JPS63268085A - Portable memory medium reading and writing device - Google Patents

Abstract

PURPOSE:To shorten the time of transmission with the titled device by providing means for changing both a reader/writer part and an IC card into the maximum transmittable Baud rate. CONSTITUTION:A card reader part receives a CPON command from a host and transmits an answer resetting signal to an IC card to receive the maximum Baud rate of the card set at answer resetting data given from the card. If the received answer resetting data is normal, the lower one is selected out of the maximum Baud rate of the received IC card and the transmittable maximum Baud rate of a reader/writer part. Then the card reader part sends the response to the host and receives a Baud rate changing command to set the selected Baud rate to said command and to send this rate to the IC card. Thus the IC card changes the Baud rate by a command.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a portable storage medium reading/writing device that reads and writes information to and from a portable storage medium that stores various types of information.

(Prior Art) In recent years, the development of IC cards (portable storage media) with a large storage capacity for portable information has been progressing. This IC card has a data writer section that reads and writes data (information). Conventionally, this reader/writer section writes data to an IC card inserted into a card insertion slot in response to a command from a host (hereinafter referred to as a host) that instructs the operation. The data is transmitted to the IC card's CPU by so-called serial transmission, which uses a clock signal and is transmitted in the form of a message, to the 1C card's CPU, and the data is sent to the IC card's memory element (RAM) after directly specifying an address from the CPU. . The above serial transmission requires a long transmission time.

(Problem to be solved by the invention) In the conventional device, the CPU of the IC card is
Serial transmission was used to write data by directly specifying an address from the CPU to the memory element.

However, since serial transmission is slower than the processing speed of writing from the IC card's CPU to the memory element, it takes time for the reader/writer section to transmit the data written to the memory element to the IC card's CPU. This results in a decrease in processing capacity. One possible solution to this problem is to increase the baud rate (transmission speed) of the reader/writer section, but the provision of a large number of control circuits makes the device complicated, and a countermeasure has been desperately needed.

This invention has been made in view of the above, and its purpose is to shorten the transmission time between a portable storage medium and a reading/writing unit that reads and writes information to the portable storage medium. An object of the present invention is to provide a portable storage medium reading/writing device.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention provides a first detection means for detecting the maximum transmission speed of a portable storage medium that stores various information. , a second detection means for detecting a maximum transmission speed of a read/write unit that reads and writes information to and from the portable storage medium; and a maximum transmission speed detected by the first detection means and the second detection means. and changing means for changing the transmission speed of the portable storage medium or the reading/writing unit to a lower transmission speed among the transmission speeds.

(Function) In the portable storage medium reading/writing device having the above configuration, the maximum transmission speed of the portable storage medium and the maximum transmission speed of the reading/writing unit that reads and writes information to the portable storage medium are determined. The transmission time can be shortened by detecting the transmission speed and changing the transmission speed of the portable storage medium or the reading/writing unit to a lower transmission speed among the detected transmission speeds.

(Example) Hereinafter, the present invention will be explained in detail using the drawings.

FIG. 1 is an overall view showing an embodiment of a portable storage medium reading/writing device of the present invention. This device transmits commands from a host 1 that instructs an IC card 5 to read and write data, etc. to a reader/writer unit 3, and the reader/writer unit 3 performs various processes on the IC card 5 based on the commands. This is what we do.

FIG. 2 is a diagram showing data transmission of the portable storage medium reading/writing device. In the figure, a host 1 is, for example, a central command unit and sends a command to the reader/writer unit 3 via a data transmission path 7 to instruct the processing functions of the reader/writer unit 3.
After the reader/writer section 3 processes the transmitted command in response to the transmitted command, the reader/writer section 3 receives a response indicating whether the processing has been completed normally or is abnormal via the data transmission path 13. This is for monitoring part 3. If the command transmitted from the host 1 is a reader/writer control command, the reader/writer unit 3 transmits a response to the host 1 after processing it based on the processing function of the command; on the other hand, if the IC card II control command is transmitted Writing data to the IC card 5 or changing the baud rate is transmitted via the data transmission line 9.
A response indicating the end of processing is transmitted from the C card 5 via the data transmission path 11 and is transmitted to the receiving host 1.

FIG. 3 is a block diagram showing the configuration of the reader/writer section 3, in which the host interface circuit 15. Control circuit 17. Data storage circuit 19. It has a card interface circuit 21.

The host interface circuit 15 controls the transmission of commands transmitted from the host 1 or responses transmitted from the reader/writer unit 3.

The control circuit 17 includes the reader/writer section 3 and the IC card 5.
A CPU 23 detects the maximum baud rate (transmission speed) that can be transmitted and controls command designation to change the baud rate of the reader/writer section 3 or IC card 5;
a parallel boat 25 that controls input/output of transmission based on command specifications from the parallel boat 23; and a clock generator 2 that generates a clock signal in response to the specifications of the parallel boat 25.
7. That is, this control circuit 17
detects the maximum baud rate of the reader/writer section 3 and IC card 5 and changes the baud rate of the reader/writer section 3 or IC card 5 to a baud rate lower than this maximum baud rate.

Note that the default value of the baud rate of the reader/writer unit 3 is 9600 baud.

The data storage circuit 19 has, for example, a RAM, and the data storage circuit 19 stores commands transmitted from the host 1 in the control circuit 17.
The data received and checked by the PU 23 one byte at a time is stored at a predetermined address.

The card interface circuit 21 controls the transmission of an IC card control command, which will be described later, transmitted from the control circuit 17 to the IC card 5, or the transmission of a response from the IC card 5.

FIG. 4 is a control block diagram showing the configuration of the IC card 5, which includes an interface circuit 29 for controlling transmission with the reader/writer section 3, a CPU 31, and a memory element 3.
3.

The CPLI 31 controls changes in baud rate and the like in response to commands transmitted via the interface circuit 29.

The storage element 33 has a RAM and stores personal data of the person carrying the IC card 5.

FIG. 5 is a diagram showing commands transmitted from the host 1 to the reader/writer unit 3. In the figure, a reader/writer (R/W) for detecting the control state of the reader/writer unit 30 is shown.
It has a control command and an IC card control command for controlling the IC card 5. The reader/writer control command includes rRWsTJ, which checks whether the number of bytes that can be written to the IC card 5 by the reader/writer unit 3, and the IC card 5.
rcPONJ, which supplies power to and receives the maximum baud rate of IC card 5, and rcPOF, which turns off power to the IC card.
J, rcOU to eject IC card 5 from card insertion slot
There is Tj. On the other hand, IC card control commands include
“5AD” specifies the address of the memory element 33 of the card 5.
R'', rRMEMJ for reading data stored in the memory element 33 of the IC card 5, and rWMFMJ for writing data to the memory element 33.

FIG. 6 is a diagram showing a command transmitted from the reader/writer section 3 to the IC card 5. When this command is transmitted from the reader/writer section 3 to the CPtJ31 of the IC:fl-card 5, the CPU is activated in response to the command. Control. In the same figure,
rsADRJ, rRMEMJ, and rWMEMJ are as described above. In addition, there is a change baud rate rcHBRJ that changes the baud rate of the IC card 5. When the change baud rate r and cl-IBRJ are transmitted, the CPU 31
is used to change the baud rate specified by IC)-(BRJ.

Next, the operation of this embodiment will be explained using the processing flowchart shown in FIG.

First, after powering on the reader/writer unit 3, the host 1
The ST command is transmitted via the transmission path 7, and the response transmitted from the reader/writer section 3 causes the reader/writer section 3 to
is operating normally, whether the IC card 5 is inserted or not, and whether the IC card 5 is inserted or not.
Check whether the power to the C card 5 is turned on or off. After confirmation, the host 1 transmits a CIN command, and after the reader/writer unit 3 captures the 10 card 5, transmits a CPON command (step 100).

When the CPON command is transmitted, the reader/writer section 3
Supply power to the C card 5 and send an answer to the IC card 5.
In response to this answer reset by transmitting a reset, I
The maximum baud rate of the IC card 5 set in the answer-reset data transmitted from the C-card 5 is received, and a waiting state is entered until this answer-reset data is received (steps 110 to 130).

If the received answer-reset data is incorrect, the process proceeds to step 220; if the data is normal, the process proceeds to step 22 if the IC card 5 is not a data-writable support card.
If the card is a support card, a lower baud rate is selected between the maximum baud rate of the IC card 5 and the maximum baud rate that can be transmitted by the reader/writer section 3. here,
For example, if the maximum baud rate of the IC card 5 is 19,200 baud and the maximum baud rate of the reader/writer section 3 is 76,800 baud, the maximum baud rate of the IC card 5 of 19,200 baud is selected (steps 140 to 160).

After selecting the baud rate, the reader/writer section 3 transmits a response to the host 1 and receives the C and IBR from the small station 1. The reader/writer unit 3 sets the selected baud rate in the CHBR command and transmits it to the IC card 5. IC
When card 5 receives the CHBR command, this CI-
The data of the IBR command is checked, and if it is normal, the CPU 31 of the IC card 5 changes the baud rate to 19200 baud set in the received CHBR command, and if the CHBR command is not normal, the process goes to step 220 (step 170-200).

When the IC card 5 changes the baud rate, the reader/writer section 3 sets a normal end response and transmits it to the host 1, and if the CI-I B R command to the IC card 5 is abnormal, it sets a code indicating an abnormal state. and transmits the response to host 1 (steps 210 to 220).

As a result, the maximum baud rate that can be transmitted between the reader/writer section 3 and the IC card 5 is changed, so that the transmission time between the reader/writer section 3 and the IC card 5 can be shortened.

[Effects of the Invention] As explained above, according to the present invention, the maximum transmission speed of the portable storage medium and the maximum transmission speed of the reading/writing unit that reads and writes information to the portable storage medium are achieved. and changes the transmission speed of the portable storage medium or the reading/writing unit to a lower transmission speed among the detected transmission speeds, so that information can be read and written to the portable storage medium and the portable storage medium. It is possible to shorten the transmission time with the reading/writing section that performs the processing.

[Brief explanation of drawings]

FIG. 1 is an overall view of the portable storage medium reading/writing device of the present invention, FIG. 2 is a diagram showing data transmission of the portable storage medium reading/writing device of the invention, and FIG. 3 is the configuration of the reader/writer section. 4 is a block diagram showing the configuration of the IC card, FIG. 5 is a diagram showing commands transmitted from the host to the reader/writer section, and FIG. 6 is a diagram showing commands transmitted from the reader/writer section to the IC card. FIG. 7, which is a diagram showing commands, is a flowchart 11 showing the operation of the present invention. 1...Host

Claims (2)

[Claims] (1) A first detection means that detects the maximum transmission speed of a portable storage medium that stores various information, and a maximum transmission speed of a reading/writing unit that reads and writes information to the portable storage medium. a second detection means for detecting the speed; and setting the transmission speed of the portable storage medium or the reading/writing unit to the lower transmission speed of the maximum transmission speed detected by the first detection means and the second detection means. A portable storage medium reading/writing device characterized by having: a changing means for changing. (2) The portable storage medium of the first detection means is I
Claim 1 characterized in that a C card is used.
The portable storage medium reading/writing device according to paragraph 1.