CN1804780A - Adaptive memory card compatible to SD and MMC standard - Google Patents
Adaptive memory card compatible to SD and MMC standard Download PDFInfo
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- CN1804780A CN1804780A CN 200610049358 CN200610049358A CN1804780A CN 1804780 A CN1804780 A CN 1804780A CN 200610049358 CN200610049358 CN 200610049358 CN 200610049358 A CN200610049358 A CN 200610049358A CN 1804780 A CN1804780 A CN 1804780A
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Abstract
The invention discloses a self-adjusting card which is compatible with SD and MMC, which comprises a SD/MMC interface, a SD/MMC controller and a storage module, wherein one end of the SD/MMC interface is connected with the out host machine and the other end is connected with the SD/MMC controller; the controller is connected with the storage module by bus; the SD/MMC controller is compatible with SD norm and MMC norm, which can adjust the corresponding norm by the needed of the host machine.
Description
Technical field
The present invention relates to a kind of storage card, refer in particular to a kind of compatible to SD 2.0/SD1.1/SD1.0 standard and MMC3.0/MMC4.0 standard, can adjust the storage card that self meets corresponding standard automatically according to main frame.
Background technology
SD standard (Secure Digital Specification) and MMC standard (Multi Media CardSpecification) are two kinds of standards that are most widely used in the present digital multimedia memory storage.The SD card and the mmc card that meet these two kinds of standards are widely used in the consumption electronic products such as digital camera, mobile phone, PDA, MP3/MP4 player.
Stipulated all in SD standard and the MMC standard that the communication between main frame and the card finishes by order (Command, be called for short CMD) and response (Response is called for short R), main frame passes through the CMD access card, and cartoon is crossed corresponding responsive feedback main frame.
SD standard and MMC standard are not quite similar to the definition of each CMD, so the SD main frame can only be visited the SD card, the MMC main frame can only be visited mmc card, can not exchange visits between the two.Relation between them as shown in Figure 1, the communication between the main frame of SD card and MMC standard is invalid, and is same, the communication between the main frame of mmc card and SD standard also is false.
Have compatible connector part owing to meet the SD card of SD standard with the mmc card that meets the MMC standard, can be inserted in the same socket, this makes becomes possibility with a card while compatible to SD and two kinds of standards of MMC.
Summary of the invention
The invention provides a kind of compatible to SD standard and MMC standard, and can adjust the storage card that self meets corresponding standard automatically according to the main frame standard, adaptive SD of the present invention/MMC storage card can be used to substitute common SD card and mmc card.
The adaptive memory card of a kind of compatible to SD and MMC standard, comprise SD/MMC interface, SD/MMC controller and memory module, SD/MMC interface one end is used for being connected with extraneous main frame, the other end connects the SD/MMC controller, memory module is connected by bus with controller, described SD/MMC controller compatible to SD standard and MMC standard can be read and write standard according to main frame and adjust self automatically to meet corresponding standard, and its self-regulating process may further comprise the steps:
(1) power on after, wait for that main frame sends effective CMD0;
Whether what (2) judgement received is effective CMD0, if continue then to wait for that main frame sends effective ACMD41 or effective CMD1;
Whether what (3) judgement received is effective ACMD41, if, return Response R3, enable the parameter setting and the bottom software of adaptive SD standard, make card become the SD card;
(4) not effective ACMD41 as if what receive, then judge whether to be effective CMD1, if, then return Response R3, enable the parameter setting and the bottom software of adaptive MMC standard, make card become mmc card.
SD/MMC interface connector or golden finger are adopted in described SD/MMC interface.
Described memory module adopts at least one memory device.
Described memory device can adopt erasable, non-volatile semiconductor storage unit.
Compare with mmc card with common SD card, the adaptive memory card of compatible to SD of the present invention and MMC standard can also can be discerned by the MMC main frame automatically by the SD main frame, and it has following characteristic:
1. at the host platform of SD standard, it is the SD standard that adaptive memory card of the present invention automatically identifies the main frame standard, enable the parameter setting and the bottom software of adaptive SD standard simultaneously, this moment, storage card showed as SD card characteristic, can be identified as the SD card by the main frame of SD standard, and correct read-write of mode and visit to meet the SD standard.
2. at the host platform of MMC standard, it is the MMC standard that adaptive memory card of the present invention automatically identifies the main frame standard, enable the parameter setting and the bottom software of adaptive MMC standard simultaneously, this moment, storage card showed as the mmc card characteristic, can be identified as mmc card by the main frame of MMC standard, and correct read-write of mode and visit to meet the MMC standard.
3. the resemblance and the interface signal definition that have compatible to SD 2.0/SD1.1/SD1.0 standard and MMC3.0/MMC4.0 standard.
Description of drawings
Fig. 1 is the availability of main frame-generic card;
Fig. 2 is the availability of the adaptive memory card of main frame-compatible to SD and MMC standard;
Fig. 3 is a structured flowchart of the present invention;
Fig. 4 is an adaptive process process flow diagram of the present invention.
Embodiment
As shown in Figure 2, the adaptive memory card of compatible to SD of the present invention and MMC standard can also correctly be read and write and visit by the identification of SD main frame as the SD card, also can also correctly be read and write and visit by the identification of MMC main frame as mmc card.
As shown in Figure 3, the adaptive memory card of a kind of compatible to SD and MMC standard comprises SD/MMC interface 1, SD/MMC controller 2 and memory module 3, SD/MMC interface 1 one ends are used for being connected with extraneous main frame, the other end connects SD/MMC controller 2, and memory module 3 and controller 2 are connected by bus
The interface connector or the golden finger of SD/MMC compatibility adopted at SD/MMC interface 1.
SD/MMC controller 2 and SD/MMC boundary element 1 are together, finish the transmission of adaptive process, data of SD/MMC storage card and configuration, the report of state, interface function and the compatibility thereof of SD/MMC, also finish simultaneously operation, as the order of reading and writing, wiping and backup etc. to memory module.This SD/MMC controller 2 can (but being not limited to) be the integrated circuit of a single-chip.
SD/MMC controller 2 compatible to SD standards and MMC standard can be read and write standard according to main frame and adjust self automatically to meet corresponding standard, and as shown in Figure 4, its self-regulating process may further comprise the steps:
(1) power on after, wait for that main frame sends effective CMD0;
Whether what (2) judgement received is effective CMD0, if continue then to wait for that main frame sends effective ACMD41 or effective CMD1;
Whether what (3) judgement received is effective ACMD41, if, return Response R3, enable the parameter setting and the bottom software of adaptive SD standard, make card become the SD card;
(4) not effective ACMD41 as if what receive, then judge whether to be effective CMD1, if, then return Response R3, enable the parameter setting and the bottom software of adaptive MMC standard, make card become mmc card.
Claims (4)
1. the adaptive memory card of compatible to SD and MMC standard, comprise SD/MMC interface (1), SD/MMC controller (2) and memory module (3), SD/MMC interface (1) one end is used for being connected with extraneous main frame, the other end connects SD/MMC controller (2), memory module (3) is connected by bus with controller (2), it is characterized in that: described SD/MMC controller (2) compatible to SD standard and MMC standard, can read and write standard according to main frame and adjust self automatically to meet corresponding standard, its self-regulating process may further comprise the steps:
(1) power on after, wait for that main frame sends effective CMD0;
Whether what (2) judgement received is effective CMD0, if continue then to wait for that main frame sends effective ACMD41 or effective CMD1;
Whether what (3) judgement received is effective ACMD41, if, return Response R3, enable the parameter setting and the bottom software of adaptive SD standard, make card become the SD card;
(4) not effective ACMD41 as if what receive, then judge whether to be effective CMD1, if, then return Response R3, enable the parameter setting and the bottom software of adaptive MMC standard, make card become mmc card.
2. the adaptive memory card of compatible to SD as claimed in claim 1 and MMC standard is characterized in that: SD/MMC interface connector or golden finger are adopted in described SD/MMC interface (1).
3. the adaptive memory card of compatible to SD as claimed in claim 1 and MMC standard is characterized in that: described memory module (3) adopts at least one memory device.
4. the adaptive memory card of compatible to SD as claimed in claim 3 and MMC standard is characterized in that: described memory device can adopt erasable, non-volatile semiconductor storage unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610049358 CN1804780A (en) | 2006-01-25 | 2006-01-25 | Adaptive memory card compatible to SD and MMC standard |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610049358 CN1804780A (en) | 2006-01-25 | 2006-01-25 | Adaptive memory card compatible to SD and MMC standard |
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| CN1804780A true CN1804780A (en) | 2006-07-19 |
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| CN 200610049358 Pending CN1804780A (en) | 2006-01-25 | 2006-01-25 | Adaptive memory card compatible to SD and MMC standard |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102103887A (en) * | 2009-12-21 | 2011-06-22 | 上海华虹集成电路有限责任公司 | Method for releasing card power up status bit of SD (secure digital) memory card and hardware circuit |
| CN102253809A (en) * | 2010-05-17 | 2011-11-23 | 中兴通讯股份有限公司 | Composite memory card and control method thereof |
| CN111414125A (en) * | 2018-12-18 | 2020-07-14 | 华为技术有限公司 | Operation method of storage device and storage device |
| CN111428840A (en) * | 2018-12-24 | 2020-07-17 | 华为技术有限公司 | Function card identification method and mobile device |
-
2006
- 2006-01-25 CN CN 200610049358 patent/CN1804780A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102103887A (en) * | 2009-12-21 | 2011-06-22 | 上海华虹集成电路有限责任公司 | Method for releasing card power up status bit of SD (secure digital) memory card and hardware circuit |
| CN102103887B (en) * | 2009-12-21 | 2014-01-01 | 上海华虹集成电路有限责任公司 | Method for releasing card power up status bit of SD (secure digital) memory card and hardware circuit |
| CN102253809A (en) * | 2010-05-17 | 2011-11-23 | 中兴通讯股份有限公司 | Composite memory card and control method thereof |
| CN111414125A (en) * | 2018-12-18 | 2020-07-14 | 华为技术有限公司 | Operation method of storage device and storage device |
| CN111428840A (en) * | 2018-12-24 | 2020-07-17 | 华为技术有限公司 | Function card identification method and mobile device |
| CN111428840B (en) * | 2018-12-24 | 2023-03-28 | 华为技术有限公司 | Function card identification method and mobile device |
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