JP2002073284A - Recorder-reproducer, recording-reproducing method, storage medium, recorder and reproducer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a recorder-reproducer which can deal with the characteristics of various types of memory cards while keeping a high data rate secured by a communication clock of high frequency. SOLUTION: A CPU 11 reads a card ID stored in a characteristic data memory 16 (S6) and confirms whether the characteristic information such as an operation frequency and a reception sampling point are already stored (S7). When these characteristic information are not stored yet, the card ID is stored in the memory 16 (S8). A command is transmitted and received via a card interface part 12 and the acquired operation frequency is stored in a desired data area of the memory 16 (S10). A communication clock MCLK approximate to the acquired operating frequency is set at a communication clock generation part (S11). Then a data read command given from a memory card 13 is transmitted and the reception sampling point is decided for reception of the command answer, etc., (S12-S14).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing apparatus, a recording / reproducing method, and a recording medium for recording / reproducing a recording medium such as a memory card used in a computer, a digital camera, a PDA (Personal Digital Assistant) and the like. And a recording device and a reproducing device.

[0002]

2. Description of the Related Art FIG. 11 is a diagram showing a configuration of a conventional memory card recording / reproducing apparatus. In the figure, 101 is a CPU
It is. Reference numeral 102 denotes a memory card interface unit. 103 is a removable memory card. 104 is a CPU bus. 105 is another processing unit.

The entire memory card interface unit 102 operates in synchronization with the rise of the system clock CLK. The CPU 101 inputs and outputs a control signal CPUCNT to and from the CPU bus 104, and controls the memory card interface unit 102 and other processing units 105.

[0004] Memory card interface unit 102
Is a control signal from the CPU 101 via a signal I / FCNT from the CPU bus 104,
And the write data from the other processing unit 105, and
Command and write data are transmitted via the command signal CMD and the data signal DAT.

A command response and read data are received from the memory card 103 via the above-mentioned signals CMD and DAT, and the CPU receives a signal via a signal I / FCNT.
The command response and the read data are transferred to the bus 104. The command response is sent to the CPU via the signal CPUCNT.
101, the read data is the signal BLKI / O
Is transferred to another processing unit 105 via the.

Further, a memory card interface unit 1
02 to the memory card 103 from the communication clock MC
LK is output. The communication clock MCLK is generated by dividing the system clock CLK.
The frequency (frequency division ratio) can be changed by setting from the CPU 101.

FIG. 12 is a flowchart showing a conventional card processing procedure. CPU 101 is a memory card 103
Is started (step S1).
01). This detection is performed by the CPU 101 referring to an insertion detection terminal on the memory card slot.

The presence or absence of the memory card 103 is determined (step S102). If it is determined that no memory card is inserted, the process returns to step S101. on the other hand,
When it is determined that a memory card is inserted, a sufficient setup and hold time can be secured with respect to the rise of the system clock CLK when receiving the command signal CMD and the data signal DAT, so that recognition of the memory card is not hindered. The frequency of the low-speed communication clock MCLK is set in the memory card interface unit 102 (step S103).

Thereafter, commands are transmitted and received from the memory card interface unit 102 to recognize the memory card (step S104). The operating frequency information at the time of data transfer of the memory card is obtained (step S105),
The communication clock is reset in the memory card interface unit 102 based on the operating frequency information (step S
106). Using the reset communication clock, the memory card interface unit 102 transmits and receives commands and transmits and receives data (step S107).

[0010]

However, the above-mentioned conventional recording / reproducing apparatus has the following problems, and improvement thereof has been demanded. In other words, the command sampling from the memory card 103 to the memory card interface unit 102 and the reception sampling point of the read data in the system clock CLK are fixed.
Depending on the characteristics of the card inserted in the card slot,
The time at which the command response and the received data from the card are output differs from the reference of the communication clock signal MCLK. For this reason, when the frequency of the communication clock MCLK is high, the setup / hold time may not be secured when the memory card interface unit 102 captures data, and normal communication may not be performed.

Normally, when the frequency of the communication clock MCLK is a low frequency equal to or more than four times the frequency of the system clock CLK, the command response and the read data are transferred to the synchronization D flip-flop (D
-FF) and the like, and then treat the data as data synchronized with the system clock CLK. However, if the frequency of the communication clock MCLK is a high frequency of 分 the frequency of the system clock CLK, the above-mentioned synchronization is performed. For D
There was a problem that the setup and hold time could not be secured even with the use of -FF, and this was not a reliable method.

Therefore, the present invention can detect various characteristics of a memory card while detecting a characteristic of the memory card and performing communication based on the information, thereby maintaining a high data rate by a high-frequency communication clock. It is an object to provide a recording / reproducing device, a recording / reproducing method, a storage medium, a recording device, and a reproducing device.

[0013]

According to a first aspect of the present invention, there is provided a recording / reproducing apparatus for recording / reproducing on / from a removable recording medium. Interface means for extracting characteristic information necessary for transmitting and receiving information to and from the recording medium, and communicating with the recording medium based on the extracted characteristic information; and control means for controlling the interface means. It is characterized by having.

[0014] The information processing apparatus may further include characteristic information storage means for storing the extracted characteristic information in association with identification information unique to the recording medium.

Further, the interface means includes: an error detection code generation means for generating a first error detection code from the received control command response; the generated first error detection code; And comparing means for comparing the second error detection code with the second error detection code, and detecting the occurrence of a communication error as a result of the comparison.

Further, the interface means includes an error detection code generating means for generating a third error detection code from the read data, a third error detection code generated, and a fourth error detection code included in the read data. Comparing means for comparing with an error detection code, and detecting the occurrence of a communication error as a result of the comparison.

Further, the interface means, when extracting a first reception sampling point for receiving the control command response, which is a part of the extracted characteristic information, when the communication error is detected, The process of changing the reception sampling point and receiving the control command response again is repeated until the communication error disappears, and the reception sampling point when the communication error disappears is set as the first reception sampling point. And

[0018] When extracting a second reception sampling point for receiving the read data, which is a part of the extracted characteristic information, the interface means may receive the second error signal if the communication error is detected. The process of changing the sampling point and receiving the read data again is repeated until the communication error disappears, and the reception sampling point when the communication error disappears is set as the second reception sampling point. I do.

Further, when the identification information read from the recording medium and the identification information corresponding to the characteristic information stored in the characteristic information storage means do not match, the identification information corresponding to the read identification information is matched. The characteristic information of the recording medium is stored in the characteristic information storage means.

Further, when the identification information read from the recording medium matches the identification information corresponding to the characteristic information stored in the characteristic information storage means, based on the stored characteristic information, It is characterized by transmitting and receiving information to and from a recording medium.

Further, the recording medium is a memory card, and the memory card is mounted on the interface means.

According to a tenth aspect of the present invention, there is provided a recording / reproducing method for recording / reproducing on / from a detachable recording medium, wherein characteristic information necessary for transmitting / receiving information to / from the recording medium is provided. And a step of communicating with the recording medium based on the extracted characteristic information.

Further, the method further comprises a step of storing the extracted characteristic information in association with the identification information unique to the recording medium.

According to a twelfth aspect of the present invention, there is provided a storage medium which is executed by a computer and stores a program for recording / reproducing on / from a removable recording medium. A procedure for extracting characteristic information necessary for transmitting and receiving information between the two, and a procedure for communicating with the recording medium based on the extracted characteristic information.

Further, the program includes a step of storing the acquired characteristic information in association with identification information unique to the recording medium.

According to a fourteenth aspect of the present invention, in the recording apparatus for recording on a detachable recording medium, characteristic information necessary for transmitting and receiving information to and from the recording medium is extracted, An interface unit for communicating with the recording medium based on the extracted characteristic information, and a control unit for controlling the interface unit.

[0027] Further, there is provided a characteristic information storage means for storing the extracted characteristic information in association with identification information unique to the recording medium.

A reproducing apparatus according to a sixteenth aspect is a reproducing apparatus for reproducing from a removable recording medium, wherein characteristic information necessary for transmitting and receiving information to and from the recording medium is extracted, An interface unit for communicating with the recording medium based on the extracted characteristic information, and a control unit for controlling the interface unit.

[0029] Further, it is characterized in that a characteristic information storage means for storing the acquired characteristic information in association with identification information unique to the recording medium is provided.

[0030]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a recording / reproducing apparatus, a recording / reproducing method, a storage medium, a recording apparatus, and a reproducing apparatus according to the present invention will be described with reference to the drawings. The recording / reproducing device according to the present embodiment is applied to a memory card recording / reproducing device that performs recording / reproducing on an inserted memory card.

[First Embodiment] FIG. 1 is a block diagram showing the configuration of a memory card recording / reproducing apparatus according to the first embodiment. In the figure, reference numeral 11 denotes a CPU including a microcomputer having a ROM, a RAM, and the like. 1
Reference numeral 2 denotes a memory card interface unit. Reference numeral 13 denotes a removable memory card. 14 is a CPU bus. Reference numeral 15 denotes another processing unit. Reference numeral 16 denotes a characteristic data memory for storing characteristic data of the memory card 13 to be inserted.

The memory card interface unit 12
It comprises a command buffer 17 for transmitting and receiving commands, a data buffer 18 for transmitting and receiving data, an error detection code generator 19 for generating an error detection code based on the received command response or read data, and a communication clock generator 20. You. The entire memory card interface unit 12 operates in synchronization with the rise of the system clock CLK.

The communication clock generator 20 generates the communication clock MCLK by dividing the system clock CLK. The frequency (division rate) can be changed by setting the communication clock generator 20 from the CPU 11. Is possible. Then, the communication clock generator 20 controls transmission and stop of the communication clock MCLK.

Here, the sampling point when the command buffer 17 and the data buffer 18 receive the command response and the received data, respectively, is determined by the communication clock M
It is possible to shift based on CLK.

FIGS. 2 and 3 are flowcharts showing the card detection / communication processing procedure. This processing program is stored in the ROM in the CPU 11 and is executed by the CPU 11. In this processing program, processing from the card detection of the memory card recording / reproducing device to the communication operation is performed.

First, detection of the memory card 13 is started (step S1). This detection is performed by the CPU 11 referring to an insertion detection terminal provided in the memory card slot. Then, as a result of the detection, it is determined whether or not the memory card 13 is inserted (step S2). If the memory card 13 is not inserted, the process of step S1 is repeated.

On the other hand, when the memory card 13 is inserted, the CPU 11
The frequency of the communication clock MCLK is set for Step 2 (Step S3). This setting is based on the signal CPUCNT from the CPU 11, the CPU bus 14, and the signal MCLKCN.
Via T. Here, the set frequency is obtained by dividing the frequency of the system clock CLK. When a command response and read data are received, a sufficient setup and hold time can be secured with respect to the rise of the system clock CLK, and the memory card It is set to a low value that does not hinder recognition.

The card is recognized by transmitting and receiving commands from the memory card interface unit 12 (step S4). FIG. 4 is a diagram showing a card recognition operation. CP
In the operation of U11, the signal CPUCNT, the CPU bus 14
And command buffer 17 via signal CMDCNT.
(Step 34 in FIG. 4).

Based on the control from the CPU 11, the command buffer 17 transmits a command to the memory card 13 via a signal CMD (35 in FIG. 4), and thereafter, sends a command response issued from the memory card 13 to the signal CMD. (36 in FIG. 4). At the same time, the error detection code generation unit 19 receives the command response received from the command buffer 17 via the signal R_CMD, and generates an error detection code (37 in FIG. 4).

FIG. 5 is a diagram showing the configuration of a command response. The command response includes a start bit (1 bit), response content (mbit), an error detection code (nbit), and an end bit (1 bit). The target of generation by the error detection code generation unit 19 is a response content portion. Thereafter, the CPU 11 outputs the signal CMDCN.
T, via the CPU bus 14 and the signal CPUCNT,
The error detection code received by the command buffer 17 and the error detection code generated by the error detection code generation unit 19 are referred to and compared to check whether they match. That is,
For transmission and reception of this command, confirm that there is no communication error due to noise or the like on the transmission path.

Here, when there is a communication error, 3 in FIG.
The processing operations 4 to 38 are repeated a plurality of times until the communication error is eliminated. If the communication error does not disappear even after the predetermined number of repetitions, it is determined that the memory card cannot be handled due to another problem, and exception processing (not shown) is performed. On the other hand, if there is no communication error, the content of the command response is confirmed.

A command is transmitted and received from the memory card interface unit 12 (step S5), and a card ID including information such as a memory card manufacturer and a model name is transmitted.
To get. This operation is similar to the operation in step S4.
A command is transmitted and a command response is received, and the information of the card ID included in the command response is transmitted to the CPU 1.
1 is performed by reference.

The CPU 11 sends the card ID already stored in the characteristic data memory 16 to the signal MEMI / O,
Reading is performed via the bus 14 and the signal CPUCNT (step S6), and it is confirmed whether or not characteristic information such as an operating frequency and a reception sampling point has already been stored, that is, whether or not this is a new type of card (step S6).
7). If the characteristic information has not been stored yet, the card ID is stored in the characteristic data memory 16 (step S).
8).

FIG. 6 is a diagram showing the configuration of the characteristic data memory 16. In the present embodiment, the card ID and the corresponding operating frequency, command reception sampling point and data reception sampling point are stored in a predetermined area in the same word of the memory.

Commands are transmitted and received via the card interface unit 12 to obtain operating frequency information of the memory card 13 (step S9). This operation is performed by transmitting a command and receiving a command response as in the operation of step S4, and by causing the CPU 11 to refer to information on the operating frequency included in the command response.

Thereafter, the information on the operating frequency obtained in step S9 is stored in a desired data area of the characteristic data memory 16 (step S10). Similar to the operation in step S3, the frequency division ratio corresponding to the communication clock MCLK as close as possible to the operating frequency obtained in step S9 is set in the communication clock generator 20 (step S11). Subsequent processing is performed by communication at a high operating frequency.

Thereafter, transmission of a data read command from the memory card 13, reception of a command response, and determination of a reception sampling point of the command buffer 17 are performed (steps S12 to S14).

FIG. 7 is a diagram showing a command response operation. The CPU 11 transfers the read command to the command buffer 17 via the signal CPUCNT, the CPU bus 14 and the signal CMDCNT (65 in FIG. 7). And C
Based on the control from the PU 11, the command buffer 17 transmits a command to the memory card 13 via a signal CMD (66 in FIG. 7), and then transmits a command response issued from the memory card 13 via a signal CMD. It receives (67 of FIG. 7, step S12). At the same time, the error detection code generator 19 receives the command response received by the command buffer 17 via the signal R_CMD, and generates an error detection code for the command response (68 in FIG. 7).

Here, the command response is as shown in FIG. 4 described above, and the error detection code generation unit 19 generates a response content portion. After this, the CPU
11 is a signal CMDCNT, a CPU bus 14 and a signal C
The error detection code received by the command buffer 17 and the error detection code for the command response generated by the error detection code generation unit 19 are referenced and compared via the PUCNT, and it is confirmed whether or not they match. Regarding the transmission and reception of the command, it is confirmed whether or not there is a communication error (step S
13).

If it is determined in step S13 that there is a communication error, the processing of steps 65 to 69 in FIG. 7 is repeated until the communication error disappears. If the communication error does not disappear even after repeating the predetermined number of times, it is determined that the cause of the communication error is not a noise on the transmission path, but a problem in the reception sampling point for the command response of the command buffer 17 and the command buffer 17 Is changed (step S14), and 65 in FIG. 7 is changed.
Steps 69 to 69 are repeated until the communication error is eliminated. If the communication error does not disappear even after repeating the predetermined number of times,
Judging that the memory card cannot be handled for another reason,
Exception processing (not shown) is performed.

On the other hand, if no communication error occurs in response to the command response in step S13, read data is received (step S15). In this process, the reception data from the memory card 13 is continuously received via the signal DAT, and when the data buffer 18 is configured by a FIFO memory, the signal DATCNT and the CPU bus 14
And a signal BLKI / O to another processing unit 15 (70 in FIG. 7).

At the same time, the error detection code generator 19 converts the received data received by the data buffer 18 into a signal R_DA
Received via T (71 in FIG. 7), and generates an error detection code for the received data. FIG. 8 is a diagram showing a configuration of a communication unit for one read command in received data. This communication unit includes a start bit (1 bit), read data (pbit), and an error detection code (qbi).
t) and an end bit (1 bit). The error detection code generation unit 19 generates the read data portion, and after receiving data for one communication unit, the error detection code generation unit 19 stores the error detection code in the data buffer 18.
Is stored in

Thereafter, the CPU 11 outputs the signal CMDCN
T, via the CPU bus 14 and the signal CPUCNT,
The error detection code received by the data buffer 18 and the error detection code for the command response generated by the error detection code generation unit 19 are referred to and compared to confirm whether or not they match. It is checked whether there is a communication error due to noise or the like on the transmission path (step S16).

Here, when there is a communication error, it is assumed that 6 in FIG.
Steps 5 to 72 are repeated several times until the communication error is eliminated. If the communication error does not disappear even after the predetermined number of repetitions, it is determined that the cause of the communication error is not the noise on the transmission path but the reception sampling point for the reception data in the data buffer 18 is problematic. Is changed (step S17), and the processing of steps 65 to 72 in FIG. 7 is repeated until the communication error is eliminated. Even if it is repeated a predetermined number of times,
If the communication error does not disappear, it is determined that the memory card cannot be handled for another reason, and exception processing (not shown) is performed.

In this embodiment, it is assumed that the delay of the command response to the communication clock MCLK from the memory card 13 to the memory card interface unit 12 is different from the delay of the received data. The reception sampling points set in the buffer 18 are determined separately.

FIG. 9 is a timing chart showing changes in the system clock CLK, communication clock MCLK, command response or read data, and the reception timing setting counter. Referring to FIG.
7. A method of setting a reception sampling point for a command response of the data buffer 18 and reception data will be described. The communication clock MCLK is generated by the communication clock generator 20.
Is set to divide the frequency of the system clock CLK by two.

The timing of the command response or the read data is set with respect to the rise of the communication clock MCLK.
The input is delayed by the delay time D. Command buffer 17
Alternatively, the reception timing setting counter inside the data buffer 18 counts up in synchronization with the rise of the system clock CLK, and is cleared to “0” every cycle of the communication clock MCLK.

According to the setting from the CPU 11, when the counter has an arbitrary value, it is possible to sample a command response or received data at the rising edge of the system clock signal CLK. For example, in FIG. 9, when the reception sampling point is in the figure, the timing coincides with the timing at which the command response or the reception data changes, so that the setup and the rising of the system clock CLK are performed.
Since a hold time cannot be secured, a communication error occurs. In this case, by shifting the receiving sampling point to, the setup and hold time can be secured for the rise of the system clock CLK, and the occurrence of a communication error can be avoided.

The information (set value) of the reception sampling point determined in the processing of steps S12 and S15 is stored in a desired area of the characteristic data memory 16 (step S15).
18). Using the determined operating frequency and the set value of the reception sampling point, communication such as data reading and data writing is continued (step S19). Thereafter, the process ends.

On the other hand, in step S7, step S
If the card ID acquired in Step 6 is stored in the characteristic data memory 16, the information of the operating frequency and the reception sampling point is read out and set in the memory card interface unit 12 (Step S20). The communication is continued with the set value (step S19), and the process ends.

As described above, in the present embodiment, it is possible to cope with the characteristics of any memory card with respect to reception. In particular, in the case of a memory card of a manufacturer and a model name with which communication has been made before, in the case of step S7, After the processing, the data read and write operations can be started by the simplified communication processing of steps S20 and S19.

Further, the card I of a plurality of types of memory cards expected to communicate with the characteristic data memory 16 in advance
It is also possible to record D, the corresponding operating frequency and reception sampling point, and start the data read / write operation by a simplified communication process from the beginning.

[Second Embodiment] The memory card recording / reproducing apparatus according to the second embodiment is different from the first embodiment in that the characteristic data memory 16 is used from the viewpoint of cost reduction.
Are omitted, and the other configuration is the same as that of the first embodiment.

FIG. 10 is a flowchart showing a card detection / communication processing procedure in the second embodiment. This processing program is stored in the ROM in the CPU 11 and is executed by the CPU 11. In this processing program, processing from the card detection of the memory card recording / reproducing device to the communication operation is performed.

Steps S31 to S34 are the same as steps S1 to S4 in the first embodiment. In step S35, similarly to the processing in step S9, commands are transmitted and received from the card interface unit 12, and the operating frequency of the memory card 13 is obtained.

In the process of step S36, step S1
Similarly to 1, the frequency division ratio for the communication clock MCLK as close as possible to the operating frequency obtained in step S35 is set in the communication clock generation unit 20. Thereafter, communication is performed at a high operating frequency.

In the processing of steps S37 to S42, similarly to the processing of steps S12 to S17, a reception sampling point is determined, and a command response and read data are received. Thereafter, communication such as data reading and writing is continued using the operating frequency and the set value of the reception sampling point determined in the above processing (step S4).
3), end the process.

As described above, in the second embodiment, even if the memory card is of a manufacturer and a model name with which it has communicated before, the operation frequency information is obtained in step S35, and the reception sampling is performed in steps S37 to S42. Processing such as determination of points occurs, and it takes some time to actually start data read and write operations as compared with the first embodiment.
6, the recording and reproduction of the memory card corresponding to the characteristics of all memory cards can be realized while reducing the cost.

Although the embodiments of the present invention have been described above, the present invention is not limited to the configurations of the embodiments, and the functions described in the claims or the functions of the embodiments are described. Any configuration that can achieve the function of the configuration is applicable.

For example, in the above embodiment, the case where the present invention is applied to a card type recording medium has been described. However, the present invention is also applicable to an IC package type recording medium having a plurality of pins, a disk type recording medium, and the like. It is.

Further, it goes without saying that the present invention can also be applied to a case where the recording medium storing the program codes of the software for realizing the functions of the above-described embodiments can be achieved by supplying a program to the apparatus. .
In this case, the program code itself read from the storage medium implements the novel function of the present invention, and the storage medium storing the program constitutes the present invention.

In the above embodiment, the program codes shown in the flowcharts of FIGS. 2, 3, and 10 are stored in the ROM in the microcomputer as the storage medium.
In addition, as a storage medium for supplying the program code, for example, a floppy (registered trademark) disk, a nonvolatile memory card, or the like can be used.

[0073]

According to the present invention, when receiving a command response and read data from a recording medium (memory card), a communication error can be detected and the reception sampling point can be changed. Reception is possible even when the frequency of the system clock is divided by 2 and the frequency is high.

By storing the characteristic information in the characteristic information storage means (characteristic data memory), the memory card of the same maker and model name can perform the data read / write operation in a simplified communication procedure. It is possible to get started. Therefore, it is possible to support all kinds of memory cards and to maximize the performance of the memory card.

As described above, by detecting the characteristics of the memory card and performing communication based on the information, it is possible to cope with various characteristics of the memory card while maintaining a high data rate by a high-frequency communication clock.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a memory card recording / playback device according to a first embodiment.

FIG. 2 is a flowchart showing a card detection / communication processing procedure.

FIG. 3 is a flowchart illustrating a card detection / communication processing procedure following FIG. 2;

FIG. 4 is a diagram showing a card recognition operation.

FIG. 5 is a diagram showing a configuration of a command response.

FIG. 6 is a diagram showing a configuration of a characteristic data memory 16;

FIG. 7 is a diagram showing an operation of a command response.

FIG. 8 is a diagram showing a configuration of a communication unit for one read command in received data.

FIG. 9 shows a system clock CLK and a communication clock MCL.
7 is a timing chart showing changes in K, a command response or read data, and a reception timing setting counter.

FIG. 10 is a flowchart illustrating a card detection / communication processing procedure according to the second embodiment.

FIG. 11 is a diagram showing a configuration of a conventional memory card recording / reproducing apparatus.

FIG. 12 is a flowchart showing a conventional card processing procedure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 CPU 12 Interface part 13 Memory card 16 Characteristic data memory 17 Command buffer 18 Data buffer 19 Error detection code generation part 20 Communication clock generation part

Claims (17)

[Claims] 1. A recording / reproducing apparatus for recording / reproducing on / from a removable recording medium, wherein characteristic information necessary for transmitting / receiving information to / from the recording medium is extracted, and the extracted characteristic information is extracted. A recording / reproducing apparatus comprising: an interface unit that communicates with the recording medium based on the control unit; and a control unit that controls the interface unit. 2. The recording / reproducing apparatus according to claim 1, further comprising characteristic information storage means for storing the extracted characteristic information in association with identification information unique to the recording medium. 3. An error detection code generating means for generating a first error detection code from a received control command response, the generated first error detection code, and the received control command response. 3. The recording / reproducing apparatus according to claim 1, further comprising: comparing means for comparing with a second error detection code included in the above, and detecting the occurrence of a communication error as a result of the comparison. 4. The error detecting code generating means for generating a third error detecting code from the read data, the third error detecting code generated, and a fourth error detecting code included in the read data. 3. The recording / reproducing apparatus according to claim 1, further comprising comparison means for comparing the error detection code with the error detection code, and detecting the occurrence of a communication error as a result of the comparison. 5. The communication device according to claim 1, wherein the interface unit detects a communication error when extracting a first reception sampling point for receiving the control command response, which is a part of the extracted characteristic information. The process of changing the reception sampling point and receiving the control command response again is repeated until the communication error disappears, and the reception sampling point when the communication error disappears is set as the first reception sampling point. The recording / reproducing apparatus according to claim 3, wherein 6. The method according to claim 1, wherein the interface unit detects a communication error when extracting a second reception sampling point for receiving the read data, which is a part of the extracted characteristic information. The process of changing the sampling point and receiving the read data again is repeated until the communication error disappears, and the reception sampling point when the communication error disappears is set as the second reception sampling point. The recording / reproducing apparatus according to claim 4, wherein 7. When the identification information read from the recording medium and the identification information corresponding to the characteristic information stored in the characteristic information storage unit do not match, the identification information corresponding to the read identification information corresponds to the identification information. 3. The recording / reproducing apparatus according to claim 2, wherein the characteristic information of the recording medium is stored in the characteristic information storage unit. 8. When the identification information read from the recording medium matches the identification information corresponding to the characteristic information stored in the characteristic information storage means, the identification information is stored on the basis of the stored characteristic information. 3. The recording / reproducing apparatus according to claim 2, wherein information is transmitted / received to / from a recording medium. 9. The recording / reproducing apparatus according to claim 1, wherein the recording medium is a memory card, and the memory card is mounted on the interface unit. 10. A recording / reproducing method for recording / reproducing information on / from a removable recording medium, comprising: a step of extracting characteristic information necessary for transmitting / receiving information to / from the recording medium; Performing a communication with the recording medium based on the characteristic information. 11. The recording / reproducing method according to claim 10, further comprising a step of storing the extracted characteristic information in association with identification information unique to the recording medium. 12. A storage medium which is executed by a computer and stores a program for recording / reproducing on / from a removable recording medium, wherein the program transmits / receives information to / from the recording medium. A storage medium comprising: a procedure for extracting characteristic information necessary for the operation; and a procedure for communicating with the recording medium based on the extracted characteristic information. 13. The recording medium according to claim 12, wherein the program includes a step of storing the acquired characteristic information in association with identification information unique to the recording medium. 14. A recording apparatus for recording on a removable recording medium, wherein characteristic information necessary for transmitting / receiving information to / from the recording medium is extracted, and based on the extracted characteristic information. A recording apparatus comprising: an interface unit that communicates with the recording medium; and a control unit that controls the interface unit. 15. The recording apparatus according to claim 14, further comprising characteristic information storage means for storing the extracted characteristic information in association with identification information unique to the recording medium. 16. A reproducing apparatus for reproducing data from a removable recording medium, wherein characteristic information necessary for transmitting / receiving information to / from the recording medium is extracted, and based on the extracted characteristic information. A reproducing apparatus comprising: an interface unit that communicates with the recording medium; and a control unit that controls the interface unit. 17. The reproducing apparatus according to claim 16, further comprising characteristic information storage means for storing the acquired characteristic information in association with identification information unique to the recording medium.