CN2417505Y - Memory card shared device for computer - Google Patents

Abstract

The utility model relates to a shared device for an intelligent PC card and a PC special card which are used for a desk computer, which comprises a switching circuit, an automatic identification circuit, a PC special card logical circuit and an isolating circuit. The utility model can realize that the data of the portable computer intelligent PC card can carry out the exchange on the desk computer, the shared device is used by the non-intelligent PC private memory card with large capacity, and the data access can also be carry out with the desktop computer. The utility model has the advantages of simple structure and low cost.

Description

A kind of computing machine sharing means of memory card

The utility model relates to a kind of computer equipment, particularly relates to a kind of sharing means that PC card and PC personality card are used for desk-top computer.

Present intelligent PC card (to call the PC card in the following text) is widely used for portable machine as external storage.It is the intelligence memory card of a kind of CPU of including, and during use the PC card being inserted portable machine PCMCIA STD bus can be as the disk access data.But intelligent PC card can not use on desktop computer, and promptly the PC data that are stuck in access on the portable machine can not directly be exchanged on desktop computer, and applicability is restricted.

" the flash memory users' guidebook " of Electronic Industry Press's translation issuing introduced the circuit on probation that a kind of PC card can use on desktop computer, though can be used for main working method, but still do not have the shared ability of PC card and PC personality card.

It is a kind of simple in structure, easy to use that the purpose of this utility model is to provide, the sharing means that PC card and PC personality card can directly be used on desktop computer.

Formation of the present utility model comprises change-over circuit, automatic identification circuit, PC personality card logic and buffer circuit.Wherein said automatic identification circuit input end links to each other with PCMCIA (portable machine STD bus) socket, and it has two output terminals, and one terminates at change-over circuit, and the other end is connected on PC personality card logic.The output of change-over circuit is connected on ide interface.The output of PC personality card logic is connected on buffer circuit, and buffer circuit output is connected on the change-over circuit input end.

The course of work of the present utility model is such: when the PC card inserts the PCMCIA socket, what automatic identification circuit can be discerned current insertion is the PC card, and the PC card information become the ide interface signal by change-over circuit with the pcmcia interface information translation, so just realized the exchange message of data on desktop computer of PC card.When PC personality card insertion PCMCIA socket, what automatic identification circuit can be discerned current insertion is the PC personality card, and PC personality card information is arrived change-over circuit by PC personality card logic by buffer circuit, then with the desktop computer exchange message.So just realized to use the PC card on the device, also can use personality card.Buffer circuit is in order to prevent that PC card information and PC personality card information from interacting.

The whole parts of the utility model are installed on the plug-in card, and the ide interface on the plug-in card is linked to each other with Computer I DE interface, then can operate easily.

This device has automatic recognition capability.When the PC card inserts in the PCMCIA socket of this device, may realize that then the data of portable machine PC card and desktop computer carry out exchanges data, when the PC personality card inserts in the PCMCIA socket of this device, can make the data of PC personality card and desktop computer carry out data access.

The device that the utility model provides, the data that can make PC be stuck in access on the portable machine can be exchanged at the enterprising line data of desktop computer, the PC personality card can be directly on this device and desktop computer carry out data access.Also have following advantage:

1. same socket can insert the PC card, also can insert the PC personality card.

Low, the applied range of cost, applicability strong, be easy to promote.

Concrete structure of the present utility model is provided by following embodiment and accompanying drawing thereof.

Figure l is a pie graph of the present utility model.

Fig. 2, Fig. 3 are the circuit structure diagrams of a kind of most preferred embodiment of the utility model.

Fig. 4 is an installation diagram of the present utility model.

Describe the structure and the course of work of present embodiment in detail below in conjunction with Fig. 2, Fig. 3.Wherein Fig. 2 dotted line block diagram I is a PC card driving circuit, Fig. 3 frame of broken lines II is a PC personality card control circuit, Fig. 2 dotted line block diagram VII and Fig. 3 frame of broken lines III are PC personality card logics, Fig. 3 frame of broken lines IV is a PC personality card data line buffer circuit, Fig. 3 frame of broken lines V is control of PC personality card and condition line buffer circuit, Fig. 2 dotted line block diagram VI automatic selection circuit.

Fig. 2 dotted line block diagram I is the PC card control circuit, and it is made up of according to transceiver 74F245 two numbers of elements, whether controls it by gating by RG.When RG=0, two (U1, U2) 74F245 work, during RG=1, two (U1, U2) 74F245 do not work.Fig. 2 dotted line block diagram VII and Fig. 3 frame of broken lines II, III, IV are PC personality card control circuit, wherein Fig. 3 dotted line block diagram II is a PC personality card driving circuit, it also is made up of according to transceiver 74F245 two numbers of elements, whether control them by gating by SG, when SG=0, two (U3, U4) 74F245 work, during SG=1, two (U3, U4) 74F245 do not work.Fig. 2 dotted line block diagram VII and Fig. 3 frame of broken lines III are PC personality card logics.It comprises the DSP digital processing unit, the MX28F2100 of storage and managenent program, reset circuit R3, C3, R7 and clock circuit etc.Fig. 2 dotted line block diagram VII and Fig. 3 frame of broken lines III are work like this, behind the electrification reset, and DSP work, the operation of U9/MX2F2100 supervisory routine, and the interrupt request of wait pcmcia interface produce when sector read/write and interrupt.Fig. 3 dotted line block diagram IV is the data line buffer circuit, and it is made up of according to transceiver 74F245 two numbers of elements, when controlling it whether by gating by T/P.When T/P=0, two (U12, U13) 74F245 work, during T/P=1, two (U12, U13) 74F245 do not work.Fig. 3 dotted line block diagram V is control and status signal buffer circuit, and it is made up of DIP switch.When DIP pushes the ON position, from BWAIT, the BSPKR of DSP, BSTSC, BHOST, BIOIS through to ide interface.When DIP pushed the OFF position, the BWAIT of DSP, BSPKR, BSTSC, BHOST, BIOIS and ide interface disconnected.Fig. 2 dashed line view VI is an automatic selection circuit.This circuit is formed interlock circuit by circuit such as 74F08,74F32,74F30, and produces RG, SG, T/P signal, and RG, SG, T/P produce like this, CE1～2 are low level effectively, and SEL is invalid to be high level, and FCE0～7 are invalid to be high level, RG=0 then, SG=1, T/P=1.When CE1～2 are effective low level, the effective low level of SEL, arbitrary signal effectively is a low level in FCE0～7, RG=1 then, SG=0, T/P=O, address signal, SEL were from PC card and PC personality card control signal when wherein CE1～2 were for sector read/write, and the PC card inserts PCMCIA socket, SEL=1, when the PC personality card inserts the PCMCIA socket, SEL=0.FCE0～7th, the personality card chip selection signal.

Introduce Fig. 3 and Fig. 2 dotted line block diagram I and II, III, IV control flow below respectively: after the PC card inserts the PCMCIA socket, and when carrying out sector read/write, CE1～2=0 in Fig. 2 dotted line block diagram VI, SEL=1, FCE0～7=1, then RG=0, SG=1, T/P=1, two 74F245 work of U1, U2.The data of PC card just can be passed through Fig. 2 dotted line block diagram I and desktop computer exchange message like this.

When PC is special-purpose insert the PCMCIA socket after, and when carrying out sector read/write, CE1～2=0 in Fig. 2 dashed line view VI, SEL=0, FCE0～7 are arbitrary to be low, RG=1 then, SG=0, T/P=0.Dotted line block diagram II, III, IV circuit working.Therefore just block diagram II, III, IV and desktop computer exchange message circuit working by a dotted line of the data of PC personality card.

The circuit of forming by Fig. 2 and Fig. 3, be welded on the plate spare plate, ide interface on the plug-in card is linked to each other with Computer I DE interface, just the access data that can make intelligent PC be stuck in portable machine uses on desktop computer, and non intelligent PC personality card can directly carry out data access with desktop computer on this device.

Claims (4)

1. a computing machine memory card sharing means is characterized in that comprising change-over circuit, automatic identification circuit, PC personality card logic and buffer circuit; Wherein said automatic identification circuit input end links to each other with portable machine STD bus PCMCIA socket, and it has two output terminals, and one terminates at change-over circuit, and the other end is connected on PC personality card logic; The output of change-over circuit is connected on ide interface, and the output of PC personality card logic is connected on buffer circuit, and buffer circuit output is connected on the change-over circuit input end.

2. the described computing machine of claim 1 memory card sharing means, it is characterized in that also comprising that PCMCIA socket and ide interface have two 74F245, wherein two 74F,245 one ends are connected on the data line of PCMCIA socket, and the other end is connected on the ide interface data line.

3. claim 1 or 2 described computing machine memory card sharing means is characterized in that the data line of PCMCIA socket links to each other with DSP by two 74F245, and the output data line of DSP links to each other with IDE by two 74F245.

4. the described computing machine of claim 1 memory card sharing means is characterized in that whole parts of this device are installed on the plug-in card, and the ide interface of plug-in card is connected on the Computer I DE interface with cable.

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