TWI542998B - Data transmission method for sgpio - Google Patents

Description

Universal serial input and output data transmission method

The present invention relates to a data transmission method for universal serial input and output, and more particularly to a data transmission method between an expander and a target device connected by a universal serial input/output bus.

With the development of technology, the demand for data transmission speed and data volume between electronic devices has also grown. In order to quickly transfer a large amount of data between electronic devices, the current technology generally uses a general serial input/output (SGPIO) bus or an integrated circuit (I ² C). The Universal Asynchronous Receiver Transmitter (UART) performs data transmission between an expander or an Initiator and a Target.

However, when the data transmission between the expander and the target device is performed by the universal serial input/output bus, the existing universal serial input/output bus architecture pre-allocates and defines a certain number of time slots (timeslot). The target device, the target device transmits the corresponding data content from the defined time slot to the expander according to the defined time slot. As a result, the number of pre-allocated and defined time slots limits the amount of data that the target device transmits to the expander. For example, if 60 time slots are defined in advance for the target device to transmit data to the expander, the target device can only transmit 60 different data contents to the expander, and no more data can be added.

The present invention provides a data transmission method for universal serial input and output, thereby solving the problem that the amount of data transmitted by the target device in the prior art is limited.

The universal serial input and output data transmission method disclosed in the present invention is applicable to an expander and a target device connected by a universal serial input/output bus. The universal serial input/output bus has at least a data output line and a data read line. The expander outputs a paging indication signal to the target device via the data output line, and the paging indication signal indicates the paging address. The target device searches for the paging data indicated by the paging address according to the paging indication signal. The target device outputs the paged address and the paging data to the expander via the data read line. The expander reads the content transmitted via the data reading line. The expander receives the paging material when the expander determines that the content transmitted by the data read line has a paged address.

According to the data transmission method of the universal serial input and output disclosed by the present invention, the expander actively outputs the paging indication signal to the target device, and the target device further divides the paging under the paging address according to the paging address indicated by the paging indication signal. The data is transmitted to the spreader to increase the amount of data that the target device transmits to the expander through the universal serial input/output bus. When a part of the expander or target device does not support the transmission interface such as I ² C or UART, the communication can be realized by the universal serial input/output bus between the expander and the target device.

The above description of the disclosure and the following description of the embodiments of the present invention are intended to illustrate and explain the spirit and principles of the invention, and to provide further explanation of the scope of the invention.

The detailed features and advantages of the present invention are set forth in the Detailed Description of the Detailed Description of the <RTIgt; </ RTI> <RTIgt; </ RTI> </ RTI> </ RTI> <RTIgt; The objects and advantages associated with the present invention can be readily understood by those skilled in the art. The following examples are intended to describe the present invention in further detail, but are not intended to limit the scope of the invention.

1 is a schematic diagram of a universal serial input/output bus bar electrical connection expander and a target device according to an embodiment of the invention. FIG. 2 is a schematic diagram of an embodiment of the present invention. FIG. 3 is a flow chart showing the steps of a data transmission method for universal serial input and output according to an embodiment of the invention. As shown in the figure, the data transmission method of the universal serial input and output of the present invention is applicable to an expander 20 and a target device (target) connected by a general-purpose serial input/output (SGPIO) bus bar 10. ) 30. The expander 20 is, for example, a serial small computer system interface extender, a microprocessor, an embedded controller, a baseboard management controller (BMC), or other suitable device. The target device 30, such as a backplane module and a disk array device, includes a hard disk, a backup battery, a control unit and a fan, a Just Bundle Of Disks (JBOD) large hard disk array group, and a stand-alone hard disk. Redundant Array of Independent Disks (RAID) large hard disk array group, Programmable Logic Device (PLD), Complex Programmable Logic Device (Complex PLD, CPLD), Field Programmable Gate Field-programmable gate array (FPGA) or other suitable device.

The universal serial input/output bus 10 has a data output line SDataOut, a data read line SDataIn, a clock signal line SClock, and a load signal line SLoad. The expander 20 and the target device 30 respectively have corresponding clock pin, load pin, data input pin and data output pin. The pin corresponding to the expander 20 and the target device 30 are respectively connected by a universal serial input and output. The data output line SDataOut, the data read line SDataIn, the clock signal line SClock, and the load signal line SLoad of the row 10 are electrically connected. The expander 20 is defined as the SGPIO initiator of the universal serial input/output bus 10, and the target device 30 is defined as the target of the universal serial input/output bus 10 (SGPIO Target). A person skilled in the art should understand the connection between the universal serial input/output bus bar 10, the expander 20 and the target device 30, and details are not described herein.

The clock signal line SClock of the universal serial input/output bus 10 is used to provide the expander 20 to transmit the clock signal to the target device 30, and the load signal line SLoad provides the expander 20 to transmit the load signal to the target device 30, and the data output line SDataOut The expander 20 is provided to transmit a signal to the target device 30, and the data read line SDataIn provides the target device 30 to transmit a signal to the expander 20. The clock signal is used to define the transmission clock of the universal serial input/output bus. The load signal is a frame for defining the data output line SDataOut or the data read line SDataIn to transmit data. For example, a transmission frame is a load signal that is triggered for 8 clock cycles to the falling edge of the clock waveform after the rising edge of the clock waveform.

When the expander 20 and the target device 30 transmit data through the universal serial input/output bus 10, in step S401, the expander 20 outputs a page indication signal to the target device 30 via the data output line SDataOut, which is indicated by the page indication signal. A paged address. In step S403, the target device 30 searches for the paging material indicated by the paging address according to the paging instruction signal. In step S405, the target device 30 outputs the paged address and the paging material to the expander 20 via the material read line SDataIn. In step S407, the expander 20 reads the content transmitted via the material reading line SDataIn. In step S409, when the expander 20 determines that the content transmitted by the material reading line SDataIn has a paging address, the expander 20 receives the paging material.

In more detail, the universal serial input/output bus 10 first allocates a plurality of time slots of the data output line SDataOut and the data read line SDataIn. For example, eight time slots in the data output line SDataOut are allocated to transmit the paging instruction signal, and eight time slots in the data reading line SDataIn are allocated to transmit the paging address, and another eight time slots are used to transmit the paging in the paging address. data. In a practical example, the expander 20 is a microprocessor and the target device is a CPLD. When data is to be transferred between the microprocessor and the CPLD, the microprocessor first transmits the data output line SDataOut 8 times. The slot transmits a paging indicator to the CPLD to instruct the CPLD to provide the data content required by the microprocessor. When the CPLD receives the paging instruction signal, the CPLD switches to the paging under the paging address according to the paging address indicated by the paging indication signal, and uses the paging data under the paging address and the paging address together by the data reading line. SDataIn is passed to the microprocessor.

In the present embodiment, the paging instruction signal is an 8-bit signal, so 8 time slots are allocated for transmission. The data read line SDataIn is matched with the 8 bits of the paging indication signal, and 8 time slots are allocated to the CPLD to transmit the paging address, and the other 8 time slots are provided to the CPLD to transmit the paging data.

Accordingly, the microprocessor actively requests data from the CPLD and specifies the required data content through the paging instruction signal, instead of transmitting the data directly to the microprocessor by the CPLD, the CPLD and the microprocessor can transmit. The content of the information is more diverse. For example, when the CPLD transmits data to the microprocessor through the 16 time slots of the data read line SDataIn, only 16 pieces of data can be transmitted to the microprocessor. The microprocessor actively requests data from the CPLD, and transmits the paging instruction signal and the eight time slots of the data reading line SDataIn through the eight time slots of the data output line SDataOut to transmit the paging data. The CPLD can provide 8×. 2 ⁸ or more pieces of information to the microprocessor.

That is, the CPLD 2 8 × ⁸ data, classified data to each of 8 pens ²⁸ pagination addresses when the microprocessor receives CPLD active in claim ²⁸ wherein a page address in the address pagination When paging data, the CPLD transmits the paging address requested by the microprocessor and the eight data under the paging address to the microprocessor from the 16 time slots of the data reading line SDataIn. In other embodiments, the CPLD may have more or less data under each page address, for example, when the CPLD has 16 paging materials under one paging address, when the microprocessor requests the CPLD to provide the paging. When paging data under the address, the CPLD batches 16 paging data to the microprocessor. In other words, the CPLD can transmit 16 paging data under the paging address to the microprocessor through two transmissions.

In this embodiment, the CPLD can output all the paging data under the paging address to the microprocessor one time or batch according to the paging indication signal output by the microprocessor. In other embodiments, the microprocessor can also pass through the microprocessor. In other suitable manners, the paging data of the lower portion of the CPLD output page is specified, for example, the other time slot transmission request signal is assigned to be specified, which is not limited in this embodiment. Moreover, the embodiment does not limit the data having the same number of pens under each paging address. Those having ordinary knowledge in the technical field can configure the amount of paging data under the paging address according to actual needs. In addition, in the foregoing embodiment, the number of time slots for transmitting the paging indication signal by the data output line SDataOut and the number of time slots for transmitting the paging address and the paging data in the data reading line SDataIn are for convenience of explanation, and are not limited thereto. Other possible embodiments of the invention are found.

In order to more clearly illustrate the data transmission method of the universal serial input and output of the present invention, another embodiment will be described. Please refer to FIG. 1 and FIG. 4 together. FIG. 4 is a general string according to another embodiment of the present invention. Flow chart of the steps of the data transmission method of line input and output. As shown in FIG. 4, in step S401, the expander 20 outputs a page indication signal to the target device 30 via the data output line SDataOut according to the clock signal and the load signal. In other words, the expander 20 depends on the period of the clock signal and the load signal. The signal frame transmits a paging indicator signal. When the paging indicator signal is 8 bits, the expander 20 outputs the first bit at the rising edge of the load signal and transmits one bit in each of the eight cycles of the clock signal.

In step S403, the target device 30 determines the paging address indicated by the paging instruction signal, and in step S405, searches for the paging material indicated by the paging address according to the paging instruction signal. Next, in step S407, the target device 30 outputs the page address and the paging data to the expander 20 via the time slot allocated by the data read line SDataIn. In step S409, the expander 20 reads the paged address of the content transmitted via the material reading line SDataIn, and in step S411, determines whether the paged address of the content of the data reading line SDataIn matches the output to the target device 30. The paging indicates the paging address indicated by the signal. When the page address of the content of the data read line SDataIn matches the page address output to the target device 30, in step S413, the expander 20 receives the page data transmitted by the material read line SDataIn. That is, after the target device 30 transmits the paging address and the paging data to the expander 20, the expander 20 further determines the time slot in the data reading line SDataIn for transmitting the paging address, and the transmitted paging. Whether the address is the required paging address, if the paging address matches, the expander 20 receives the paging data transmitted by the data reading line SDataIn.

Further, when the paging address of the content of the data reading line SDataIn does not conform to the paging address output to the target device 30, the expander 20 ignores the content transmitted by the material reading line SDataIn in step S415.

In summary, the embodiments of the present invention provide a data transmission method for universal serial input and output, which is suitable for use in an extension machine and a target device connected by a universal serial input/output bus. In the embodiment of the present invention, the pager indication signal is actively outputted to the target device by the expander, so that the target device searches for the paged data under the paged address according to the paged address indicated by the page indication signal, and transmits the paged data to The expander is configured to increase the amount of data that the target device can transmit to the expander via the universal serial input/output bus. In one embodiment, the expander can output the paging data under the paging address to the expander once or batch, and when the expander or the target device does not support the transmission interface such as I ² C or UART The data communication between the expander and the target device can be realized not only through the universal serial input/output bus, but also the universal serial input/output bus can transmit a variety of different data contents.

Although the present invention has been disclosed above in the foregoing embodiments, it is not intended to limit the invention. It is within the scope of the invention to be modified and modified without departing from the spirit and scope of the invention. Please refer to the attached patent application for the scope of protection defined by the present invention.

10‧‧‧Common Serial I/O Bus
20‧‧‧Expander
30‧‧‧ Target device
SClock‧‧‧ clock signal line
SLoad‧‧‧ load signal line
SDataOut‧‧‧ data output line
SDataIn‧‧‧ data reading line

FIG. 1 is a schematic diagram of a universal serial input/output bus bar electrical connection expander and a target device according to an embodiment of the invention. 2 is a schematic diagram of a slot assignment of a universal serial input/output bus bar according to an embodiment of the invention. FIG. 3 is a flow chart showing the steps of a data transmission method for universal serial input and output according to an embodiment of the invention. 4 is a flow chart showing the steps of a data transmission method for universal serial input and output according to another embodiment of the present invention.

Claims (10)

A universal serial input/output data transmission method, which is suitable for an expander and a target device connected by a universal serial input/output busbar, the universal serial input/output busbar having at least one data output line and one data read The data transmission method of the universal serial input/output includes: the expander outputs a page indication signal to the target device via the data output line, the page indication signal indicates a page address; the target device according to the page indication Signaling, searching for at least one page data indicated by the page address; the target device outputs the page address and the at least one page data to the expander via the data read line; the expander reads the data read through the data The content transmitted by the line; and when the expander determines that the content transmitted by the data read line includes the paged address, the expander receives the at least one paged material. The data transmission method of the universal serial input/output according to claim 1, further comprising allocating a plurality of time slots of the data output line, and transmitting the page indication signal by a part of the time slots of the time slots. The data transmission method of the universal serial input/output according to claim 1, further comprising: allocating a plurality of time slots of the data reading line, and transmitting the paging by a part of the time slots in the time slots of the data reading line The address, another portion of the time slots, transmits the at least one page of data. The data transmission method of the universal serial input/output according to claim 3, wherein the target device batch outputs the lesser one page data under the paging address to the expander. The data transmission method of the universal serial input/output according to claim 4, wherein the step of outputting the page address and the at least one page data to the expander by the target device via the data read line further includes The target device outputs all the paging data under the paging address to the expander. The data transmission method of the universal serial input/output according to claim 1, wherein the universal serial input/output bus has a clock signal line and a load signal line, and the clock signal line transmits a clock signal, the load The signal line transmits a load signal, and the step of outputting the page indication signal to the target device via the data output line further includes outputting the page indication signal according to the clock signal and the load signal. The data transmission method of the universal serial input/output according to claim 1, wherein the step of reading the content transmitted via the data reading line in the expander further comprises reading the content transmitted by the data reading line The paging address. The data transmission method of the universal serial input/output according to claim 7, further comprising determining, by the expander, whether the read page address meets the page address indicated by the page indication signal output to the target device . The data transmission method of the universal serial input/output according to claim 8, wherein the expander ignores when the expander determines that the read page address does not meet the page address indicated by the page indication signal The data is read from the line. The data transmission method of the universal serial input/output according to claim 1, further comprising the target device determining the paging address indicated by the paging indication signal.