KR20020048562A - Pcmcia card interface apparatus - Google Patents

Abstract

PURPOSE: An interface device of a PCMCIA card is provided to easily embody the interface device using a cheap TTL(Transistor Transistor Logic) without an expensive PLD(Programmable Logic Device). CONSTITUTION: In a PCMCIA(Personal Computer Memory Card International Association) interface device applied to a system having an interface function of a PCMCIA card, an attribute memory access function and an input/output access function are embodied by a TTL logic. An AND gate(31) logically multiplies signals applied to an nECS0 terminal and an nECS1 terminal and outputs the signals to an AnPCE1 terminal and an nPREG terminal. The first OR gate(32) ORs signals applied to the nECS0 terminal and an nOE terminal and outputs the result to an nPOE terminal. The second OR gate(33) ORs signals inputted to the nECSO terminal and an nWBEO terminal and outputs the result to an nPWE terminal. The third OR gate(34) ORs a signal applied to the nECS1 terminal and a signal inputted to the nOE terminal and outputs the result to an nPIORD terminal. The fourth OR gate(35) ORs a signal inputted to the nECS1 terminal and a signal inputted to the nWBEO terminal and outputs the result to an nPIOWR terminal. The fifth OR gate(36) ORs a signal applied to the nECS1 terminal and a signal applied to an APWP_nIO terminal and outputs the result to an AnPCE2 terminal. An nWAIT terminal is directly connected to an AnPWAIT terminal.

Description

PCCIA IC card interface device {PCMCIA CARD INTERFACE APPARATUS}

The present invention relates to an interface device of a PCMCIA card for performing a function provided by a PCMCIA card. More specifically, the present invention can be implemented at a low price and improves productivity by eliminating the PLD programming process. It relates to a PCMCIA interface device that they can easily apply.

In general, the PCMCIA (Personal Computer Memory Card International Association), which is well known as a modem card or a wireless LAN card, refers to an international technical standard for a memory card of a PC. Currently, the PCMCIA standard supports I-1 for memory card, II for fax modem or LAN card or other I / O, III for hard disk, and IV for high-capacity storage media. There are three types of cards.

Many of the current communication systems are configured to use the PCMCIA card, which includes computers, PDAs, set-top boxes, web boxes, WLAN access points, and residential gateways. gateway).

As the type of the PCMCIA card, there are a flash memory card, a LAN card, a wireless LAN card, a modem card, and the like, which are mostly used in a system having a PCMCIA interface function.

A configuration means is required for the interface between the PCMCIA card and the computer as described above. In the current system, a high cost programmable logic device (PLD) is used for all functions that can be supported by the PCMCIA interface.

Examples of functions provided by conventional PCMCIA interface devices include attribute memory access, common memory access, I / O access, 2-port support, hot plug-in support, It has a PCMCIA watchdog.

In order to provide all of the functions described above in a PCMCIA interface device, a PLD with 256 registers at 12000 gates should be used, which is expensive and is not suitable for home or small-scale and useless systems. There is a problem that it is not suitable to apply.

The present invention has been proposed to solve the above-described problems, and its object is not to implement expensive PLD, but can be implemented inexpensively using low-cost TTL logic so that anyone can easily apply it to their system. It is to provide an interface device.

1 is a timing diagram showing an attribute read cycle in an interface device of a PCMCIA card according to the present invention.

2 is a timing diagram showing an I / O access cycle in the interface device of a PCMCIA card according to the present invention.

3 is a logic circuit diagram showing a partial configuration of an interface device of a PCMCIA card according to the present invention.

* Description of the symbols for the main parts of the drawings *

31: AND gate

32 ~ 36: OR gate

nECS0, nECS1, nOE, nWBE0, nWAIT: CPU signal input terminal

AnPCE1, nPREG, nPOE, nPWE, nPIORD, nPIOWR, AnPCE2, APWP_nIO, AnPWAIT; PCMCIA control signal output terminal

As a construction means for achieving the above object of the present invention, the present invention is a PCMCIA (PCMCIA) interface apparatus applied to a system having an interface function of the PCM IC card,

Attribute memory access capabilities,

The input / output access function is implemented by TTL logic.

It features.

Hereinafter, a PCMCIA interface device according to the present invention will be described in detail with reference to the accompanying drawings.

The present invention does not support all of the PCMCIA interface functions in order to be easy to apply to a system used by a general home or SOHO type, so that the cost is low, and only the functions currently used mainly according to user requirements are provided. In doing so, the implementation of the interface device is composed of TTL logic.

Among the six functions of the conventional PCMCIA interface described above, the two-port support function usually requires the two-port support function for general personal users, and as the system stabilizes, the watchdog function becomes unnecessary. Among the three access methods, many were not actually used, such as not using the common memory access function.

Therefore, in the present invention, only two of the above-mentioned six functions are required. At this time, there are two functions, an attribute memory access function and an I / O access function.

Among the above functions, an attribute read cycle for each control signal is shown in the timing diagram of FIG. 1, and an I / O access cycle is shown in the timing diagram of FIG.

That is, during the attribute read cycle, while the memory address is applied for 300 ms, the read control signals, -REG, -CE1, -CE2, -OE, WE signals of the memory are applied as shown in FIG. Is read.

The I / O access is applied with an address ADDR for a time of 255 ms, and at the same time, the input / output access control signals -REG, -CE1, -CE2, -IORD or -IOWR, -IOIS16, and -WAIT signal. Is applied as shown in Fig. 2, whereby data is input and output controlled within this time.

The present invention provides a PCMCIA interface device having only the attribute memory access function and the I / O access function shown in FIGS. 1 and 2.

FIG. 2 is a logic circuit diagram illustrating a PCMCIA interface device according to the present invention, and includes an AND gate 31 for simultaneously multiplying signals applied to nECS0 and nECS1 to AnPCE1 and nPREG, and to nECS0 and nOE. A first or gate 32 for ORing the signals and outputting the result to the nPOE stage, a second or gate 33 for ORing the signals input to the nECSO and nWBEO stages and outputting the result to the nPWE stage, A third orifice 34 for ORing the signal applied to the nECS1 stage and the signal input to the nOE stage and outputting the result as nPIORD, the signal input to the nECS1 stage and the signal input to the nWBEO stage And a fourth or gate 34 outputting the result to the nPIOWR stage, and a fifth or gate 35 outputting the signal applied to the nECS1 stage and the signal input to the APWP_nIO stage to the AnPCE2 stage. And, nWAIT stage is directly connected to AnPWAIT stage.

At this time, the nECS0, nECS1, nOE, nWBE0, nWAIT stage is connected to the CPU of the computer, the AnPCE1, nPREG, nPOE, nPWE, nPIORD, nPIOWR, AnPCE2, APWP_nIO, AnPWAIT stage is connected to the PCMCIA.

The logic circuit shown in FIG. 3 operates like the timing chart shown in FIGS. 1 and 2.

That is, the logic circuit shown in FIG. 3 generates the timing signals shown in FIGS. 1 and 2 as described above, and performs a function of performing input / output operations of data or accessing a memory through a PCMCIA card.

As described above, according to the present invention, the PCMCIA interface device is not implemented as an expensive PLD, but has only minimal functions and can be implemented as TTL logic, thereby reducing the burden of cost so that individual users can easily apply it to the system. It is an excellent effect.

Claims (2)

In the PCMCIA (PCMCIA) interface device applied to a system having an interface function of the PCM IC card, Attribute memory access capabilities, PCMCIA interface device, characterized in that the input and output access function is implemented by TTL logic. The method of claim 1, wherein the interface device The AND gate 31 which logically multiplies the signals applied to the nECS0 stage and the nECS1 stage to the AnPCE stage 1 and the nPREG stage simultaneously, and the first or gate outputting the result to the nPOE stage by performing a logical OR of the signals applied to the nECS stage 0 and the nOE stage. 32), a second OR gate 33 for ORing the signals input to the nECSO stage and the nWBEO stage and outputting the result to the nPWE stage, and a signal applied to the nECS1 stage and the signal input to the nOE stage. A third orifice 34 for outputting the result as nPIORD, and a fourth orifice 34 for ORing the signal input to the nECS1 stage and the signal input to the nWBEO stage and outputting the result to the nPIOWR stage. And a fifth or gate 35 which logically combines the signal applied to the nECS1 stage and the signal input to the APWP_nIO stage and outputs it to the AnPCE2 stage, wherein the nWAIT stage is directly connected to the AnPWAIT stage. An interface device for PC MC Kids Day (PCMCIA) card.