JP5169365B2 - SD memory communication system and SD memory communication system - Google Patents

Description

  The present invention relates to an SD memory type communication device and a data transfer program in the SD memory type communication device, and more particularly to an SD memory type communication device capable of transferring data without interrupt control and the SD memory type communication system.

  2. Description of the Related Art In recent years, many portable information terminals such as cellular phones are sold that are equipped with an SD (Secure Digital) card slot and that can use an SD card memory as an external storage means. The SD card memory is a small, thin, low power, low power consumption portable information terminal having a copyright protection function for content. By using the SD card memory, the portable information terminal can perform processing such as recording, editing, and transfer of a large amount of data such as image information and moving image information.

Further, as a peripheral device capable of inputting / outputting data with the same terminal shape as an SD card, there is a so-called SDIO card, which is connected to an SD card type functional device via an SD card slot. Various functions can be performed. For example, the functions of the SDIO card are representative of functions such as a Bluetooth (registered trademark) communication card, a PHS communication card for data communication, a wireless LAN card, a small digital camera card, a one-segment tuner card, and a GPS system card. is there.
The SD memory type communication device is a kind of such an SDIO card, which is equipped with a short-range wireless communication device, communicates with a sensor node using this communication device, and transmits data collected by the sensor node to a portable information terminal. Has the ability to collect.
Hiroto Okada / Tomohiro Yokoyama, Chapter 8 Overview of Multimedia Cards & SD Cards, “Thorough Research on PC Cards / Memory Cards”, CQ Publishing Company, October 1, 2002, p.216-p.230

  By the way, the SDIO driver IC provided on the portable information terminal side is used for signal control of the conventional SDIO card. This SDIO driver IC performs input / output control by interrupt control, and there is a problem that it is necessary to manufacture each peripheral device, and there is a problem that the price of the SDIO driver IC is relatively expensive. On the other hand, existing SD cards can be used and do not need to be manufactured.

  Therefore, the present invention uses an SD specification interface used for controlling an SD card memory, and performs an input / output control as if it were a memory to enable data transfer and It is an object to realize an SD memory type communication system.

In order to solve the above problems, an SD memory type communication device according to one aspect of the present invention includes a control unit, a wireless transmission / reception unit, and an SD bus terminal connected to a host device. An SD memory type communication device for transferring data to and from a transceiver unit, wherein the control unit is connected between the SD bus terminal and the wireless transceiver unit via a first buffer memory and a second buffer memory. in have line data transfer, when performing the data transfer, while reading data written to one buffer memory, characterized in that the memory switching control for writing the different data to the other buffer memory The configuration is as follows.

The first buffer memory and the second buffer memory transfer input data from the SD bus terminal to the wireless transmission / reception unit, and transfer output data from the wireless transmission / reception unit to the SD bus terminal. And an output buffer memory.
Further, an input buffer memory from the previous SL SD bus pins for transferring the input data to the radio transmitting and receiving unit, an output buffer memory for transferring output data from the wireless transceiver to the SD bus terminals, respectively, said first buffer A memory and the second buffer memory are provided.

  Further, the write function to the input buffer memory and the read control from the output buffer memory are configured to be performed by polling control.

  Another means of the present invention comprises a control unit, a wireless transmission / reception unit, and an SD bus terminal connected to a host device, and transfers data between the SD bus terminal and the wireless transmission / reception unit via a buffer memory. An SD memory type communication device, wherein the control unit creates a pseudo FAT (File Allocation Table) so that the SD memory type communication device has a file format required by the host device, and the buffer memory Is provided with a memory control means for responding as a pseudo SD memory.

  The buffer memory includes both an input buffer memory that transfers input data from the SD bus terminal to the wireless transmission / reception unit, and an output buffer memory that transfers output data from the wireless transmission / reception unit to the SD bus terminal, A memory control unit configured to read the input data from the SD bus terminal in response to a data write request for SD memory from the SD bus terminal and write the input data to the input buffer memory; and the SD bus terminal In response to a data read request for SD memory from the output memory, the output data is read from the output buffer memory and transferred to the SD bus terminal, and in response to a data write request from the wireless transceiver The output from the wireless transceiver to the output buffer memory An output data writing function that permits data writing and an input data reading function that permits transfer of the input data from the input buffer memory to the wireless transceiver in response to a data read request from the wireless transceiver And further comprising.

  The wireless transmission / reception unit communicates with a sensor node in accordance with a low-power short-range wireless communication standard, and transmits input data including command data including measurement conditions to the sensor node; and an output for receiving measurement data from the sensor node. And a data receiving means.

According to another aspect of the present invention, there is provided an SD memory type communication including a sensor node that performs communication according to a low-power short-range wireless communication standard, a host device including an SD bus terminal, a control unit, a wireless transmission / reception unit, and an SD bus terminal. An SD memory type communication system for transferring data between the sensor node and the host device via the SD memory type communication device, wherein the control unit includes the SD bus terminal and an input buffer. Memory control means for performing data transfer between the memory and the output buffer memory, and responding to the signal from the SD bus terminal, causing the input buffer memory to respond as a pseudo SD memory, the input buffer memory, and the output Computation processing means for performing data transfer between a buffer memory and the wireless transmission / reception unit, the memory control means, A pseudo FAT (File Allocation Table) creation function for creating a file format required by the storage device in the SD memory type communication device, and a response to a data write request for SD memory from the SD bus terminal In response to an input data write function for reading input data from the SD bus terminal and writing it to the input buffer memory, and in response to an SD memory data read request from the SD bus terminal, output data is read from the output buffer memory. Output data read function for reading and transferring to the SD bus terminal, and output data permitting writing of the output data from the arithmetic processing means to the output buffer memory in response to a data write request from the arithmetic processing means Write function and data read request from the arithmetic processing means In response, and configured to include a input data read function that allows the transfer of said input data to said processing means from said input buffer memory.

  According to the present invention, it is possible to transfer data by performing input / output control as if it were a memory using an SD specification interface used for controlling an SD card memory.

Hereinafter, the present invention will be described in detail with reference to the drawings.
(First embodiment)

  FIG. 1 is a block diagram of an SD memory communication system according to an embodiment of the present invention. This communication system includes an SD memory type communication device 10, a portable information terminal 20, and a sensor node 30.

  The portable information terminal 20 includes an SD bus slot 23, an application program 21, and an SD memory driver IC 22. The application program 21 uses information on an SD card such as an SD memory inserted into the SD bus slot 23. Is configured to execute the software. The portable information terminal 20 in the present embodiment interfaces with the SD memory type communication device 10 via the SD bus slot 23. This interface control is based on the specification of the SD memory type that controls the SD memory.

The SD memory type communication device 10 includes a control unit 11, an SD bus terminal 12, and a wireless transmission / reception unit 13. The SD memory type communication device 10 is attached to the SD bus slot 23 of the portable information terminal 20 via its own SD bus terminal 12. Communication with the sensor node 30 is performed via the wireless transmission / reception unit 13.
The sensor node 30 includes a wireless transmission / reception unit 31, a control unit 32, and a sensor unit 33, and data of measured values such as temperature, pressure, acceleration, and vibration collected by the sensor unit 33 are transmitted via the SD memory type communication device 10. The information is periodically sent to the portable information terminal 20.

  The wireless transmission / reception unit 13 of the SD memory type communication device 10 and the wireless transmission / reception unit 31 of the sensor node 30 perform a wireless PAN (Private Area Network) according to a low-power short-range wireless communication standard such as ZigBee (IEEE802.15.4). Configure and communicate. The control unit 32 of the sensor node 30 automatically connects to this PAN when the power is turned on or close to the wireless transmission / reception unit 13 of the SD memory type communication device 10, and measured values such as temperature, pressure, acceleration, and vibration. Is transmitted from the wireless transmission / reception unit 31.

FIG. 2 is a block diagram showing a detailed internal structure of the SD memory type communication device 10 of the present embodiment.
The wireless transmission / reception unit 13 includes an input data transmission unit 131 that transmits command data including measurement conditions to the sensor node 30, and an output data reception unit 132 that receives measurement data from the sensor node 30.
The control unit 11 of the SD memory type communication device 10 includes an arithmetic processing unit 111, a buffer memory 112, a memory control unit 113, an SD connector 114a, a CPUIO connector 114b, and a CPU memory connector 114c.

The arithmetic processing unit 111 includes a CPU 111 a, an SRAM 111 b having a function of temporarily storing data from the wireless transmission / reception unit 13, and a FLASH ROM 111 c that stores a program and the like, and wirelessly receives command data from the memory control unit 113. An input data output function 111d for sending to the transmission / reception unit 13 and an output data input function 111e for taking measurement data from the wireless transmission / reception unit 13 and inputting them to the output buffer memories 112c and 112d are provided.
The buffer memory 112 includes input buffer memories 112a and 112b that store data from the SD bus terminal 12, and an output buffer memory that stores data output from the wireless transmission / reception unit 13 via the output data input function 111e of the arithmetic processing unit 111. 112c and 112d, each of which has a double buffer structure.

  The memory control unit 113 reads the data through the SD bus terminal 12 in response to a data write request from the SD bus terminal 12 to the SD memory, and writes the data into the input buffer memories 112a and 112b. In response to a data read request to the SD memory from the SD bus terminal 12, the writing of the writing output buffer memory 112c or 112d to another output buffer memory 112d or 112c is switched to the original buffer memory 112c or 112d. In response to the data write request from the arithmetic processing means 111 and the output data read function 113b for reading data from the SD bus terminal 12 and transferring the data to the SD bus terminal 12, the data is written from the arithmetic processing means 111 to the output buffer memories 112c and 112d. Allowed output data In response to a data read request from the data write function 113c and the processing means 111, the input buffer memory 112a or 112b being written is switched to another buffer memory 112b or 112a, and the original buffer memory 112a or 112b is switched. And an input data read function 113 d that permits data transfer from the computer to the arithmetic processing means 111.

メモリ制御手段１１３の入力データ書き込み機能１１３ａによって、ＳＤコネクタ１１４ａを制御して、ＳＤバス端子１２からの表１に示すＣＭＤ（コマンド）信号（２ピン）を解析しながら、コマンドデータの転送を行う。更に、入力データ書き込み機能１１３ａによって、ＳＤバス端子１２からの表１に示すＤＡＴ（０：３）信号（１，７，８，９ピン）を、一旦、入力バッファメモリ１１２ａに書き込み、入力データ読み出し機能１１３ｄによって、無線送受信部１３からのデータ読み出し要求に応答して、書き込みをしていたメモリを入力バッファメモリ１１２ｂに切り替えて、入力バッファメモリ１１２ａから演算処理手段１１１へこのデータの転送を許可する。このとき、演算処理手段１１１による入力データの読み出しは、入力データ出力機能１１１ｄにより演算処理手段１１１のメモリバスを用いて高速に行われる。 Table 1 shows the SD card pin arrangement table. Pin 1 is card detection / data I / O, Pin 2 is a pin for sending and receiving command signals, Pin 3 is a ground line, Pin 4 is a power supply, and Pin 5 is a clock. Yes, the 6th pin is the ground, and the 7th, 8th and 9th pins are the data I / O.

The input data write function 113a of the memory control means 113 controls the SD connector 114a to transfer command data while analyzing the CMD (command) signal (pin 2) shown in Table 1 from the SD bus terminal 12. . Further, the input data write function 113a once writes the DAT (0: 3) signal (1, 7, 8, 9 pins) shown in Table 1 from the SD bus terminal 12 to the input buffer memory 112a and reads the input data. In response to the data read request from the wireless transmission / reception unit 13, the function 113d switches the memory that has been written to the input buffer memory 112b, and permits the transfer of this data from the input buffer memory 112a to the arithmetic processing unit 111. . At this time, the input data is read by the arithmetic processing unit 111 at high speed using the memory bus of the arithmetic processing unit 111 by the input data output function 111d.

Furthermore, using the output data write function 113c, in response to a data write request from the arithmetic processing unit 111, writing of collected data from the sensor node 30 to the output buffer memory 112c via the wireless transmission / reception unit 13 is permitted. To do. Writing of output data by the arithmetic processing unit 111 at this time is performed by using the memory bus of the arithmetic processing unit 111 by the output data input function 111e.
Thereafter, the output data read function 113b is used to switch the written memory to the output buffer memory 112d in response to a periodic data read request from the SD bus terminal 12, and this data is transferred from the output buffer memory 112c. Read and transfer to the SD bus terminal 12. At this time, reading of output data from the SD bus terminal 12 is performed by the SD memory driver 22 of the portable information terminal 20 by polling control.

FIG. 3 shows a flowchart of a data transfer program executed by the memory control unit 113 of the control unit 11 of this embodiment.
When the process starts when the power is turned on, the memory control unit 113 first creates a pseudo FAT (File Allocation Table) by the pseudo FAT creation function 113e (step S101). The creation of the pseudo FAT means that the SD memory type communication device 10 has a file format requested by a host device such as a portable information terminal in order to use the device as a pseudo SD memory. Subsequently, the entire apparatus is initialized by the initialization function 113f (step S102).

Here, the memory control means 113 determines whether there is a data write request from the sensor node 30 (step S103). If there is a request (step S103: Yes), writing is permitted and data is written from the arithmetic processing means 111 to the output buffer memory 112c (step S104). Writing is performed using the memory bus of the CPU 111a of the arithmetic processing means 111 by the output data input function 111e. Since the output buffer memories 112c and 112d are duplicated, even if the reading to the SD bus terminal 12 is performed in one buffer memory 112c, the writing is performed in the output buffer memory 112d on the other side. There is no particular need to adjust the timing of the.
If there is no data write request from the arithmetic processing unit 111 (step S103: No), the process proceeds to step S105.

Subsequently, the memory control unit 113 determines whether or not there is a data read request from the SD bus terminal 12 (step S105). When there is a request (step S105: Yes), the duplexed output buffer memories 112c and 112d are switched from the previously read buffer memory 112c to the output buffer memory 112d on which data has been newly written ( In step S106, the data is read from the output buffer memory 112c and sent to the SD bus terminal 12 (step S107).
When there is no data read request from the SD bus terminal 12 (step S105: No), the process proceeds to step S108.
Further, it is determined whether or not there is a data write request from the SD bus terminal 12 (step S108). If there is a request (step S108: Yes), writing from the SD bus terminal 12 is permitted and data is written to the input buffer memory 112a (step S109).
When there is no data write request from the SD bus terminal 12 (step S108: No), the process proceeds to step S110.

Furthermore, the memory control unit 113 determines whether there is a data read request from the sensor node 30 (step S110). When there is a request (step S110: Yes), the duplexed input buffer memories 112a and 112b are switched from the previously read buffer memory 112a to the input buffer memory 112b on which data has been newly written ( In step S111, the data is read from the input buffer memory 112b and sent to the arithmetic processing means 111 (step S112). This reading is performed at high speed using the memory bus of the CPU 111a of the arithmetic processing means 111 by the input data output function 111d. The input buffer memories 112a and 112b are also duplicated, and even if writing from the SD bus terminal 12 is performed in one input buffer memory 112a, writing in the input buffer memory is switched to the input buffer memory 112b, Since the data is read from the input buffer memory 112a, there is no need to particularly adjust the read timing.
If there is no data read request from the sensor node 30 (step S110: No), the process proceeds to step S103.

  By repeating this processing from step S103 to step S112, a command from a host device such as the portable information terminal 20 is transmitted to the sensor node 30 via the SD memory type communication device 10 and obtained at the sensor node 30. Data of measurement values is continuously collected by the host device via the SD memory type communication device 10.

(Comparative example)
FIG. 4 shows a block diagram of an SDIO communication system including a communication device using an SDIO card as a comparative example with the present embodiment. This communication system includes an SDIO communication device 40, a portable information terminal 50, and a sensor node 30.

  The portable information terminal 50 includes an SD bus slot 53, an application program 51, and an SDIO driver IC 52, and executes the application program 51 using an SDIO card inserted into the SD bus slot 53, and has various functions. Is configured to run. In this example, data detected by the sensor node 30 is collected through an interface with the SDIO communication device 40.

The SDIO communication device 40 includes a control unit 41, an SD bus terminal 42, and a wireless transmission / reception unit 43. The SDIO communication device 40 is attached to the SD bus slot 53 of the portable information terminal 50 via its own SD bus terminal 42, and is wireless. Communication with the sensor node 30 is performed via the transmission / reception unit 43.
The sensor node 30 includes a wireless transmission / reception unit 31, a control unit 32, and a sensor unit 33. The sensor node 30 converts data of measured values such as temperature, pressure, acceleration, and vibration collected by the sensor unit 33 into data, and the data is transmitted wirelessly. The data is transmitted from the transmission / reception unit 31, sent to the SDIO communication device 40, and transmitted to the portable information terminal 50 via the SDIO communication device 40. The control unit 32 performs an interface between the wireless transmission / reception unit 31 and the sensor unit 33.

Table 2 shows the pin layout of the SDIO card. Pin 1 is card detection / data I / O, Pin 2 is a pin for sending and receiving command signals, Pin 3 is a ground line, Pin 4 is a power supply, and Pin 5 is a clock. Yes, the 6th pin is the ground, and the 7th, 8th and 9th pins are the data I / O. Pin 8 is also used for interrupt control.

FIG. 5 shows an internal configuration of the SDIO type communication device 40.
The control unit 41 includes an arithmetic processing unit 411, an SDIO control unit 413, an SD connector 414a, and a CPU connector 414b. The arithmetic processing unit 411 includes a CPU 411a, an SRAM 411b, and a FLASH ROM 411c.

The SDIO control means 413 controls the SD connector 414a to transfer command / response data while analyzing the CMD signal from the SD bus terminal 42. In response to the interrupt signal, the data signal DAT (0: 3) from the SD bus terminal 42 is transferred to the arithmetic processing means 411, and the data signal DAT (0: 3) from the arithmetic processing means 411 is transferred to the SD bus terminal 42.
The arithmetic processing unit 411 includes an SRAM 411b and a FLASH ROM 411c on a memory bus, and in addition to an interface with the SDIO control unit 413, also performs an interface with the wireless transmission / reception unit 43 and performs a communication with the sensor node 30.

FIG. 6 shows a flowchart of a data transfer program executed by the SDIO control means 413 of the control unit 41 of this comparative example.
First, when the processing is started by turning on the power, the entire SDIO communication device 40 is initialized (step S201). Subsequently, it is determined whether or not there is a write request from the arithmetic processing means 411 (step S202). If there is a write request (step S202: Yes), an interrupt is generated on the SD bus (step S203). A predetermined 1-bit DAT (1) of the data signals DAT (0: 3) is used as the interrupt generation signal.
If there is no write request from the arithmetic processing means 411 (step S202: No), the process proceeds to step S204.

Next, when there is a read request from the SD bus terminal 42 (step S204: Yes), the data is transferred from the arithmetic processing means 411 to the SD bus terminal 42 (step S205).
If there is no read request from the SD bus terminal 42 (step S204: No), the process proceeds to step S206.
Next, when there is a write request from the SD bus terminal 42 (step S206: Yes), an interrupt is generated in the arithmetic processing means 411 (step S207). As an interrupt signal, a software interrupt is given to the arithmetic processing means.
When there is no write request from the SD bus terminal 42 (step S206: No), the process proceeds to step S208.
Next, when there is a read request from the arithmetic processing means 411 (step S208: Yes), the data is transferred from the SD bus terminal 42 to the arithmetic processing means 411 (step S209).
Then, the process returns to step S202.
When there is no read request from the arithmetic processing unit 411 (step S208: No), the process returns to step S202.
By repeating steps S202 to S209, the command from the portable information terminal 50 is transmitted to the sensor node 30 via the SDIO communication device 40, and the measured value data obtained at the sensor node 30 is transferred to the SDIO communication. The data is continuously collected by the portable information terminal 50 via the device 40 and transferred.

In this comparative example, since interrupt control is used for data transfer, it is necessary to manufacture an SDIO driver IC, and the SDIO driver IC 52 provided in the portable information terminal 50 is also relatively expensive.
In contrast to this, in the present embodiment described above, the SD memory type communication device 10 is used, and the SD memory driver IC 22 of the SD specification used for controlling the memory is used as it is for the driver IC, so that there is a pseudo SD memory. Since data is transferred in this way, it is not necessary to provide an expensive SDIO driver IC in the portable information terminal 20, and it can be configured at low cost. With a portable information terminal that already has an SD memory specification, the SD memory type communication device system 100 can be realized only by creating an inexpensive application program and without changing the driver.

(Modification)
The present invention is not limited to the embodiments described above, and various modifications such as the following are possible.
In the above-described embodiment, the control unit is provided with the arithmetic control unit and the memory control unit, but the wireless transmission / reception unit is provided with a memory that temporarily stores data transmitted from the sensor node 30, thereby It is also possible to perform the interface by the memory control means.
Furthermore, it is possible to make the buffer memory configuration simpler and to reduce the burden on the arithmetic control means and the memory control means by giving a certain periodicity to the write request and read request from the host device. become.
In the embodiment, the input buffer memories 112a and 112b and the output buffer memories 112c and 112d are provided. However, when data is transmitted from the sensor node 30 to one buffer memory, only the output buffer memories 112c and 112d are used. Can be configured.

1 is a block diagram of an SD memory communication system including an SD memory communication device according to an embodiment of the present invention. It is a block diagram which shows the detailed internal structure of the SD memory type communication apparatus of this embodiment. It is a flowchart of the data transfer program which the memory control means of the control part of this embodiment performs. It is a block diagram of the SDIO type | mold communication system containing the communication apparatus using the SDIO card as a comparative example of this embodiment. It is a block diagram which shows the detailed internal structure of the SDIO type | mold communication apparatus as a comparative example. It is a flowchart of the data transfer program which the SDIO control means of the control part of a comparative example performs.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 SD memory type communication apparatus 11 Control part 12 SD bus terminal 13 Wireless transmission / reception part 20 Portable information terminal (host apparatus)
21 Application program 22 SD memory driver IC
23 SD bus slot 30 Sensor node 31 Wireless transmission / reception unit 32 Control unit 33 Sensor unit 100 SD memory type communication device system 101 SDIO type communication device system 111 Arithmetic processing means 112 Buffer memory 113 Memory control means

Claims (8)

An SD memory type communication device comprising a control unit, a wireless transmission / reception unit, and an SD bus terminal connected to a host device, and transferring data between the SD bus terminal and the wireless transmission / reception unit,
The control unit performs data transfer between the SD bus terminal and the wireless transmission / reception unit via the first buffer memory and the second buffer memory, and one of the buffers is used when the data transfer is performed. 1. An SD memory type communication apparatus, which performs memory switching control for reading data written in a memory and writing other data in the other buffer memory . An input buffer memory for pre-Symbol transfers the input data to the wireless transceiver from the SD bus terminal, wherein the output buffer memory for transferring the output data to the SD bus terminal from the wireless transceiver, respectively, the first buffer memory and The SD memory type communication device according to claim 1, further comprising the second buffer memory . 3. The SD memory type communication device according to claim 2 , wherein write control to the input buffer memory and read control from the output buffer memory are performed by polling control.   The SD memory type communication device according to any one of claims 1 to 3, wherein the host device is a portable information terminal. The SD memory type communication device includes a control unit, a wireless transmission / reception unit, and an SD bus terminal connected to a host device, and transfers data between the SD bus terminal and the wireless transmission / reception unit via a buffer memory. And
The control unit creates a pseudo FAT (File Allocation Table) so that the SD memory type communication device has a file format required by the host device, and makes the buffer memory respond as a pseudo SD memory. An SD memory type communication device comprising: The buffer memory includes both an input buffer memory that transfers input data from the SD bus terminal to the wireless transceiver, and an output buffer memory that transfers output data from the wireless transceiver to the SD bus terminal,
The memory control means includes
An input data write function for reading the input data from the SD bus terminal and writing it to the input buffer memory in response to a data write request for the SD memory from the SD bus terminal;
An output data read function for reading the output data from the output buffer memory and transferring it to the SD bus terminal in response to an SD memory data read request from the SD bus terminal;
In response to a data write request from the wireless transceiver, an output data write function that permits writing of the output data from the wireless transceiver to the output buffer memory;
In response to a data read request from the wireless transceiver, an input data read function that permits transfer of the input data from the input buffer memory to the wireless transceiver;
The SD memory type communication device according to claim 5 , further comprising: The wireless transceiver communicates with the sensor node according to a low power short-range wireless communication standard,
Input data transmitting means for transmitting command data including measurement conditions to the sensor node;
SD memory communication apparatus according to claim 1 or claim 5, characterized in that an output data receiving means for receiving measurement data from the sensor nodes. A sensor node that performs communication according to a low-power short-range wireless communication standard; a host device that includes an SD bus slot; and an SD memory type communication device that includes a control unit, a wireless transmission / reception unit, and an SD bus terminal. An SD memory communication system for transferring data between the sensor node and the host device via a communication device,
The controller is
Memory that transfers data between the SD bus terminal and an input buffer memory and an output buffer memory, and makes the input buffer memory and the output buffer memory respond as pseudo SD memories to signals from the SD bus terminal Control means, arithmetic processing means for performing data transfer between the input buffer memory and the output buffer memory and the wireless transmission and reception unit,
The memory control means includes
A pseudo FAT creation function for creating a pseudo FAT (File Allocation Table) in order to have the file format required by the host device in the SD memory type communication device;
An input data write function for reading input data from the SD bus terminal and writing it to the input buffer memory in response to a data write request for SD memory from the SD bus terminal;
An output data read function for reading output data from the output buffer memory and transferring it to the SD bus terminal in response to an SD memory data read request from the SD bus terminal;
In response to a data write request from the arithmetic processing means, an output data write function that permits writing of the output data from the arithmetic processing means to the output buffer memory;
An input data read function that permits transfer of the input data from the input buffer memory to the arithmetic processing means in response to a data read request from the arithmetic processing means;
An SD memory type communication system comprising:

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