Group synchronization serial bus method and system
A synchronous serial and bus system technology, applied in the field of microcomputer applications, can solve the problems of communication resources and memory waste, and achieve the effects of improving line utilization, saving FPGA internal resources, and having a simple structure
Active Publication Date: 2013-11-27
BEIJING JN TASS TECH
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[0006] Its disadvantage is that when the fixed point-to-point connection mode works in multiple SPI clusters, multiple peripherals need multiple corresponding interfaces connected to it and corresponding buffers or memory, and usually the idle time of SPI bus communication is longer than the transmission time , resulting in a waste of communication resources and memory
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[0067] The principles and features of the present invention are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.
[0068] Such as Figure 6 Shown, a kind of group synchronous serial bus method described in specific embodiment 1 of the present invention, each SPI bus adopts three-wire SPI mode, specifically comprises the following steps:
[0069] Step 1: In the idle state, the input IN and output OUT signals are both high level, that is, MISO and MOSI are high level, and the clock signal CLK is low level; the initiating device sends the application information. When entering the application state, the data is output The signal line OUT (MOSI for the master device and MISO for the slave device) is pulled to low level. Such as Figure 7 shown.
[0070] Step 2: The dynamic bus allocator 3 receives the application information, det...
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The invention relates to a group synchronization serial bus method and system. The method includes the following steps that 1, equipment of a primary synchronization serial equipment group or equipment of a secondary synchronization serial equipment group sends application information to a dynamic bus allocator; 2, the dynamic bus allocator receives the application information, detects the idle condition of opposite end equipment, and enables an application equipment bus to be connected to a synchronization serial bus of idle equipment; 3, the equipment of the secondary synchronization serial equipment group or the equipment of the primary synchronization serial equipment group responds; 4, data are transmitted to the synchronization serial bus of the opposite end equipment connected with the dynamic bus allocator; 5, the equipment of the primary synchronization serial equipment group and the equipment of the secondary synchronization serial equipment group return to the idle condition. Therefore, data transmission of asymmetrical group synchronization serial buses is achieved, and both an equipment bus of a primary group and an equipment bus of a secondary group can launch applications.
Description
technical field [0001] The invention relates to a group synchronous serial bus method and system, and belongs to the application field of microcomputers. Background technique [0002] At present, there are many connection buses between computers and peripherals. The most common computer parallel buses include data bus, address bus and control bus (read, write, enable, chip select, direction indication, valid address, etc.). The serial bus includes I 2 C, SPI, USB, SATA, etc.; [0003] Among them, the SPI synchronous serial bus is a common connection bus used for CPU and peripheral devices, and its main advantages are: [0004] 1. Three connecting wires or four connecting wires realize data transmission, the circuit is simple and the speed is high; [0005] 2. Point-to-point fixed connection, simple structure and low implementation cost; [0006] Its disadvantage is that when the fixed point-to-point connection mode works in multiple SPI clusters, multiple peripherals nee...
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IPC IPC(8): G06F13/38
Inventor 闫鸣生李国赵治国
Owner BEIJING JN TASS TECH