Seven-port gigabit Ethernet switching circuit based on domestic switching chip

Abstract

The invention discloses a seven-port gigabit Ethernet switching circuit based on a domestic switching chip, which comprises an Ethernet switching chip, power supply chips, a DC-DC power supply module, a transformer and an interface module, and is characterized in that the output end of the DC-DC power supply module respectively outputs 3.3 V voltage and 1.1 V voltage to supply power to the Ethernet switching chip through the two power supply chips; according to the power supply device, the input power supply range is DC9V-DC36V, the input voltage is wide, and the power supply device can be conveniently arranged in system equipment to carry out in-board interconnection and port expansion; the temperature grades of adopted components are all industrial-grade devices, and the working temperature range is wide; all-localization design is adopted for components, and the method is particularly suitable for scenes and equipment with high component localization requirements. And a gigabit Ethernet interface is provided, so that the interface requirements of most use scenes are met.

Description

Technical Field

[0001] The invention relates to the technical field of chips, and in particular to a seven-port Gigabit Ethernet switching circuit based on a domestic switching chip. Background Art

[0002] Existing energy storage PCS or systems have deficiencies in Ethernet communication, network switching, multi-level parallel communication, etc., which need to be improved and upgraded. Summary of the invention

[0003] In order to make up for the deficiencies of the prior art, the embodiment of the present application proposes a seven-port Gigabit Ethernet switching circuit based on a domestic switching chip to solve the problems existing in the prior art.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0005] A seven-port Gigabit Ethernet switching circuit based on a domestic switching chip comprises an Ethernet switching chip, a power chip, a DC-DC power module, a transformer and an interface module. The output end of the DC-DC power module outputs a 3.3V voltage and a 1.1V voltage respectively through two power chips to power the Ethernet switching chip. The Ethernet switching chip is connected to an RS232 interface through an RS232 transceiver. The Ethernet switching chip integrates 5 Ethernet PHYs inside, and directly connects the 5 Gigabit Ethernet differential signals to a peripheral network transformer and an RJ45 interface. Meanwhile, 2 GMAC expansion ports are integrated, and the RGMII / RMII / MII protocol is supported. The design adopts RGMII, and 2 Ethernet interface signals are expanded through an external Ethernet PHY chip, and then connected to a network transformer and an RJ45 interface to obtain two Gigabit Ethernet interfaces.

[0006] As a further technical solution of the present invention: the Ethernet switching chip adopts the SF2507EBI switching chip.

[0007] As a further technical solution of the present invention: the DC-DC power supply module has an input range of DC9V-DC36V, an output of DC12V, and an output power of 10W.

[0008] As a further technical solution of the present invention: the Ethernet switching chip is also connected to a reset circuit, and the reset circuit adopts a reset chip SGM809B-SXN3LG / TR.

[0009] As a further technical solution of the present invention: the Ethernet switching chip is also connected to a crystal oscillator, which is a 25MHz passive crystal oscillator, which provides a clock to the PLL inside the switching chip for clock multiplication and provides a clock for the Ethernet interface.

[0010] As a further technical solution of the present invention: the Ethernet switching chip is also connected to an EEPROM memory, which communicates with the switching chip via an I 2C interface and is used for storing the burned firmware.

[0011] As a further technical solution of the present invention: the UART interface of the Ethernet switch chip is designed with an RS232 transceiver to expand an RS232 interface, through which the firmware of the EEPROM plug-in of the switch chip can be upgraded. The RS232 transceiver is designed with SI T3232SUEE of Xinlite.

[0012] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0013] 1. The input power range is DC9V-DC36V, with a wide input voltage, which is convenient for integration into system equipment for on-board interconnection and port expansion; the temperature grade of the components used are all industrial-grade devices with a wide operating temperature range;

[0014] 2. The components are designed to be domestically produced, which is especially suitable for scenarios and equipment that require high localization of components. It has a Gigabit Ethernet interface to meet the interface requirements of most usage scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural diagram of the overall principle of the present invention;

[0016] Figure 2 This is a power supply circuit diagram of the present invention;

[0017] Figure 3 The circuit diagram of the switching chip of the present invention;

[0018] Figure 4 This is the RJ5 Ethernet interface circuit diagram of the present invention;

[0019] Figure 5 The Ethernet PHY circuit diagram is extended for the present invention;

[0020] Figure 6 This is a reset circuit diagram of the present invention;

[0021] Figure 7 This is the crystal oscillator circuit diagram of the present invention;

[0022] Figure 8 It is the serial port circuit diagram of the present invention. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] like Figure 1 As shown, the present invention uses the SF2507EBI switch chip of Nanfei Microelectronics to realize seven-port Gigabit Ethernet switching. The power input range of the design is DC9V-DC36V, 7-way RJ45 standard network ports are designed, the communication rate supports 10M / 100M / 1000M, and 7-port network data exchange can be realized.

[0025] The power supply designed by this invention adopts two-stage power conversion. The first stage adopts an isolated DC-DC power module with an input range of DC9V-DC36V, an output of DC12V, and an output power of 10W, ensuring the isolation of the external input power supply and the subsequent functional circuit. The second stage power conversion adopts a DC-DC power chip to convert DC12V into DC3.3V and DC1.1V for use by the switching chip and other functional circuits. At the same time, the external power input end is designed with a power reverse connection and surge protection circuit to prevent positive and negative reverse connection and surge peak voltage from damaging the circuit. The power supply design schematic diagram is as follows Figure 2 shown.

[0026] The switching circuit is designed based on Nanfei Microelectronics' SF2507EBI switching chip. The SF2507EBI integrates a CPU and a 5-port 10M / 100M / 1000M PHY, and each port supports full-duplex (10 / 100 / 1000M); it also integrates 2 GMAC expansion ports, supports RGMII / RMII / MII protocols, and can expand 2 Ethernet interfaces. The use of SF2507EB I can achieve 5+2-port 10 / 100 / 1000M high-performance Ethernet switching. In addition, the SF2507EBI also integrates high-speed switching system functions: switching processing protocol, packet cache SRAM, non-blocking switching structure and internal register management. The clock source of the SF2507EB I only requires a 25MHz crystal or crystal oscillator, and the internal register initialization configuration can be completed through an external Flash or EEPROM. The switching chip circuit design is as follows Figure 3 shown.

[0027] SF2507EBI integrates 5 Ethernet PHYs. By directly connecting 5 Gigabit Ethernet differential signals to the peripheral network transformer and RJ45 interface, you can design a Gigabit Ethernet interface. Figure 4 shown.

[0028] SF2507EBI integrates 2 GMAC expansion ports, supports RGMII / RMII / MII protocols, and uses RGMII in the design. It uses an external Ethernet PHY chip to expand 2 Ethernet interface signals, and then connects the network transformer and RJ45 interface to obtain two Gigabit Ethernet interfaces. The Ethernet PHY chip is designed using Yutai Microelectronics YT8521S. The design circuit is as follows Figure 5 shown.

[0029] The reset circuit uses the power monitoring and reset chip SGM809B-SXN3LG / TR for reset circuit design. This chip can monitor the 3.3V voltage that powers the switch chip. When the voltage is lower than 2.93V, it will output a low-level reset signal to reset the switch chip. Figure 6 shown.

[0030] The EEPROM uses a 256kb EEPROM memory, which communicates with the switch chip through the I2C interface and is used to store the burned firmware. Figure 7 shown.

[0031] The UART interface design of the switch chip uses an RS232 transceiver to expand an RS232 interface. The firmware of the EEPROM plug-in of the switch chip can be upgraded through the RS232 interface. The RS232 transceiver is designed using SI T3232SUEE from Xinlite. The design schematic diagram is as follows Figure 8 shown.

[0032] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

[0033] In addition, it should be understood that although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment have also been appropriately combined to form other implementation methods that are easy for those skilled in the art to understand.

Claims

1. A seven-port Gigabit Ethernet switching circuit based on a domestic switching chip, comprising an Ethernet switching chip, a power chip, a DC-DC power module, a transformer and an interface module, characterized in that: The output end of the DC-DC power module outputs 3.3V voltage and 1.1V voltage respectively through two power chips to power the Ethernet switching chip. The Ethernet switching chip is connected to the RS232 interface through an RS232 transceiver. The Ethernet switching chip integrates 5 Ethernet PHYs inside, and directly connects the 5 Gigabit Ethernet differential signals to the peripheral network transformer and the RJ45 interface. At the same time, 2 GMAC expansion ports are integrated to support the RGMII / RMII / MII protocol. The design adopts RGMII, expands 2 Ethernet interface signals through an external Ethernet PHY chip, and then connects the network transformer and the RJ45 interface to obtain two Gigabit Ethernet interfaces.

2. A seven-port Gigabit Ethernet switching circuit based on a domestic switching chip according to claim 1, characterized in that: The Ethernet switching chip adopts the SF2507EBI switching chip.

3. The seven-port Gigabit Ethernet switching circuit based on a domestic switching chip according to claim 1, characterized in that: The DC-DC power supply module has an input range of DC9V-DC36V, an output of DC12V, and an output power of 10W.

4. The seven-port Gigabit Ethernet switching circuit based on a domestic switching chip according to claim 1, characterized in that: The Ethernet switching chip is also connected to a reset circuit, and the reset circuit uses a reset chip SGM809B-SXN3LG / TR.

5. The seven-port Gigabit Ethernet switching circuit based on a domestic switching chip according to claim 1, characterized in that: The Ethernet switching chip is also connected to a crystal oscillator, which is a 25MHz passive crystal oscillator, and provides a clock to the PLL inside the switching chip for clock multiplication, and provides a clock for the Ethernet interface.

6. The seven-port Gigabit Ethernet switching circuit based on a domestic switching chip according to claim 1, characterized in that: The Ethernet switch chip is also connected to an EEPROM memory, which communicates with the switch chip via an I 2C interface and is used to store the burned firmware.

7. The seven-port Gigabit Ethernet switching circuit based on a domestic switching chip according to claim 2, characterized in that: The UART interface of the Ethernet switch chip is designed with an RS232 transceiver to expand an RS232 interface, through which the firmware of the EEPROM plug-in of the switch chip can be upgraded. The RS232 transceiver is designed with SIT3232SUEE of Xinlite.

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