec3 g\u00e2y ra hi\u1ec7n t\u01b0\u1ee3ng s\u1ee5t \u00e1p ho\u1eb7c l\u1ed7i logic. S\u01a1 \u0111\u1ed3 th\u1eddi gian cung c\u1ea5p x\u00e1c minh th\u1ee9 t\u1ef1 c\u1ea7n thi\u1ebft \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o c\u00e1c chuy\u1ec3n \u0111\u1ed5i an to\u00e0n.<\/p>\n

                    \ud83d\udee1\ufe0f C\u00e1c h\u1ec7 th\u1ed1ng quan tr\u1ecdng v\u1ec1 an to\u00e0n<\/h2>\n

                    Trong c\u00e1c \u1ee9ng d\u1ee5ng \u00f4 t\u00f4, y t\u1ebf v\u00e0 c\u00f4ng nghi\u1ec7p, an to\u00e0n l\u00e0 \u01b0u ti\u00ean h\u00e0ng \u0111\u1ea7u. S\u01a1 \u0111\u1ed3 th\u1eddi gian \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 x\u00e1c minh r\u1eb1ng c\u00e1c c\u01a1 ch\u1ebf an to\u00e0n ho\u1ea1t \u0111\u1ed9ng trong gi\u1edbi h\u1ea1n th\u1eddi gian y\u00eau c\u1ea7u.<\/p>\n

                    B\u1ed9 \u0111\u1ebfm gi\u00e1m s\u00e1t (Watchdog Timer)<\/h3>\n

                    B\u1ed9 \u0111\u1ebfm gi\u00e1m s\u00e1t s\u1ebd kh\u1edfi \u0111\u1ed9ng l\u1ea1i h\u1ec7 th\u1ed1ng n\u1ebfu ph\u1ea7n m\u1ec1m b\u1ecb treo. S\u01a1 \u0111\u1ed3 th\u1eddi gian x\u00e1c \u0111\u1ecbnh kho\u1ea3ng th\u1eddi gian h\u1ebft h\u1ea1n.<\/p>\n

                      \n
                    • Kho\u1ea3ng th\u1eddi gian h\u1ebft h\u1ea1n:<\/strong>Th\u1eddi gian t\u1ed1i \u0111a \u0111\u01b0\u1ee3c ph\u00e9p gi\u1eefa c\u00e1c l\u1ea7n kh\u1edfi \u0111\u1ed9ng l\u1ea1i.<\/li>\n
                    • C\u1eeda s\u1ed5 d\u1ecbch v\u1ee5:<\/strong>Th\u1eddi gian ph\u1ea7n m\u1ec1m c\u1ea7n \u0111\u1ec3 kh\u1edfi \u0111\u1ed9ng l\u1ea1i b\u1ed9 \u0111\u1ebfm th\u1eddi gian.<\/li>\n<\/ul>\n

                      N\u1ebfu c\u1eeda s\u1ed5 d\u1ecbch v\u1ee5 qu\u00e1 d\u00e0i, b\u1ed9 gi\u00e1m s\u00e1t c\u00f3 th\u1ec3 k\u00edch ho\u1ea1t m\u1ed9t c\u00e1ch kh\u00f4ng c\u1ea7n thi\u1ebft. N\u1ebfu qu\u00e1 ng\u1eafn, m\u1ed9t ng\u1eaft ch\u1eadm c\u00f3 th\u1ec3 g\u00e2y ra vi\u1ec7c kh\u1edfi \u0111\u1ed9ng l\u1ea1i sai. S\u01a1 \u0111\u1ed3 \u0111\u1ea3m b\u1ea3o th\u1eddi gian ho\u1ea1t \u0111\u1ed9ng ph\u00f9 h\u1ee3p v\u1edbi y\u00eau c\u1ea7u ti\u00eau chu\u1ea9n an to\u00e0n.<\/p>\n

                      \u0110a nhi\u1ec7m v\u00e0 b\u1ecf phi\u1ebfu<\/h3>\n

                      M\u1ed9t s\u1ed1 h\u1ec7 th\u1ed1ng s\u1eed d\u1ee5ng nhi\u1ec1u b\u1ed9 x\u1eed l\u00fd \u0111\u1ec3 b\u1ecf phi\u1ebfu cho \u0111\u1ea7u ra \u0111\u00fang. S\u01a1 \u0111\u1ed3 th\u1eddi gian \u0111\u1ea3m b\u1ea3o t\u1ea5t c\u1ea3 c\u00e1c b\u1ed9 x\u1eed l\u00fd \u0111\u1ea1t \u0111\u1ebfn giai \u0111o\u1ea1n b\u1ecf phi\u1ebfu c\u00f9ng m\u1ed9t l\u00fac.<\/p>\n

                        \n
                      • \u0110\u1ed3ng b\u1ed9 h\u00f3a:<\/strong>T\u1ea5t c\u1ea3 c\u00e1c k\u00eanh ph\u1ea3i \u0111\u1ed3ng b\u1ed9 h\u00f3a d\u1eef li\u1ec7u c\u1ee7a ch\u00fang.<\/li>\n
                      • H\u1ebft h\u1ea1n:<\/strong>N\u1ebfu m\u1ed9t k\u00eanh \u0111\u1ebfn mu\u1ed9n, h\u1ec7 th\u1ed1ng ph\u1ea3i ph\u00e1t hi\u1ec7n s\u1ef1 sai l\u1ec7ch.<\/li>\n<\/ul>\n

                        \u0110i\u1ec1u n\u00e0y r\u1ea5t quan tr\u1ecdng trong h\u1ec7 th\u1ed1ng \u0111i\u1ec1u khi\u1ec3n phanh ho\u1eb7c h\u1ec7 th\u1ed1ng l\u00e1i, n\u01a1i m\u1ed9t \u0111\u1ed9 tr\u1ec5 c\u00f3 th\u1ec3 g\u00e2y nguy hi\u1ec3m. S\u01a1 \u0111\u1ed3 th\u1eddi gian x\u00e1c \u0111\u1ecbnh \u0111\u1ed9 tr\u1ec5 c\u1ee7a t\u1eebng k\u00eanh \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o logic b\u1ecf phi\u1ebfu ho\u1ea1t \u0111\u1ed9ng ch\u00ednh x\u00e1c.<\/p>\n

                        \ud83d\udccb T\u1ed5ng quan so s\u00e1nh giao th\u1ee9c<\/h2>\n

                        B\u1ea3ng sau t\u00f3m t\u1eaft c\u00e1c \u0111\u1eb7c t\u00ednh th\u1eddi gian ch\u00ednh c\u1ee7a c\u00e1c giao di\u1ec7n nh\u00fang ph\u1ed5 bi\u1ebfn \u0111\u1ec3 h\u1ed7 tr\u1ee3 vi\u1ec7c l\u1ef1a ch\u1ecdn v\u00e0 thi\u1ebft k\u1ebf.<\/p>\n\n\n\n\n\n\n\n\n
                        Giao th\u1ee9c<\/th>\nPh\u1ea1m vi t\u1ed1c \u0111\u1ed9<\/th>\nPh\u01b0\u01a1ng ph\u00e1p \u0111\u1ed3ng b\u1ed9<\/th>\nTr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng \u0111i\u1ec3n h\u00ecnh<\/th>\nR\u00e0ng bu\u1ed9c th\u1eddi gian ch\u00ednh<\/th>\n<\/tr>\n<\/thead>\n
                        I2C<\/td>\n100 kHz \u0111\u1ebfn 3,4 MHz<\/td>\n\u0110\u1ed3ng h\u1ed3 chung<\/td>\nC\u1ea3m bi\u1ebfn, EEPROM<\/td>\nK\u00e9o d\u00e0i \u0111\u1ed3ng h\u1ed3<\/td>\n<\/tr>\n
                        SPI<\/td>\n1 MHz \u0111\u1ebfn 50 MHz+<\/td>\n\u0110\u1ed3ng h\u1ed3 ch\u1ee7<\/td>\nB\u1ed9 nh\u1edb flash, M\u00e0n h\u00ecnh hi\u1ec3n th\u1ecb<\/td>\nThi\u1ebft l\u1eadp ch\u1ecdn chip<\/td>\n<\/tr>\n
                        UART<\/td>\n9600 \u0111\u1ebfn 921600 bps<\/td>\nB\u1ea5t \u0111\u1ed3ng b\u1ed9<\/td>\nG\u1ee1 l\u1ed7i, GPS, Bluetooth<\/td>\n\u0110\u1ed9 dung sai t\u1ed1c \u0111\u1ed9 truy\u1ec1n<\/td>\n<\/tr>\n
                        USB<\/td>\n1,5 Mbps \u0111\u1ebfn 20 Gbps<\/td>\nD\u1ef1a tr\u00ean g\u00f3i d\u1eef li\u1ec7u<\/td>\nThi\u1ebft b\u1ecb ngo\u1ea1i vi, L\u01b0u tr\u1eef<\/td>\nTh\u1eddi gian token\/ho\u00e0n t\u00e1c<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                        \ud83d\udee0\ufe0f C\u00e1c b\u01b0\u1edbc tri\u1ec3n khai th\u1ef1c t\u1ebf<\/h2>\n

                        Vi\u1ec7c t\u1ea1o s\u01a1 \u0111\u1ed3 th\u1eddi gian \u0111\u00f2i h\u1ecfi m\u1ed9t ph\u01b0\u01a1ng ph\u00e1p c\u00f3 h\u1ec7 th\u1ed1ng. N\u00f3 b\u1eaft \u0111\u1ea7u b\u1eb1ng vi\u1ec7c hi\u1ec3u r\u00f5 t\u00e0i li\u1ec7u y\u00eau c\u1ea7u v\u00e0 k\u1ebft th\u00fac b\u1eb1ng b\u01b0\u1edbc x\u00e1c minh.<\/p>\n

                          \n
                        • Xem x\u00e9t t\u00e0i li\u1ec7u k\u1ef9 thu\u1eadt:<\/strong>M\u1ed7i th\u00e0nh ph\u1ea7n \u0111\u1ec1u c\u00f3 ph\u1ea7n th\u1eddi gian. H\u00e3y t\u00ecm c\u00e1c b\u1ea3ng \u0111\u1eb7c t\u00ednh AC.<\/li>\n
                        • X\u00e1c \u0111\u1ecbnh c\u00e1c \u0111\u01b0\u1eddng \u0111i quan tr\u1ecdng:<\/strong>X\u00e1c \u0111\u1ecbnh t\u00edn hi\u1ec7u n\u00e0o quy\u1ebft \u0111\u1ecbnh t\u1ed1c \u0111\u1ed9 t\u1ed1i \u0111a c\u1ee7a h\u1ec7 th\u1ed1ng.<\/li>\n
                        • X\u00e1c \u0111\u1ecbnh c\u00e1c m\u1ed1i quan h\u1ec7 ph\u1ee5 thu\u1ed9c:<\/strong>V\u1ebd c\u00e1c m\u1ed1i quan h\u1ec7 gi\u1eefa c\u00e1c t\u00edn hi\u1ec7u. T\u00edn hi\u1ec7u n\u00e0o k\u00edch ho\u1ea1t t\u00edn hi\u1ec7u kia?<\/li>\n
                        • X\u00e1c minh b\u1eb1ng thi\u1ebft b\u1ecb \u0111o:<\/strong>S\u1eed d\u1ee5ng b\u1ed9 ph\u00e2n t\u00edch logic ho\u1eb7c m\u00e1y hi\u1ec7n s\u00f3ng \u0111\u1ec3 ghi l\u1ea1i c\u00e1c d\u1ea1ng s\u00f3ng th\u1ef1c t\u1ebf.<\/li>\n
                        • Ph\u00e2n t\u00edch kho\u1ea3ng c\u00e1ch an to\u00e0n:<\/strong>\u0110\u1ea3m b\u1ea3o c\u00f3 \u0111\u1ee7 th\u1eddi gian gi\u1eefa c\u00e1c t\u00edn hi\u1ec7u \u0111\u1ec3 t\u00ednh \u0111\u1ebfn s\u1ef1 thay \u0111\u1ed5i v\u1ec1 nhi\u1ec7t \u0111\u1ed9 v\u00e0 \u0111i\u1ec7n \u00e1p.<\/li>\n<\/ul>\n

                          T\u00e0i li\u1ec7u l\u00e0 ch\u00eca kh\u00f3a. M\u1ed9t s\u01a1 \u0111\u1ed3 th\u1eddi gian \u0111\u01b0\u1ee3c ghi ch\u00fa r\u00f5 r\u00e0ng s\u1ebd l\u00e0 t\u00e0i li\u1ec7u tham kh\u1ea3o cho vi\u1ec7c b\u1ea3o tr\u00ec trong t\u01b0\u01a1ng lai. N\u00f3 gi\u1ea3i th\u00edch l\u00fd do t\u1ea1i sao m\u1ed9t s\u1ed1 \u0111\u1ed9 tr\u1ec5 \u0111\u01b0\u1ee3c th\u00eam v\u00e0o ho\u1eb7c t\u1ea1i sao c\u00e1c \u0111i\u1ec7n tr\u1edf k\u00e9o l\u00ean c\u1ee5 th\u1ec3 \u0111\u01b0\u1ee3c l\u1ef1a ch\u1ecdn.<\/p>\n

                          \ud83d\ude80 Nh\u1eefng c\u00e2n nh\u1eafc n\u00e2ng cao<\/h2>\n

                          Khi h\u1ec7 th\u1ed1ng tr\u1edf n\u00ean ph\u1ee9c t\u1ea1p h\u01a1n, ph\u00e2n t\u00edch th\u1eddi gian \u0111\u00f2i h\u1ecfi s\u1ef1 ch\u00fa \u00fd s\u00e2u s\u1eafc h\u01a1n.<\/p>\n

                          Jitter v\u00e0 nhi\u1ec5u pha<\/h3>\n

                          C\u00e1c t\u00edn hi\u1ec7u \u0111\u1ed3ng h\u1ed3 kh\u00f4ng ho\u00e0n to\u00e0n \u1ed5n \u0111\u1ecbnh. Jitter l\u00e0 \u0111\u1ed9 l\u1ec7ch c\u1ee7a c\u1ea1nh \u0111\u1ed3ng h\u1ed3 so v\u1edbi v\u1ecb tr\u00ed l\u00fd t\u01b0\u1edfng. S\u01a1 \u0111\u1ed3 th\u1eddi gian th\u1ec3 hi\u1ec7n s\u1ef1 thay \u0111\u1ed5i v\u1ec1 v\u1ecb tr\u00ed c\u1ea1nh trong nhi\u1ec1u chu k\u1ef3 li\u00ean ti\u1ebfp.<\/p>\n

                            \n
                          • Jitter chu k\u1ef3:<\/strong>S\u1ef1 thay \u0111\u1ed5i trong chu k\u1ef3 \u0111\u1ed3ng h\u1ed3.<\/li>\n
                          • Jitter t\u1eeb chu k\u1ef3 n\u00e0y sang chu k\u1ef3 ti\u1ebfp theo:<\/strong>S\u1ef1 thay \u0111\u1ed5i t\u1eeb chu k\u1ef3 n\u00e0y sang chu k\u1ef3 ti\u1ebfp theo.<\/li>\n<\/ul>\n

                            S\u1ef1 dao \u0111\u1ed9ng cao l\u00e0m gi\u1ea3m kho\u1ea3ng an to\u00e0n thi\u1ebft l\u1eadp v\u00e0 gi\u1eef. \u1ede c\u00e1c giao di\u1ec7n t\u1ed1c \u0111\u1ed9 cao nh\u01b0 b\u1ed9 nh\u1edb DDR, \u0111i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn l\u1ed7i \u0111\u1ecdc\/vi\u1ebft. C\u00e1c s\u01a1 \u0111\u1ed3 th\u1eddi gian gi\u00fap \u0111\u1ecbnh l\u01b0\u1ee3ng \u0111\u1ed9 dao \u0111\u1ed9ng n\u00e0y \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o n\u00f3 n\u1eb1m trong gi\u1edbi h\u1ea1n ch\u1ea5p nh\u1eadn \u0111\u01b0\u1ee3c.<\/p>\n

                            T\u00e1c \u0111\u1ed9ng nhi\u1ec7t<\/h3>\n

                            Nhi\u1ec7t \u0111\u1ed9 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn t\u1ed1c \u0111\u1ed9 c\u1ee7a c\u00e1c transistor. Khi chip n\u00f3ng l\u00ean, t\u00edn hi\u1ec7u s\u1ebd ch\u1eadm l\u1ea1i.<\/p>\n

                              \n
                            • Ph\u00e2n t\u00edch tr\u01b0\u1eddng h\u1ee3p x\u1ea5u nh\u1ea5t:<\/strong>Thi\u1ebft k\u1ebf cho nhi\u1ec7t \u0111\u1ed9 ho\u1ea1t \u0111\u1ed9ng t\u1ed1i \u0111a.<\/li>\n
                            • Gi\u1ea3m t\u1ed1c nhi\u1ec7t:<\/strong>\u0110\u1ea3m b\u1ea3o h\u1ec7 th\u1ed1ng kh\u00f4ng v\u01b0\u1ee3t qu\u00e1 gi\u1edbi h\u1ea1n nhi\u1ec7t an to\u00e0n trong qu\u00e1 tr\u00ecnh ho\u1ea1t \u0111\u1ed9ng t\u1ed1c \u0111\u1ed9 cao.<\/li>\n<\/ul>\n

                              M\u1ed9t s\u01a1 \u0111\u1ed3 th\u1eddi gian \u0111\u01b0\u1ee3c t\u1ea1o \u1edf nhi\u1ec7t \u0111\u1ed9 ph\u00f2ng c\u00f3 th\u1ec3 kh\u00f4ng c\u00f2n \u0111\u00fang \u1edf 85\u00b0C. C\u00e1c k\u1ef9 s\u01b0 ph\u1ea3i t\u00ednh \u0111\u1ebfn nh\u1eefng thay \u0111\u1ed5i nhi\u1ec7t n\u00e0y \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o \u0111\u1ed9 b\u1ec1n v\u1eefng.<\/p>\n

                              \ud83d\udcdd Nh\u1eefng suy ngh\u0129 cu\u1ed1i c\u00f9ng<\/h2>\n

                              C\u00e1c s\u01a1 \u0111\u1ed3 th\u1eddi gian kh\u00f4ng ch\u1ec9 \u0111\u01a1n thu\u1ea7n l\u00e0 b\u1ea3n v\u1ebd; ch\u00fang l\u00e0 ng\u00f4n ng\u1eef c\u1ee7a s\u1ef1 \u0111\u1ed3ng b\u1ed9 h\u00f3a. Ch\u00fang t\u1ea1o ra s\u1ef1 k\u1ebft n\u1ed1i gi\u1eefa logic l\u00fd thuy\u1ebft v\u00e0 th\u1ef1c t\u1ebf v\u1eadt l\u00fd. Trong c\u00e1c h\u1ec7 th\u1ed1ng nh\u00fang, n\u01a1i ph\u1ea7n c\u1ee9ng v\u00e0 ph\u1ea7n m\u1ec1m giao thoa, vi\u1ec7c hi\u1ec3u r\u00f5 v\u1ec1 th\u1eddi gian t\u00edn hi\u1ec7u gi\u00fap ng\u0103n ng\u1eeba c\u00e1c thi\u1ebft k\u1ebf l\u1ea1i t\u1ed1n k\u00e9m v\u00e0 \u0111\u1ea3m b\u1ea3o \u0111\u1ed9 tin c\u1eady.<\/p>\n

                              D\u00f9 b\u1ea1n \u0111ang g\u1ee1 l\u1ed7i giao th\u1ee9c truy\u1ec1n th\u00f4ng, t\u1ed1i \u01b0u h\u00f3a ti\u00eau th\u1ee5 n\u0103ng l\u01b0\u1ee3ng hay \u0111\u1ea3m b\u1ea3o an to\u00e0n trong m\u1ed9t h\u1ec7 th\u1ed1ng quan tr\u1ecdng, nh\u1eefng s\u01a1 \u0111\u1ed3 n\u00e0y cung c\u1ea5p s\u1ef1 r\u00f5 r\u00e0ng c\u1ea7n thi\u1ebft \u0111\u1ec3 \u0111\u01b0a ra quy\u1ebft \u0111\u1ecbnh s\u00e1ng su\u1ed1t. B\u1eb1ng c\u00e1ch t\u1eadp trung v\u00e0o th\u1eddi gian thi\u1ebft l\u1eadp, \u0111\u1ed9 tr\u1ec5 lan truy\u1ec1n v\u00e0 \u0111\u1ed9 to\u00e0n v\u1eb9n t\u00edn hi\u1ec7u, c\u00e1c k\u1ef9 s\u01b0 c\u00f3 th\u1ec3 x\u00e2y d\u1ef1ng c\u00e1c h\u1ec7 th\u1ed1ng ho\u1ea1t \u0111\u1ed9ng \u1ed5n \u0111\u1ecbnh trong \u0111i\u1ec1u ki\u1ec7n th\u1ef1c t\u1ebf.<\/p>\n

                              S\u1ef1 \u0111\u1ea7u t\u01b0 v\u00e0o vi\u1ec7c hi\u1ec3u m\u1ed1i quan h\u1ec7 v\u1ec1 th\u1eddi gian s\u1ebd mang l\u1ea1i l\u1ee3i \u00edch v\u1ec1 \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh v\u00e0 hi\u1ec7u su\u1ea5t. D\u00f9 c\u00f4ng ngh\u1ec7 ph\u00e1t tri\u1ec3n, c\u00e1c nguy\u00ean t\u1eafc v\u1eabn gi\u1eef nguy\u00ean. Th\u1eddi gian l\u00e0 h\u1eb1ng s\u1ed1, v\u00e0 vi\u1ec7c th\u00e0nh th\u1ea1o \u0111o l\u01b0\u1eddng th\u1eddi gian ch\u00ednh l\u00e0 ch\u00eca kh\u00f3a cho thi\u1ebft k\u1ebf nh\u00fang th\u00e0nh c\u00f4ng.<\/p>\n","protected":false},"excerpt":{"rendered":"

                              Trong th\u1ebf gi\u1edbi ph\u1ee9c t\u1ea1p c\u1ee7a k\u1ef9 thu\u1eadt nh\u00fang, \u0111\u1ed9 ch\u00ednh x\u00e1c kh\u00f4ng ch\u1ec9 l\u00e0 m\u1ed9t s\u1ef1 l\u1ef1a ch\u1ecdn m\u00e0 l\u00e0 m\u1ed9t y\u00eau c\u1ea7u b\u1eaft bu\u1ed9c. C\u00e1c s\u01a1 \u0111\u1ed3 th\u1eddi…<\/p>\n","protected":false},"author":1,"featured_media":2013,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_title":"S\u01a1 \u0111\u1ed3 th\u1eddi gian trong h\u1ec7 th\u1ed1ng nh\u00fang: \u1ee8ng d\u1ee5ng th\u1ef1c t\u1ebf","_yoast_wpseo_metadesc":"Kh\u00e1m ph\u00e1 c\u00e1ch c\u00e1c s\u01a1 \u0111\u1ed3 th\u1eddi gian th\u00fac \u0111\u1ea9y thi\u1ebft k\u1ebf nh\u00fang, ph\u00e2n t\u00edch giao th\u1ee9c v\u00e0 g\u1ee1 l\u1ed7i trong c\u00e1c h\u1ec7 th\u1ed1ng ph\u1ea7n c\u1ee9ng. H\u01b0\u1edbng d\u1eabn th\u1ef1c t\u1ebf cho c\u00e1c k\u1ef9 s\u01b0.","fifu_image_url":"","fifu_image_alt":"","footnotes":""},"categories":[60],"tags":[87,92],"class_list":["post-2012","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-unified-modeling-language","tag-academic","tag-timing-diagram"],"yoast_head":"\nS\u01a1 \u0111\u1ed3 th\u1eddi gian trong h\u1ec7 th\u1ed1ng nh\u00fang: \u1ee8ng d\u1ee5ng th\u1ef1c t\u1ebf<\/title>\n<meta name=\"description\" content=\"Kh\u00e1m ph\u00e1 c\u00e1ch c\u00e1c s\u01a1 \u0111\u1ed3 th\u1eddi gian th\u00fac \u0111\u1ea9y thi\u1ebft k\u1ebf nh\u00fang, ph\u00e2n t\u00edch giao th\u1ee9c v\u00e0 g\u1ee1 l\u1ed7i trong c\u00e1c h\u1ec7 th\u1ed1ng ph\u1ea7n c\u1ee9ng. 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