JPS58195921A - Data transferring system - Google Patents

Abstract

PURPOSE:To easily change a system formed by plural apparatuses, by assigning a prescribed code to each of plural apparatuses, and discriminating a code in a data existing in a bi-directional data bus of each apparatus. CONSTITUTION:When a data D1 corresponding to a key pressing state in a keyboard 1 is sent out from a master controller 2, the master controller 2 can recognized that the data D1 is transferred to a deck controller 7, by a send-out data D2 showing ACK (acknowledge) from the deck controller 7 which can be operated as a talker only when an apparatus code is sent out. When a data D3 is sent out, if the master controller 2 can be operated as a talker by coincidence of the apparatus code which is sent out and the final apparatus code stored in advance, in this state, a data D4 obtained by adding an apparatus code again is sent out from the master controller 2.

Description

[Detailed description of the invention] The present invention relates to a data transfer method between multiple devices.

Figure 1g1 shows an audio system formed by a plurality of devices that transfer data using a conventional data transfer method. 1st
In the figure, reference numeral 1 denotes a keyboard including keys for instructing the tuning operation of the tuner, keys for instructing the operating mode of the de-tsuki, and the like. A signal corresponding to the key depression state on the keyboard l is supplied to the master controller 2. The master controller 2 sends data corresponding to the key suppression state to the bidirectional data bus 3 according to the signal supplied from the keyboard 1, and also outputs one or both of the tuner controller selection signal α and the deck controller selection signal. Output.

When the master controller 2 outputs the selection signal α, the tuner controller 4 latches the data on the data bus based on the selection signal α. Thereafter, the command included in the data launched into the tuner controller 4 is decoded to obtain, for example, an automatic channel selection operation command. Then, the tuner controller 4, for example, controls the PL in the tuner 5.
By changing the frequency division ratio of the frequency divider of the L (phase-locked loop) circuit, the tuning frequency is changed until the electric field strength becomes strong again, and automatic tuning operation is performed. When this automatic tuning operation is completed, the tuner controller 4 detects the tuning frequency from the frequency division ratio of the frequency divider of the PLL circuit in the tuner 5, and then transfers data corresponding to this tuning frequency to the master controller 2. Then, a tuner data transmission request signal C to the data bus is supplied to the master controller 2. Then, the master controller 2 supplies the selection signal to the af tuner controller 4 again. The tuner controller 4 sends data corresponding to the tuning frequency to the data bus 3 in response to the selection signal α. Master controller 2 is
After the time required for data to be sent from the tuner controller 4 to the data bus 3 after sending the selection signal a has elapsed, the data on the data bus, that is, the data corresponding to the tuning frequency, is launched. At the same time, the supply of the master controller 2Fi selection signal α to the tuner controller 4 is stopped, and the display element for displaying the tuned frequency, which is composed of a 7-segment type light-purifying diode for displaying numbers in the display device 6, is activated in accordance with the latched data. Drive.

On the other hand, when the master controller 2 outputs the selection signal S, the deck controller 7 latches the data on the data bus at the time when the selection signal S starts outputting. When the deck controller 5 latches data on the data bus, it decodes the command included in this data to obtain, for example, a play operation command. Then, the deck controller 7 outputs a drive command signal to a drive circuit that drives, for example, the tape transport motor and head moving plunger magnet in the deck 8. Then, when a play operation begins on the deck 8, the deck controller 7 sends a deck data sending request signal d to the master controller 2 requesting data sending to the data bus in order to transfer data representing the tape running direction etc. to the master controller 2. supply

Then, the master controller 2 supplies a selection signal to the deck controller 7. deck controller 7
Then, data representing the tape running direction, etc. is sent by the selection signal. , is sent to bus 3. The master controller 2 latches the data on the data bus 3, that is, the data representing the tape running direction, etc., after the time required for the data to be sent from the deck controller 7 to the data bus 3 after sending the selection signal S has elapsed. . At the same time,
The master controller 2 stops supplying the selection signal to the deck controller 7 and drives the display element for indicating the tape running direction, which is made of a light emitting diode or the like in the display device, in accordance with the false data. Conventional data transfer systems require data transfer control signals such as selection signals a+b and request signals c and d. For this reason, the tuner controller 4
In addition to the deck controller 7, in order to connect a controller that controls other devices to the data bus 3 and transfer data with the master controller 2, a new signal line for data transfer control signals is required. As this becomes necessary, it becomes necessary to add a new data transfer control signal processing function to the master controller 2, making it difficult to make changes such as expansion or reduction of the system.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a data transfer method that facilitates modification of a system formed by a plurality of devices that transfer data via a data bus.

In the data transfer method according to the present invention, a predetermined code is assigned to each of a plurality of devices, and each device is configured to determine the code in the data present on the bidirectional data bus and send the data at a predetermined timing. It is characterized by the fact that

The present invention will be explained below with reference to FIGS. 2 and 3.

In FIG. 2, between the keyboard 1 and the master controller 2, between the master controller 2 and the display device 6, between the tuner controller 4 and the tuner 5, and between the deck controller 7 and the deck 8, Data is exchanged in the same way as in FIG.

However, in this example, the master controller 2 stores in advance the code lO'' corresponding to the numerical value "2", which is the same number as the number of controllers connected to the data bus 3 other than the master controller 2, and the key suppression state on the keyboard l. For example, "00" is added as a preset equipment code to the data corresponding to the data, and the obtained data is sent to the data bus 3.
For example, "O1" is added as a preset device code to the data indicating the presence or absence of ACK (affirmative response) to the data sent from the master controller 2 or data indicating the presence or absence of display data indicating the tape running direction, etc. If the device code added to the data sent from another controller on the latched data bus after obtaining the transfer data is "00", the data is sent from the state of the listener which only receives data. It becomes possible to operate as a talker and sends the transfer data to the data bus 3. Further, if the deck controller 7 has display data indicating the tape running direction, etc., this display □/indication data is sent out subsequent to sending out the data indicating the presence or absence of display data. Next, tuner controller 4
is the data indicating ACK to the data sent from the master controller 2. fc is the data indicating the presence or absence of display data indicating the tuning frequency etc., and a preset device code such as "10" is added to the data to be transferred. If the device code added to the data sent from another controller on the data bus that was latched after the
1" and the data sent from other controllers indicates that there is no data for display, the state changes from the listener state to a state where it can operate as a talker and sends the transfer data to the data bus 3. When the data sent from the controller indicates that there is data for display, the tuner controller 4 sends the transfer data to the data bus 3 when the sending of the data for display from another controller is completed. , this tuner controller 4; similar to the deck controller 7, if there is display data indicating the tuning frequency, etc., the tuner controller 4 transmits this display data after transmitting the data indicating the presence or absence of the display data. Transfer data sequentially sent to the data node 3 in an audio system such as the one shown below is shown in chronological order in FIG. 3.As shown in FIG.
When the 8-pin data D1, which is obtained by adding the device code 00'' to the data ``000001'', which is made up of 6 bits and includes a command for commanding the operating mode of the deck, corresponding to the state of key suppression on the keyboard l, is sent. The deck controller 7, which can operate as a talker only when the device code "00" is sent out, sends data indicating ACK f, for example, the second bit counted from the least significant bit assigned as the ACK bit, If "l". The 8-bit data D2 obtained by adding the device code 01''i to the 6-bit data that is ignored is then sent out. This data D2 allows the master controller 2 to recognize that the data D1 has been transferred to the deck controller 7. Next, the tuner controller 4, which can operate as a talker only when the device code 01" is sent out, generates 6-bit data "'ooooooo" which does not mean anything.
The data 1) 3 obtained by adding the device code 19'' to the 1) is sent.Where the device code 10'' sent by the master controller 2 matches the final device code 10 written in advance. If it is enabled to operate as a talker, the master controller 2 will send out data such as data D4, which is obtained by adding the device code "00" again.

The above describes the transfer data sent to the data bus 3 when data is transferred from the master controller 2 to another controller. Next, the transfer data when transferring data from another controller to the master controller 2 (Df-1) will be explained. .For example, Detsuki Controller 7
When the deck controller 7 transfers display data to the master controller 2, the deck controller 7 transfers data for display to the master controller 2.
When the device is ready to operate as a talker with the device code 00''' sent out, the device code is data indicating that there is data for display, for example, 6-bit data obtained by setting the least significant bit to "1". Data D obtained by adding "01" is sent out from the deck controller 7. Then, in addition to this data D, for example, 80 bits of display data D is sent out from the deck controller 7. Then, in the master controller 2, depending on the state of the bit node indicating the presence or absence of display data in the data D5, the data D (80 bits of data is recognized as display data and latched, and then the display device 6 At the same time, the timing at which the tuner controller 4 operates as a talker is delayed by the device code "01" sent from the deck controller 7, and the device code 10" is added after the data D6 has been sent. Obtained data 1
) 7 is output from the tuner controller 4.

As described above, according to the present invention, data transfer can be performed without relying on data transfer control signals such as selection signals a and b and request signals c and d, so that the number of controllers that tilt the equipment can be reduced. Even if there is a Kf change, the master controller 2
There is no need to change the number of signal lines connected to the input/output terminals of the controller, and if the master controller 2 is formed using a microcomputer, the number of controllers can be changed only by changing the microcomputer program. This makes it easier to make changes such as expansion or reduction of the system, debugging, etc., and to efficiently develop systems such as audio systems.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an audio system formed by a plurality of devices that transfer data using a conventional data transfer method, and FIG. 2 is a block diagram showing an audio system formed by a plurality of devices that transfer data using a data transfer method according to the present invention. FIG. 3 is a block diagram illustrating the acoustic system in which the system is installed, and FIG. 3 is a diagram chronologically showing the transfer data sent to the data bus in the system of FIG. ... Master controller 3 ... Data bus 4 ... Tuner controller 5 ... Team 6 ... Display device 7 ...
Detsuki Controller 8...Detsuki Applicant Pioneer Co., Ltd. Agent Patent Attorney Motohiko Fujimura L3 Figure 1 Page 1 continuation 0 Inventor Aoyagibabe 25-1 Yamada Nishimachi, Kawagoe City Pioneer Co., Ltd. Kawagoe Factory

Claims (1)

[Claims] A method of data transfer between multiple devices via a bidirectional data bus, in which a predetermined code is assigned to each device, and each device transfers data existing on the bidirectional data bus. A data transfer method characterized in that the code inside is determined and data including the code assigned to itself is transmitted at a predetermined timing.