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Data transfer control device and electronic apparatus

A data transmission control and data transmission technology, which is applied in the field of data transmission control devices and electronic equipment, can solve the problems of firmware processing stall, suspension, and firmware can only stand by, so as to prevent system stall, improve reliability, and reduce processing burden. Effect

Inactive Publication Date: 2004-04-14
SEIKO EPSON CORP
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, for example, when the issuance of the transmission start command and the bus reset occur approximately at the same time, the firmware cannot know whether the transmission was suspended due to the occurrence of the bus reset.
Therefore, the firmware can only stand by until the end of the transmission is sent, and there is a risk that the processing of the firmware will stall.

Method used

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  • Data transfer control device and electronic apparatus
  • Data transfer control device and electronic apparatus
  • Data transfer control device and electronic apparatus

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Embodiment Construction

[0057] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

[0058] 1. IEEE1394

[0059] First, IEEE1394 will be briefly described.

[0060] 1.1 Summary

[0061] In IEEE1394 (IEEE1394-1995, P1394.a), high-speed data transmission of 100 to 400 Mbps is possible (800 to 3200 Mbps in P1394.b). In addition, nodes with different transmission speeds are allowed to be connected to the bus.

[0062] Each node is connected in a tree form, and a maximum of 63 nodes can be connected to one bus. If the bus bridge is used, 64000 nodes can be connected.

[0063] In IEEE1394, asynchronous transmission and isochronous transmission are prepared as packet transmission methods. Here, asynchronous transmission is the best transmission method for data transmission requiring reliability, and isochronous transmission is the best method for data transmission such as moving images and audio requiring real-time performance.

[006...

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Abstract

The objective of the present invention is to provide a data transfer control device that enables a reduction in the processing load on the firmware during the occurrence of a bus reset, and electronic equipment using the same. A data transfer control device in accordance with the IEEE 1394 standard generates a bit BT that toggles whenever one received packet and the next received packet are received in different bus reset intervals, and comprises that BT in the header of each packet stored in RAM. Bus reset pointers (a bus reset header pointer and a bus reset ORB pointer) that indicate a bus reset boundary in RAM are provided, enabling simple differentiation between a packet received before a bus reset occurred and a packet received after the reset. If transmission has been halted by the occurrence of the bus reset, the bus reset transmission halt status is passed to the firmware via a register.

Description

technical field [0001] The present invention relates to a data transmission control device and electronic equipment including the device, in particular to a data transmission control device for performing data transmission based on standards such as IEEE1394 among multiple nodes connected to a bus and electronic equipment including the device. Background technique [0002] In recent years, an interface standard called IEEE1394 has attracted attention. This IEEE1394 standardizes a high-speed serial bus interface compatible with next-generation multimedia. According to this IEEE1394, data requiring real-time properties such as moving images can also be used. In addition, in the bus of IEEE1394, not only the peripheral equipment of the computer such as printer, scanner, CD-RW drive, hard disk drive can be connected, but also household appliances such as video camera, VTR, TV can be connected. Therefore, it can be expected that digitization of electronic equipment will be rapi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F13/38G06F13/00H04L12/28H04L12/40H04L12/407H04L12/64H04L13/08
CPCH04L12/40071H04L12/407H04L12/40052H04L12/2801H04L12/02
Inventor 石田卓也神原义幸
Owner SEIKO EPSON CORP
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