TWI463329B - Method of transmission through single wire - Google Patents

Description

Single transmission line transmission method

The invention relates to a single transmission line transmission method, in particular to a single transmission line transmission method capable of transmitting complex information on a single transmission line by using a simple signal transmission specification.

In many forms of signal transmission specifications, for example, the communication interface commonly used in communication between devices and power management devices in the system includes I2C, SPI, SMBUS, etc., which require at least two transmission lines, one for transmitting data and one for transmission clock. If a single transmission line can be used to balance data and clock transmission, the number of pins can be reduced for the circuit, the signal synchronization between different transmission lines can be eliminated, or the receiving end and the transmitting end clock are not synchronized. Prior art, such as U.S. Patent Nos. 7,276,631 and 7,080,266, propose a single-wire signal transmission method, as shown in Fig. 1, when the receiving circuit detects the rising edge of the EN/SET signal, it is enabled. Receive data (as indicated by the waveform ENABLE), and generate a clock according to the EN/SET signal (as indicated by the clock waveform), and the counter of the receiving circuit starts counting for the rising edge of the EN/SET signal (1~) n). When the receiving end detects the falling edge of the EN/SET signal, it starts to start timing. If the next rising edge is not detected within the time limit, the enable signal Enable is stopped, and the count is reset to zero, and the clock is also Stop.

In the above two cases, the rising edge of the low level rise to the high level is counted, and the number of counts represents the transmission information, so if the value n is to be transmitted, n rising edges must be transmitted. When the value is larger, the more you need The rising edge, the longer the transmission time (or the length of the bit), obviously, the method of the two cases is very inconvenient to use in the transmission of large-value information, and the transmission time (or bit length) is not fixed, in some Application will also cause trouble.

In view of the above, the present invention is directed to the deficiencies of the prior art described above, and proposes a single transmission line transmission method capable of transmitting complex information on a single transmission line by using a simple signal transmission specification.

In one aspect, the present invention provides a single transmission line transmission method, including: receiving a single transmission line signal by a single transmission line; confirming a start code of the single transmission line signal; confirming the start code, at least one During a fixed-length preset bit transmission period, a rising edge, a falling edge, or both of the single transmission line signal is counted to generate a digital number; and the number of times code is decoded to generate transmission information.

In the above single transmission line transmission method, a plurality of preset bit transmission periods can be transmitted, and one bit is represented by each preset bit transmission period.

In another aspect, the present invention provides a single transmission line transmission method, including: transmitting a single transmission line signal to a receiving end circuit by a single transmission line, the single transmission line signal includes: a start code; and each of the plurality of fixed lines is fixed During the preset bit transmission of the length, each preset bit transmission period represents one bit, and has at least one level conversion in each preset bit transmission period to represent a digital number; and an end code.

According to an embodiment of the invention, the start code may be one of the rising edge or the falling edge of the single transmission line signal.

In an embodiment of the present invention, the code may be decoded to 0/1 or 1/0 according to the odd/even number.

In an embodiment of the present invention, the number represented by the carry method of the binary digit or more may be transmitted during the transmission of the preset bit.

In an embodiment of the present invention, the single transmission line signal may further have a transmission end code, and the transmission end code is maintained at a high level or a low level for a predetermined period, wherein the predetermined period of the transmission end code is transmitted from any preset bit. Calculated at the end of the period, or from the rising edge or the falling edge.

In another embodiment of the present invention, the single transmission line transmission method may not have clock information.

In an embodiment of the invention, the transmission information has one or a combination of instructions, addresses, and read and write information.

The purpose, technical content, features and effects achieved by the present invention will be more readily understood by the detailed description of the embodiments.

The above and other technical contents, features and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments. The directional terms mentioned in the following embodiments, such as up, down, left, right, front or back, etc., are only directions referring to the additional drawings. The drawings in the present specification are intended to illustrate the functional relationship between the various devices and the various elements, and the shapes, thicknesses, and widths are not drawn to scale.

A single transmission line transmission method provided by an embodiment of the present invention Included: receiving a single transmission line signal by a single transmission line; confirming a start code of the single transmission line signal; and confirming the start code, for at least one fixed length of the preset bit transmission period, for the single transmission line signal A rising edge, or a falling edge, or both, is counted to produce a digital number; and the number of times code is decoded to produce transmission information.

Referring to FIG. 2, which is a two embodiment of a single transmission line signal received by a receiving end circuit, the two single transmission line signals have a difference, that is, their background levels are different, one is a high background level, and the other is Low background level. The single transmission line signal has a start code SA, which indicates that the transmission is started. The start code SA may be, for example, one of the rising edge or the falling edge of the single transmission line signal, and may of course be a more complicated starting code; The start code SA of the embodiment in the second figure is taken as an example of the falling edge, and the start code SA of the embodiment in the second figure is taken as an example of the rising edge. After the receiving end (not shown) confirms the start code SA, the level shift for the single transmission line signal may be started within the first preset bit transmission period T1 of the fixed length (may be a rising edge, or a falling edge, or Both) count; the two single transmission line signals in the figure are counted for counting the falling edge. The result of the counting can be encoded and decoded in various ways, as described later. The single transmission line signal may have more than one bit, and the single transmission line signal illustrated in FIG. 2 has two bits, which are respectively transmitted during the preset bit transmission periods T1 and T2 (T1 and T2 are both fixed lengths). The single transmission line signal preferably has a transmission end code to indicate the end of the transmission. The transmission end code can use, for example, a time-out mechanism. When the level conversion does not occur for a period of time, the transmission ends. Referring to the top of Figure 2, the transmission end code can be continued after the end of the self-preset bit transmission period A level change is not performed for a predetermined period of time TE, indicating that the transmission ends, or as shown in FIG. 2, after a certain level of transition (one of the rising edge or the falling edge) continues for a predetermined period of time TE' no level change occurs, indicating The transfer ends. In the implementation, the end level can be selected as a high level or a low level, and the setting is subject to actual use.

During the preset bit transmission period, the result of the counting can be regarded as a time code. The digital can be encoded and decoded in various ways, one of which is: decoding it into a binary bit information, for example, a single transmission line. When the count result of the falling edge of the signal is odd, it can be decoded to 0, and when the count result is even, it can be decoded to 1. Of course, it can be arranged that the decoding result is 1 when the counting result of the falling edge of the single transmission line signal is odd, and 0 when the counting result is even. In the two embodiments, in the first preset bit transmission period T1, the counting result of the falling edge of the single transmission line signal is 3, 3 is an odd number, and thus can be decoded to 0, for example. In the second preset bit transmission period T2 in the figure, the counting result of the falling edge of the single transmission line signal is 2, and 2 is an even number, so that the decoding is 0. As such, the single transmission line signal can include binary bit information of 0 and 1. It should be noted that the first and second preset bit transmission periods in this embodiment are for illustrative purposes only, and may be reduced to only one preset bit transmission period or more preset bit transmission periods as needed. It conforms to the technical features of the present invention.

Moreover, the time code can also be encoded and decoded in other manners. For example, in the first preset bit transmission period T1, the counting result of the falling edge of the single transmission line signal is 3, that is, 3 times; for example, 3 times can be defined. To represent an instruction, address, or read or write data, it can also be defined as representing an integer information. For example, the integer 2 (counting 1 time represents the integer 0). In other words, each preset bit transmission period can represent one bit, and each bit is not limited to a binary bit, but can be a number represented by any carry method above the binary. The difference between this and the prior art U.S. Patent No. 7,276,631 and No. 7,080,266 is that, in the present case, the length of the preset bit transmission period is fixed, and the combination of the plurality of bit times code codes can be used to indicate a larger Value. That is, the combination of the number of times T1 and T2 of the two or more preset bit transmission periods can be defined as various meanings, such as a larger value, or a combination of an instruction, an address, and a read/write data.

In practical applications, the count of the single transmission line signal is not limited to the falling edge, and may be counted for the rising edge or both if necessary. Referring to Fig. 3, regardless of whether the background level is a high level or a low level, the counting rising edge, or falling edge, or both can be selected within a fixed time T3. The principle of encoding/decoding, for example, how to define the meaning of the binary combination of 0 and 1, the number of times, and the combination of the number of times, can be derived from the foregoing embodiment.

As can be seen from the above, the present invention can transmit complex information by a single transmission line without the clock information (that is, no clock information is transmitted except for the single transmission line signal). Compared with the prior art, if a large value needs to be transmitted, the transmission time required for the present case is short, and the length of each preset bit transmission period is fixed. If the number of transmitted bits is fixed, the total transmission is performed. Time is also fixed and convenient in application.

In addition, in an embodiment of the present invention, the transmission information may be selectively arranged to have one or a combination of instructions, addresses, and read and write information for performing Signal transmission between devices; for example, in each transmission, the instruction is represented by the first to mth bits, and the (m+1)~(m+1+n) bits represent the address, the first ( m+1+n+1)~(m+1+n+1+p) bits represent read/write information and the like.

The present invention has been described with reference to the preferred embodiments thereof, and the present invention is not intended to limit the scope of the present invention. For those skilled in the art, various equivalent changes can be immediately considered within the spirit of the invention. For example, the start code is designated as two consecutive rising edges, or the transmission end code is designated as a combination of a rising edge and a falling edge, etc., all in accordance with the features of the present invention. The implementation of the present invention is not limited to small portable electronic devices or large size devices. Equivalent changes or modifications of the concept and spirit of the invention are intended to be included within the scope of the invention.

EN/SET‧‧‧ single transmission line signal

ENABLE‧‧‧Enable Waveform

SA‧‧‧ start code

T1, T2, T3‧‧‧ Preset bit transmission period

TE, TE’‧‧‧ Schedule

Figure 1 shows the prior art single line sequence transmission.

Figure 2 shows two single transmission line signals in accordance with an embodiment of the present invention.

Figure 3 shows the relationship between the rising edge and the falling edge of a single transmission line signal.

SA‧‧‧ start code

T1, T2‧‧‧ Preset bit transmission period

TE, TE’‧‧‧ Schedule

Claims (13)

A single transmission line transmission method includes: receiving a single transmission line signal by a single transmission line; confirming a start code of the single transmission line signal; and confirming the start code, after transmitting at least one preset bit having a fixed length Generating a digital number for the rising edge, or falling edge of the single transmission line signal, or both, and decoding the number of times to generate transmission information, wherein the number of bits to be transmitted is predefined. The single transmission line transmission method of claim 1, wherein the start code is one of a rising edge or a falling edge of the single transmission line signal. The single transmission line transmission method according to claim 1, wherein a plurality of preset bit transmission periods are transmitted, and one bit is represented by each preset bit transmission period. The single transmission line transmission method according to claim 1, wherein the decoding is 0/1 or 1/0 according to the odd/even number of the times code. The single transmission line transmission method according to claim 1, wherein the digit represented by the carry method of the binary digit is transmitted during a preset bit transmission period. The method for transmitting a single transmission line according to claim 1, wherein the single transmission line signal further has a transmission end code, and the transmission end code has a high level or a low level for a predetermined period, wherein the transmission end code is The predetermined period is calculated from the end of any preset bit transmission period, or from the rising edge or the falling edge. The single transmission line transmission method of claim 1, wherein the transmission information has one or a combination of an instruction, an address, and a read/write information. A single transmission line transmission method includes: transmitting, by a single transmission line, a single transmission line signal to a receiving end circuit, the single transmission line signal comprising: a start code; and a plurality of preset bit transmission periods each of which is fixed length, each A predetermined bit transmission period represents a bit, having at least one level conversion during each preset bit transmission period to represent a digital number; and an end code in which the number of bits to be transmitted is predefined. The single transmission line transmission method of claim 8, wherein the start code is one of a rising edge or a falling edge of the single transmission line signal. The single transmission line transmission method according to claim 8, wherein the number of times is odd/even and 0/1 or 1/0 of the binary is represented. The single transmission line transmission method of claim 8, wherein the digit represented by the carry method of the binary digit is transmitted during a preset bit transmission period. The single transmission line transmission method according to claim 8, wherein the transmission end code has a high level or a low level for a predetermined period of time, wherein the predetermined period of the transmission end code ends from any preset bit transmission period. Calculated from the time, or from the rising edge or the falling edge. A single transmission line transmission method as described in claim 8 of the patent application, The transmission information has one or a combination of instructions, addresses, and read and write information.