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Frame structure suitable for serial peripheral equipment interface bus high-level protocol

A device interface and serial peripheral technology, applied in the field of master-slave communication, can solve problems such as high overhead, low efficiency, and not supporting full-duplex transmission

Inactive Publication Date: 2006-03-08
VIMICRO CORP
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  • Abstract
  • Description
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Problems solved by technology

[0005] The shortcoming of this high-level protocol is not to support full-duplex transmission; does not support SP1 interrupt transmission, promptly requires SSN must keep low level in the whole frame transmission process; Fixed, so overhead and inefficiency when transferring small amounts of data

Method used

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  • Frame structure suitable for serial peripheral equipment interface bus high-level protocol
  • Frame structure suitable for serial peripheral equipment interface bus high-level protocol

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Embodiment Construction

[0026] In the following description, well-known functions or structures will not be described in detail to avoid unnecessary confusion with the content of the present invention.

[0027] A frame structure suitable for a high-level protocol of serial peripheral device interface bus data transmission, characterized in that: a variable-length data frame includes a frame header and a payload, and the change of the length is defined by the frame header.

[0028] as shown in picture 2. The data frame is composed of frame header and payload. The payload is the data to be transmitted, and its length can be changed. Because it carries variable data volume services, in order to improve transmission efficiency, a variable-length frame structure is adopted. In this high-level protocol, both the frame header and the payload are of variable length, and are defined by the frame header.

[0029] The header structure of the frame is shown in Figure 3, which consists of one or more subframe h...

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Abstract

The disclosed structure of frame as length variable data frame includes frame head and payload. Frame head defines variety of length. Using the said structure of frame makes protocol in high layer possible to support data transmission with addressing requirement between master device and slave devices. Using scheme of sub frame heads in the structure of frame makes protocol in high layer possible to support communication in full duplex or half-duplex modes between master device and slave devices in high efficiency. In time of transferring low volume data, the method uses short head in structure of frame with variable length in order to raise transmission efficiency.

Description

technical field [0001] The invention relates to master-slave communication between electronic devices, in particular to a frame structure suitable for a high-level protocol of a serial peripheral device interface bus. Background technique [0002] Serial communication is a very important data communication method between the master device and the external device. Fewer data lines are required compared to a parallel communication bus. Serial Peripheral Interface (Serial Peripheral Interface, SPl) is a synchronous serial bus proposed by Motorola, which is used for data exchange between the master device and the peripheral device. The SPI bus is a master-slave communication mechanism, the master device is the master device, and the peripheral device is the slave device. It consists of 4 buses, namely the serial clock line (SCK), the master input / slave output data line (MlSO), the master output / slave input data line (MOSI) and the slave device active selection line (SSN ). C...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F13/42
Inventor 王军金传恩谢律
Owner VIMICRO CORP
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