TWI271958B - Transmitting apparatus of serial transmission - Google Patents

Abstract

A transmitting apparatus of serial transmission uses a 4-impulse amplitude of vibration modulation transmitting code in the differential 4-impulse amplitude of vibration modulation transmitting system. The transmitting code retains advantage of 8B/10B transmission such as direct current balanced bit serial data and providing sufficient chronological order data for receiving terminal to recover the chronological order. Having function of lowering jiggle of data transform boundary generated by recovering chronological order. Consuming half of bandwidth of 2-impulse amplitude of vibration modulation signal when it is used in the differential 4-impulse amplitude of vibration modulation transmitting system. It can be applied to high speed transmission interface and IC design.

Description

1271958 IX. Description of the invention: [Technical field of the invention] The present invention relates to a transmission device for serial transmission, in particular to a serial transmission system for a differential 4-pulse amplitude modulation signal, which is effective Reduces the characteristics of the data transition boundary jitter produced by the clock recovery. ^ I [Prior Art] In the serial connection data communication process, the data clock is not transmitted with the data. The local clock generated at the receiving end, the phase interference caused, or the phase alignment problem existing in the clock sampling, when there is high-speed data, there is also the problem of the bump transition boundary jitter, and the above problems will affect > Performance of the overall system. Therefore, clock generation and timing recovery at the receiving end are very important and critical functions for a high speed transmission signal system. The data transmission mechanism using 8B/10B encoding has become the standard for the transmission of serial transmissions in the south. It is a 4 knives of the actual hardware layer and may be used for any Gigabit Ethernet, Gigabit Ethernet, Gigabit 5 1271958

Ethernet) 'Automatic Teller Machine (ATM), wireless or fiber optic transmission link. It contains continuous encoding and decoding rules, special instructions and error reconnaissance capabilities to communicate with the data connection layer. According to its coding mechanism, it can generate the DC balance of the bit string 歹J shell material 'mainly because this bit string data contains the same number of positive and negative pulses, and the purpose of DC balance, mainly to avoid the AC handle The distortion of the signal. The timing information is provided, and at least two data transmissions are converted to the receiving end for timing recovery, and the possibility of detecting single or multiple errors generated during the data transmission period is increased. Although the above-mentioned conventional techniques can achieve high-speed serial transmission, the data switching boundary jitter generated when the clock is recovered cannot be reduced, and every 10 bits transmitted, there is a fixed data conversion to provide the receiver with fast timing synchronization. Therefore, the user can not meet the needs of the user in actual use. [Inventive content] Therefore, the main object of the present invention is to use a transmission code 甩 to a string of 4 脉冲 pulse amplitude modulation signals. The column transmission system, which reduces the characteristics of the data generated by the clock recovery when the clock is restored to I271958. For the purpose of the above, the present invention is a transmission device for serial transmission, wherein the transmission code is a heart pulse amplitude modulation symmetric transmission code, and is formed in the series of the differential 4_pulse amplitude modulation signal. a transmission system comprising at least one or more 4_pulses: a U-modulation symmetric coding device, a transmission device, and a transmission medium

a receiving device, a timing recovery device and at least one 4-pulse amplitude modulation symmetric decoding device. [Embodiment]

The spray is shown in Fig. 1 and is a schematic diagram of the serial transmission system architecture of the differential 4·pulse amplitude modulation signal of the present invention. As shown in the figure, the serial transmission system architecture of the differential 4-pulse amplitude modulation signal includes at least one of 4_pulse amplitude modulation symmetric coding devices la, lb, a transmission device 2, and a transmission interface 3. A pick-up device 4, a time-series recovery device 5, and 4 _ pulse amplitude modulation symmetric decoding devices 6a, 6b. The transmission method is to input a 16-bit parallel data, and the 16-bit parallel data is divided into a most significant bit data and a least significant bit data. Where the most significant bit 7 1271958

The data and the least significant bit are octets, respectively, which are wheeled into the 4-pulse-amplitude amplitude modulation symmetric coding device, and coded and obtained a 10-bit data, and input to the transmission 2 Device 2. The transmitting device 2 includes a modulation device with a heart pulse amplitude modulation = modulated into a plurality of sets of differential 4_pulse amplitude modulation signals. The differential 4-pulse amplitude modulation signal has a 1 〇 group and is transmitted to the receiving device 4 via the transmission interface 3. The receiving device 4 includes a 4-pulse amplitude modulation demodulation device, and the differential 4-pulse amplitude modulation signal is demodulated into a 2-bit data and input to the timing recovery device 5, After the bit data is converted by the data, the 20-bit data is divided into 1 bit data and 10-bit data is input to the 4-pulse amplitude modulation symmetric decoding device 6a, 6b for decoding, and each 8-bit element is obtained. Negative material 'combined into 16-bit data output. The eye is shown in the "Fig. 2", which is a flow chart of the coding method of the present invention. As shown in the figure: input an 8-bit data for encoding 'This encoding method includes the following steps · Step (a) 11 · Enter an 8-bit data, and cooperate with rst, int-rd-val[l:〇] , int-rd-η and K-char signal (k-char signal) and other signals; 8 1271958 code or ... meta-signal value for signal judgment ' ·,,, then the 8-bit data is a special control code 'K The character signal value is 〇, then the 8-bit data code;

The amount of difference generated by the encoding; (4) (4) 13: If a special control code is used, the 8-bit data is encoded, "the 8-bit data and an initial difference amount are encoded via a K-character lookup rule ^signal", Output is -1G bit data and -8 bit data

Step (4) 14a: If the data code is the data code, the 8-bit data is divided into -5 bit data and a 3-bit data, respectively, and the code is respectively encoded. 'The 5-bit data and an initial difference amount are checked by an abcdei-l00k_up table. The rule is encoded, and the output is a difference S generated by a 6-bit data and a 5-bit data encoding, wherein the difference generated by the 5-bit data encoding is used as the difference between the 3-bit data encoding Reference to the value; Step (e) 14b: The difference between the 3-bit data and the 5-bit data encoding is encoded by a fghj_1〇〇k_up 9 1271958 table lookup rule, and the output is -4 The amount of difference between the bit data and a 3-bit data encoding. The difference generated by the 3-bit data encoding is the difference amount generated by the 8-bit data encoding; Step (f) 15: After encoding, the ι-bit data and the 8-bit are output by the final integration unit. The amount of difference produced by the metadata encoding. The difference amount generated by the 8-bit data encoding is a reference to the difference amount of the data encoding of the next group. (As shown in Fig. 2, the difference is connected by a connection symbol 16 which represents that the difference amount of the output can be fed back to the next set of decoding difference amounts) The data output of the last integrated unit It is judged by the K character signal. If the K-character signal value is 丨, the output is the output of step (c) 13; if the K-character signal value is 〇, the output is the output of step (d) 14a and step (e) i4b . The difference quantity output 'the initial difference quantity is preset to 〇〇(_〗), and if the int_rd_n signal value is 〇, the input int_rcj_vai signal value is changed internally to the difference amount, Otherwise, the difference amount generated by the encoding of the step (c) 13 or the step (d) 14a and the step (e) i4b is output. 1271958 The above step (b) 12' The 4_pulse amplitude modulation signal serial transmission system has 256 groups of codes corresponding to the data 蹲 definition, and 12 groups of codes corresponding to the special control code definition, the coding system is The communication signal between the physical layer and the data connection layer.

Work 砥 y ^ (〇 U14a and step (e) 14b, input the 8 π π data into 10-bit data, the output octet data is the 6-bit data output in step (4) 14a and the 4-bit output in step (4) i4t The metadata is combined. The 6-bit data and the 4-bit mussels are two sets of output units, and the difference between the number of bits! and the number of bits contained in each set of output units can be ±2 and (4) as +2 means that in the output unit group, the bit is more than the number of the bit 0. The number of bits i and the number of bits 0 in the output unit [Definable difference amount The difference between the number of bit 1 and bit 0 contained in the output unit is '〇, ±2. The output unit compensates for the bit & 1 and bit G of the previously transmitted bit. The difference or the original value is maintained. The output unit compensates for the difference between the previously transmitted bit! and the number of bits ' 'The difference will fall between ±1 and ±3 as: out unit and other-output unit The bit 1 and the bit of the group; the index of balance. 兀〇1271958, 〇月, see "Fig. 3", which is the machine diagram of the method of solving the stone horse in the present invention. Shows: input - Profile de mother, based decoding method comprising the following steps: Step (A) 61: inputting a 1〇 bit data, and with

(8) lnt~rd-Val[1:〇] and int-r<Ln and other signals, and simultaneously perform a data decoding path and a fault extraction and special control code discrimination path; Step (B) 62a: Perform the data decoding path At the time, the summer bit data is divided into - 6 bit data and - 4 bit data, and the line decoding, the $6 bit data is decoded by an EDCBA-^ table lookup rule, and the output is -5 bit data and _ 6-bit data decoding to produce the difference, the 6-bit half

The amount of difference produced by the decoding is a reference to the difference side of the next set of decodings. Step (C) 62b: The 4-bit data of Yanhai and the difference amount generated by the decoding are decoded by a HGFj〇〇k-up table check rule, and the output is -3 bit data and -4 bit data. Decode the amount of difference produced. The difference generated by the decoding of the 4-bit data is the difference generated by the decoding of the 10-bit data. 12 1271958 ^ joj Whether there is an error; whether it is in accordance with the principle of the transmission code by the -any one (10) rJ〇〇kup table rule. When an error is found, an error signal is issued. The error signal value is 1; when no error occurs, the error signal is 〇. ^Jiyang 631) ·When the special control code is used to identify the path, it is judged whether the data is the special control drink; whether it is the special control code through a k~charJ〇gic table check rule, when the data is special control When the code is issued, a K-character signal is sent, then the K-character is numbered, and β is a value of 1. If the data is a data code, the value of the Κ character signal is 〇 step (completed in the above steps) After the final integration unit, the difference amount generated by the decoding of an 8-bit data and a 1-bit data, an error signal, and a "meta signal. The decoding difference generated by the decoding of the 1-bit data The reference (such as the first = feedback to the next group of data, check the abundance ~ % as shown in Figure 3) the difference is connected by the connection 唬 65, the connection of the connection of the number 65 represents the output ... grants the next set of difference values for the mother.) The output of the difference between the 0 bits of the data is decoded. The initial difference is 1271958. The pre-quot; is 〇〇(ββ1), if the int_rd— If the value of the n signal is 〇, input the int- rd-val signal value to modify the internal difference, and then output the step (B) 62a and Step (C) 62b encodes the difference amount generated by the code. See the "Fig. 4" in May, which is a graph of the relationship between the unit difference amount and the bit interval of the present invention. The difference is the relationship between the bit 1 of the balanced data transmission and the finger cup of the bit ' and can define a unit difference and the bit interval. When the transmitted bit is bit 1, the relationship curve Then it rises by 45 degrees and differs from the starting point by a total number of changes, and the accumulated difference is the difference of the starting point plus one. When the transmitted bit is the bit 〇, the relationship curve decreases. 45 degrees, and a difference of the total number of changes from the starting point, the accumulated difference is the difference of the starting point minus one. The maximum number of vertical digits of the unit is 7 and the maximum range is 2. Figure 5 shows the relationship between the overall difference and the bit transfer of the present invention. As shown in the figure, the relationship between the unit difference and the bit interval can be developed as the overall difference and The relationship curve of bit transfer is the difference and bit of 6-bit output unit and 4-bit output unit respectively 14 1271958 is composed of a relationship curve. At the boundary between the 6-bit output unit and the 4-bit round-out unit, the vertical digital sum total variation is a large range of 6, and the difference is ±1 and soil. 3. Each bit has a fixed code and bit order 81. In each of the 1 bit output data, a set of symmetric data conversion boundaries 83 is fixed between bit 3 and bit 2. For every 8 bits transmitted on a bit transfer, at least the transfer of the bit 1 and the bit 〇

The transition boundary has a series length (_length) 82 of 8. The symmetric data conversion boundary 83 can provide timing information of the receiving device for timing recovery, and provides sufficient timing information, and each transmission of 8 bits of 70 data is at least - data conversion to the receiving end, reordering, and replying. Wherein, the vertical digit sum variation range: and indicates that the overall bit transmission system converges to a fixed range ^ vertical digit sum variation, and (4) the transmission code can be transmitted by the balance bit it, the bit i and the bit Q The number reaches the characteristics of the DC balanced transmission code. μ See “Figure 6” for the three data conversion boundary diagrams of the differential 4_pulse amplitude modulation signal transmission of the present invention. As shown in the figure, the system contains type-93, type II 94 and H-95 data conversion boundary types. A curve system 15 1271958 is a differential 4-pulse amplitude modulation signal transmission curve 91, and the other line is a corresponding differential 4 _ pulse amplitude modulation signal transmission curve, line 92. Please refer to Figure 7 for the following: The comparison chart of the type 1 data and the type 2 data conversion is as shown in the figure: the data conversion boundary containing the pattern type 93 and the type 2% The 100 type state includes a differential 4_pulse Lu amplitude modulation signal transmission curve 91 and a corresponding differential 4_pulse amplitude modulation signal transmission curve 92. The type 93 has a symmetric data conversion boundary. 1〇〇, the symmetric data conversion boundary 100 is formed by the differential 4-pulse amplitude modulation signal transmission curve 91 and the data conversion boundary 1〇〇 intersecting at a point in the data conversion time 101, and converted according to the data. Boundary 100 provides reference information for correct timing recovery. The signal serial transmission system of the differential pulse modulation is a coding rule using a 4_pulse amplitude modulation symmetric transmission code, and at least 10 sets of symmetric data conversion boundaries are guaranteed for each transmission of 10 signals. . If timing feedback is performed at the receiving end, the timing information provided by the symmetric data conversion boundary 100 is considered, and the timing information of the reference can be effectively improved when the timing is restored. The boundary jitter is ±25%. 2, can also change the clock transition boundary jitter returned by 1271958. . See the "8th and 9th drawings" for the month, which is the timing conversion information map provided by the transmission horse of the present invention and the timing synchronization information provided by the transmission code of the present invention. As shown in the figure: the system contains a set of most significant bits lu and a set of least significant bits 1 (as shown in Figure 8). One 8-bit data is encoded into one-bit 121 data. For each 10-bit 121 data, bit 3 and bit 70 2 have a fixed code, and the fixed code is (1, 〇) or (〇, 1). After being modulated into a differential 4_pulse amplitude modulation signal, a symmetric data conversion pattern of symbol 3 and symbol 2 can be obtained among the transmitted 10 symbols, ensuring that at least one symmetric data conversion boundary exists for every 10 symbols transmitted. . There is a set of (丨, 0) or (〇, 1) data conversions for each transfer bit 121 fixed, and the fixed occurrence occurs every 10 bits of 121 for one cycle (as shown in Fig. 9). § Hai fixed coded bit position has a fixed coding rule, and indicates that there is a fixed synchronization timing information to provide fast synchronization of the receiving end. Please refer to the "1st and uth diagrams" for the differential 4_pulse amplitude modulation of the present invention. The boundary map of the random data conversion and the difference of the present invention _ 4_pulse vibration = modulation signal only consider the symmetry Data conversion boundary Yates 17 17271958 shows the use of -4 _ pulse amplitude modulation (four) system simulation of the differential 4-pulse amplitude modulation signal random data conversion boundary and the 4-pulse amplitude modulation signal only consider symmetry Data conversion boundary map. In summary, the transmission device for serial transmission of the present invention can effectively improve various disadvantages of the conventional use, and can be used for the signal serial transmission system for the differential amplitude modulation of the differential heart to achieve effective reduction of clock recovery. The resulting data is converted to boundary jitter and provides fast timing synchronization at the receiving end, while maintaining the tradition

The transmission advantages of the 8B/10B transmission code, in turn, make the creation of this creation more progressive, more practical, and more in line with the needs of the user. It has indeed met the requirements for the creation of a patent application, and has filed a patent application according to law. _ Huai above is only a comparative example of this creation, and Tian Tian cannot limit the scope of this creation. Therefore, the simple equivalent changes made by the scope of the patent application and the content of the creation manual are Modifications shall remain within the scope of this Creative Patent. 1271958 [Simplified description of the drawings] Fig. 1 is a schematic diagram showing the architecture of a 4-pulse amplitude modulation transmission system of the present invention. Figure 2 is a flow chart of the encoding method of the present invention. Figure 3 is a flow chart of the decoding method of the present invention. Fig. 4 is a graph showing the relationship between a unit difference amount and a bit interval of the present invention. Fig. 5 is a graph showing the relationship between the overall difference amount and the bit transfer of the present invention. Fig. 6 is a schematic diagram showing two types of data conversion boundary states of differential 4_pulse amplitude modulation signal transmission of the present invention. Fig. 7 is a comparison diagram of the data of the type 1 and the type 2 data of the present invention. Figure 8 is a symmetrical conversion boundary diagram provided by the transmission code of the present invention. Figure 9 is a timing synchronization information diagram provided by the transmission code of the present invention. Figure 10 is a diagram showing the random data conversion boundary of the differential 4_pulse amplitude modulation signal of the present invention. In Fig. 11, the differential 4-pulse amplitude modulation signal of the present invention only considers the symmetric data conversion boundary circle. 1271958 [Description of main component symbols] 4-pulse amplitude modulation symmetrical coding device la, lb Step (a) 11 Step (b) 12 Step (c) 13 Step (d) 14a Step (e) 14b Φ Step (f) 15 Connection symbol 16 Transmission device 2 Transmission interface 3, receiving device 4 Timing recovery device 5 φ 4-pulse amplitude modulation symmetric decoding device 6a, 6b Step (A) 61 Step (B) 62a Step (C) 62b Step (D ) 63a Step (E) 63b Step (F) 64 20 1271958 Connection symbol 65 Unit vertical digit sum change amount 7 ... Bit order 81 Serial length 82 Symmetric data conversion boundary 83 Differential 4-pulse amplitude modulation signal transmission curve 91 corresponding differential 4_ pulse amplitude modulation signal transmission curve 92 type one 93 type two 94 type three 95 data conversion boundary 1 data conversion time 101 25% data conversion time 102 • most significant bit 111 Least significant bit 112 10 bits 121 21

Claims (1)

1271958 Patent application garden: a transmission shock pulse amplitude modulation signal serial transmission system for serial transmission, which comprises at least: 4: pulse amplitude modulation symmetric coding device, used to Parallel data input for editing; : Transmitting device' includes a 4_pulse tunable modulation device. The data is modulated into multiple sets of differential 4_pulse amplitude modulation signals; pulse amplitude modulation-transmission interface Receiving the plurality of sets of differential 4· signals; the receiving device includes a 4_pulse amplitude modulation: receiving the plurality of sets of differential 4_pulse amplitude modulation signals into the second variable demodulation and transposition modulation; The recovery device, the data of the demodulation and transformation of the system is used for timing recovery; and at least one or more of the 4 _ amplitude-to-amplitude symmetrical decoding is decoded by the time-recovery data. 2. According to the first paragraph of the patent scope of the application, the extension device for the serial transmission wheel, 1 , 兮 m m 丄 丄 丄 中 该 该 该 该 该 该 该 该 该 该 该 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 8-bit data; (b) judging that the 8-bit data is a special control code or a data code; 'widely for the special control, the 8-bit data and an initial difference amount are encoded; (4) if the The data code 'the 8-bit data and the -3 digit data, the 5-digit data and _; the beginning: # value to encode; (4) the step (4) the 3-bit data and a 5-bit data generated The difference amount is encoded; (f) the difference amount generated by encoding the -ig bit data and an 8-bit data after the final integration unit is encoded. The device for serial transmission described in the item of the patent of Lu H., wherein the decoding method comprises the following steps: (4) inputting -10 bits of data, and simultaneously performing - data decoding teaching and an error After detecting the data with the special control code; (B) when decoding the data (4), the (4) bit data is divided into -^ bit data and -4 bit data, the 6-bit data and an initial difference amount are performed. (6) According to the above step (8), the difference between the 4 bits (4) and the 6-bit data solution 23 1271958 code is solved; (D) When the error detection is performed, the 10-bit error is judged; (F) After the completion of the step, the final integration of the bit data, one turn of the position to get an 8 70 Whether the data is wrong or not. The payment method is used to identify whether the light material is the special control code; the difference between the quantity and the two materials is the wrong block nickname and a κ character signal. 4. According to the second paragraph of the patent application scope, in the serial transmission transmission device ~, the output 10-bit data is composed of 6-bit resources and 4-bit data. 5. The transmission device for serial transmission according to item 2 of the patent application scope, wherein the difference generated by the input of one 8-bit data is feedbackable as the next group of code difference values. Reference. 6. The transmission device for serial transmission according to claim 3, wherein the difference amount generated by the input of a 10-bit data is feedbackable as a difference of the next set of decoding. Volume of the reference 24 1271958 test. According to the fourth aspect of the patent application scope, the transmission device for the vehicle-to-vehicle φ column transmission wheel, wherein the 6-bit data and the 4-bit material coarse-fed material are two sets of rotating units. 8. Transmission for serial transmission as described in item 7 of the patent application scope The difference between the number of bits and bits contained in each of the output units of the device 'where' may be 〇, ± 2 or ± 4. 9. The transmission device for serial transmission according to item 8 of the patent application scope, wherein the difference between the number of bits i and the bit 〇 contained in the output unit can define a difference letter The difference is set to ±1 and ±3, and the difference can be used as an indicator of the bit 1 and bit 0 of the balanced data transmission. 10. According to item 9 of the patent application scope ^ ^ Transmission device for serial transmission 'where the index of bit 1 and bit 0 of the data transmission of Feng Qianheng in the difference amount can define the difference value of the early morning position And the relationship between the bit intervals. The 25 1271958 transmission device for serial transmission according to Item 10 of the patent application scope, wherein the relationship between the unit difference value and the bit interval is when the transmitted bit is bit 1 The relationship curve rises by 45 degrees and differs from the starting point by a total number of changes. The accumulated difference is the difference of the starting point plus one. When the transmitted bit is the bit ,, the relationship curve Then it drops by 45 degrees and is different from the starting point by a total number of changes. The accumulated difference is the difference of the starting point minus one. The transmitting device for serial transmission according to the first aspect of the patent application, wherein the relationship between the unit difference amount and the bit interval is a relationship between the overall difference amount and the bit transmission. Curve 0 13 is a transmission device for serial transmission according to claim 12, wherein the relationship between the overall difference and the bit transmission is output by a 6-bit output unit and a 4-bit output, respectively. The difference between the unit and the bit transfer curve. 14. Applying the transmission device for serial transmission described in item 12 of the patent scope, wherein the relationship between the overall difference and the bit transfer 26 1271958 is in a 6-bit output unit and a 4-bit wheel. Out of the boundary of the unit, its vertical...the maximum number of changes in the sum of the digits is 1 and the difference is 1 and 3. According to the transmission device of the serial transmission according to item 12 of the patent application scope, the output data of each of the total difference amount and the bit transmission relationship is between the bit 3 and the bit 2 Fixed a set of symmetric data transition boundaries. According to the transmission device for serial transmission described in claim 12, wherein 'the overall difference amount and the bit transmission relationship curve, at least 8 bits are transmitted, at least the group bit is transmitted The conversion boundary between ι and bit 0 has a speed string length of 8. 17. The transmission device for serial transmission according to item 14 of the patent application scope, wherein when the vertical digital sum variation maximum range is 10, the overall bit transmission converges to a fixed range of digital total variation Among them. 1 according to claim 15 of the patent scope of the transmission 27 17271958 for serial transmission, wherein each of the output data of the bit is fixedly encoded in the bit 3 - and the bit 2 ( 1, 〇) or (〇丨), #, 二 becomes differential 4·pulse amplitude modulation signal, the symmetric data conversion pattern of symbol 3 and symbol 2 can be obtained in the transmitted symbol and there is at least one symmetry Data conversion boundary. #19. According to the scope of the patent scope, the serial transmission is used for the serial transmission, wherein the per-1G bit is a period, and the transmission of one bit signal is fixed and existing. Timing information. 28 1271958 VII. Designated representative map: (1) The representative representative of the case is: (1). (2) Brief description of the component symbols of the representative diagram·· 4-pulse amplitude modulation symmetric coding device la, lb transmission device 2 transmission interface 3 receiving device 4 timing recovery device 5 B 4-pulse amplitude modulation symmetric decoding device 6a, 6b VIII. If there is a chemical formula in this case, please reveal the chemical formula that best shows the characteristics of the invention: