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Method and device for compensating delay caused by extension cable of secure digital card

A technology of secure digital card and extension cable, applied in the field of delay caused by extension cable, can solve problems such as affecting the performance of storage system and reducing the transmission speed of SD card, and achieve the effect of ensuring transmission speed and improving performance

Active Publication Date: 2019-03-01
AUTOCHIPS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This will cause the transmission speed of the SD card to be greatly reduced, which will affect the storage and system performance.

Method used

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  • Method and device for compensating delay caused by extension cable of secure digital card
  • Method and device for compensating delay caused by extension cable of secure digital card
  • Method and device for compensating delay caused by extension cable of secure digital card

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Embodiment Construction

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts belong to the protection scope of the present invention.

[0027] figure 1 It is a schematic diagram of the phase difference between the source clock and the sampling clock of the secure digital card according to the embodiment of the present invention. Such as figure 1 As shown, the phase difference between the falling edge of the source clock and the falling edge of the sampling clock adjacent to the falling edge of the source clock is defined as the phase difference between the source clock and the sampling cl...

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PUM

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Abstract

The invention discloses a method and a device for compensating the delay caused by the extension line of a safe digital card. The method includes: performing a predetermined number of communication operations on the safety digital card via an extension line, if a correct response returned by the safety data card is received, recording the corresponding state value of the communication operation as the first value, and if no return from the safety data card is received If the correct response is correct, record the state value corresponding to the communication operation as the second value; find the longest data segment whose state value is the first value continuously; set the delay of the communication operation corresponding to the state value located in the middle of the longest data segment The value is taken as the optimum delay value; set the optimum delay value as the phase difference between the source clock of the secure digital card and the sampling clock to compensate for the delay caused by the extension cable of the secure digital card. Through the above method, the present invention can make up for the signal transmission delay of the safety digital card and ensure the transmission rate.

Description

technical field [0001] The invention relates to the communication field, in particular to a method and a device for compensating the delay caused by the extension line of a safe digital card. Background technique [0002] In the car-machine system, the card slot for the Secure Digital (SD) card is not placed on the main printed circuit board (PCB), but placed on the operation panel through an extension cable. [0003] The transmission speed of current in different conductors will be different. Generally, the transmission speed is 2x10 8 m / s and 3x10 8 Between m / s, the delay caused by such a 1m-length wire is 4-5ns, and the signal round-trip time is x2, which will increase the delay time by 8-10ns compared with normal conditions. Increasing these times may cause deviations in SD card sampling. Since the extension cable will increase the signal transmission delay and the probability of signal interference, SD cards often have compatibility problems. Some SD cards work fine...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K19/077
CPCG06K19/07749G06F3/0611G06F3/0613G06F3/0653G06F3/0659G06F3/0679G06F11/004G06F11/3034G06F11/3051
Inventor 陈松林
Owner AUTOCHIPS
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