JPH02285452A - Control system for data transfer bus - Google Patents

Abstract

PURPOSE:To attain the quick transfer of the highly urgent information even in a busy state of a data transfer bus or a reception data buffer of a data transmission/reception device set at the reception side by using a status transfer bus to attain the urgent transfer of data. CONSTITUTION:An information processor is provided with an urgent data reception buffer memory 10 connected to a status transfer bus 3 and a timer 7 which monitors the time covering the reception of a data transfer request through the start of the actual transfer of data in addition to a conventional reception data buffer memory 9 which can perform an access to a transmission data buffer memory 8 of a data transmission/reception device 5 even via the bus 3. In such a constitution, the highly urgent data can be transferred via the bus 3 and the memory 10 even in a busy state of the memory 9 or a data transfer bus 1. As a result, the highly urgent data is always transferred at a high speed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a data transfer bus control system that transfers data between a plurality of data transmitting and receiving devices using two types of buses.

[Conventional technology]

FIG. 4 is a configuration diagram showing a conventional information processing apparatus disclosed in, for example, Japanese Patent Application Laid-Open No. 83-90240. In FIG. 2, (1) is a data transfer bus, (2) is a data transfer bus conflict arbitration unit, (3) is a status transfer bus, (4) is a status transfer bus contention arbitration unit, (5) is a data transmitting/receiving device,
(6) is a data transmission/reception control unit, (8) is a transmission data buffer, (9) is a reception data buffer, (11) is a data transmission signal line, (13) is a data reception signal line, (15) is a status transmission signal line, (16) is the status reception signal line, (17) is the status transfer bus use request line, (1
g) is a status transfer bus use permission line, (19) is a data transfer bus use request line, and (20> is a data transfer bus use permission line).

Next, the operation will be explained. When a data transmission request occurs in the data transmission/reception device (5), the data transmission/reception control unit (6) writes data to the transmission data buffer (8), turns on the status transfer bus use request line 17), and turns on the status transfer bus request line 17). Make a request for use. The status transfer bus contention arbitration unit (4) is connected to each data transmitting/receiving device (5).
The status transfer bus use permission line (
18) to give permission for use. The data transmission/reception control unit (6) of the data transmission/reception device (5) that has been approved for use sends data transfer request information including the number of bytes of data written to the transmission data buffer (8), the job number of the own device, etc. ,
Status transmission signal line (15), status transfer bus (
3) Transmit to the other party's data transmitting/receiving device (5) via the status receiving signal line (16). When the transmission is completed, the status transfer bus use request line (17) is turned OFF to release the status transfer bus.

Data transmitting/receiving device (5) that received the data transfer request information
The data transmission/reception control unit (6) first determines the state of the reception data buffer (9), and if it is in an empty state, turns on the data transfer bus use request line (19) to request use of the data transfer bus. If the receive data buffer (9) is not empty, it is monitored until it becomes empty. The data transfer bus contention arbitration unit (2) is connected to each data transmitting/receiving device (5).
The data transfer bus use permission line (20) is arbitrated for the data transmission/reception device (5) with the highest priority.
Turn it on to give permission to use it. The data transmission/reception control unit (6) of the data transmission/reception device (5) that has been approved for use transmits and receives data to the other party via the data reception signal line (13), data transfer bus (1), and data transmission signal line (13). Device(
The data in the transmission data buffer (8) of 5) is transferred to the reception data buffer (9). When the transfer for the number of bytes included in the data transfer request information is completed, the data transmission/reception control unit (6) connects the data transfer bus use request line (19
) is turned off to release the data transfer bus (1) and the transfer is completed.

[Problem to be solved by the invention]

Conventional information processing devices are configured as described above, so if the receive data buffer is not empty, or even if the receive data buffer is empty but a data transfer bus cannot be obtained, the data cannot be transferred regardless of the urgency of the data. This invention was made to solve the above-mentioned problems, such as the receiving data buffer not being empty. Another object of the present invention is to provide an information processing device that can transfer highly urgent data using a status transfer bus when a data transfer bus cannot be acquired.

[Means to solve the problem]

The information processing device according to the present invention allows the transmission data buffer memory in the data transmission/reception device to be accessed from the status transfer bus as well as the emergency data reception connected to the status transfer bus in addition to the conventional reception data buffer memory. It is provided with a buffer 1 memory and a timer that monitors the time from receiving a data transfer request until the actual transfer starts.

[Effect]

When the reception data buffer memory or the data transfer bus is busy, the data transmission/reception device according to the present invention transfers data with high urgency using the status transfer bus and the urgent data reception buffer memory.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, (1) is a data transfer bus, (2) is a data transfer bus contention arbitration unit, (3) is a status transfer bus, (
4) is a status transfer bus contention arbitration unit, (5) is a data transmission/reception device, (6) is a data transmission/reception control unit, (7) is a timer, (8) is a transmission data buffer, (9) is a reception data buffer, ( 10) is the emergency data reception buffer (1
1) is the data transmission signal line, (12) is the emergency data transmission signal line, (13) is the data reception signal line, (14) is the emergency data reception signal line, (15) is the status transmission signal line, and (18) is the Status reception signal line, (17) is status transfer bus use request line, (18) is status transfer bus use permission line, (19) is data transfer bus use request line, (20) is data transfer bus use permission line. .

Note that FIG. 2 shows the data transmitting/receiving device (
FIG. 3 is a flowchart showing an example of the process performed by the data transmission/reception control unit (6) at the time of transmission. FIG.

Next, the operation of the embodiment shown in FIG. 1 will be explained.

When a data transmission request occurs in the data transmission/reception device (5), the data transmission/reception control unit (6) writes the transmission data into the transmission data buffer (8) (St) and turns on the status transfer bus use request line (17). A request is made to use the status transfer bus (3) (S2). The status transfer bus contention arbitration unit (4) is connected to each data transmitting/receiving device (5).
The status transfer bus use permission line (1
The data transmission/reception control unit (6) of the data transmission/reception device (5) determines that usage permission has been obtained by turning on the transmission data buffer (8) and granting usage permission (S3).
) The data transfer request information, including the number of bytes of data written to Transmission signal line (15), status transfer bus (3), status reception signal line (16)
(S
4). When the transmission is completed, the data transmission/reception control unit (6)
The status transfer bus use request line (17) is turned OFF to release the status transfer bus (S5).

The data transmitting/receiving device that received the data transfer request information (
In 5), the data transmission/reception control unit (6) first checks the urgency determination flag in the data transfer request information (SIO
). When the urgency determination flag is ON, the data transmission/reception control unit (6) starts a timer (7) that monitors the time until the start of data reception processing (811). Next, the state of the received data buffer (9) is determined (512).

If the received data buffer (9) is in an empty state, the data transfer bus use request line (19) is turned on to request use of the data transfer bus (S13). Receive data buffer (9
) is not free, the timer (7) overflows and it is difficult to determine whether a timeout has occurred.51
4) If no timeout has occurred, continue to determine the status of the receive data buffer (9). When a timeout occurs, the process moves to a data transfer sequence using the status transfer bus (3).

The data transfer bus contention arbitration unit (2) arbitrates requests from each data transmitting/receiving device (5) and turns ON the data transfer bus use permission line (20) to the data transmitting/receiving device (5) with the highest priority. and give permission for use.

The data transmitting/receiving device that requested the use of the data transfer bus (
The data transmission/reception control unit (6) in step 5) determines whether permission to use the data transfer bus has been obtained by monitoring the state of the data transfer bus use permission line (20) (S1
5). When permission is obtained, the data reception signal line (1
3), data transfer bus (1), data transmission signal line (13)
), the data in the transmission data buffer 8) of the other party's data transmission/reception device (5) is transferred to the reception data buffer (9) (S16). When the transfer for the number of bytes included in the data transfer request information is completed, the data transmission/reception control unit (6) turns the data transfer bus use request line (19) off.
FF, release the data transfer bus (1) and transfer (S
L? ). If permission to use the data transfer bus (1) is not obtained, the timer (7) overflows and it is determined whether a timeout has occurred (S1g); if no timeout has occurred, continued use of the data transfer bus is permitted. Monitor the condition of line (20). When a timeout occurs, turn off the data transfer bus use request line (19).
After that (819), the process moves to a data transfer sequence using the status transfer bus (3). The occurrence of a timeout means that the transfer of highly urgent data whose urgency determination flag is ON could not be started even after the timer monitoring time elapsed, and at this time, the data transmission/reception control unit (6 ) determines that the data transfer bus (1) or the receive data buffer (9) is busy and starts an emergency data transfer sequence using the status transfer bus (3). First, the data transmission/reception control unit (6) turns on the status transfer bus use request line (17) to request use of the status transfer bus (3) (820). next,
When it is determined that permission to use the status transfer bus (3) has been obtained by turning on the status transfer bus use permission line (18) (S21), the emergency data reception signal line (14),
Status transfer bus (3), emergency data transmission signal line (1)
2), the data in the transmission data buffer (8) of the other party's data transmission/reception device (5) is transferred to the emergency data reception buffer (1O) (S22). When the transfer for the number of bytes included in the data transfer request information is completed, the data transmission/reception control unit (6) issues a status transfer bus use request Ha'
Turn r'r off and release the status transfer bus (3) (823).

In addition, although the above embodiment describes the case of an information processing device, it may also be an @ line control device equipped with a fitK line processing function for each data transmission/reception function, and as a data transfer path control set, the same effects as in the above embodiment can be achieved. .

〔Effect of the invention〕

As described above, since this FIAK is configured to allow emergency data transfer using the data transmitting/receiving device t- and the status transfer bus, the data transfer bus or the receive data buffer of the receiving data transmitting/receiving device is busy. Even during this period, there is an advantage in that the information processing device can be configured to be able to quickly send highly urgent information.

[Brief explanation of drawings]

Figure 1 is a block diagram showing the configuration of an information processing apparatus according to an embodiment of the present invention, Figure 2- is a flow diagram showing an example of processing at the time of transmission of the data transmission/reception I control section, and Figure 3- is a flow diagram of the data transmission/reception I control section. A flowchart showing an example of processing at the time of reception, and FIG. 4 is a block diagram showing the configuration of a conventional information processing device. In the figure, (1) is a data transfer bus, (2) is a data transfer bus contention arbitration unit, and (3) is a status transfer bus. (4) is a status transfer bus contention arbitration unit, (5) is a data transmission/reception device, (6) is a data transmission/reception control unit, (7) is a timer, (8) is a transmission data buffer, (9) is a reception data buffer, α is an emergency data reception buffer, aυ is a data transmission signal line, υ is an emergency data transmission signal line, a3 is a data reception signal line, and t14 is an emergency data reception signal line. a5 is the status transmission signal line, US is the status reception signal line, aη is the status transfer path use request line, IL
lk is a status transfer bus use permission line, (19 is a data transfer bus use request line, and (2I is a data transfer bus use permission line.) In Figure 2, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] Multiple data transmitting/receiving devices are interconnected using a data transfer bus and a status transfer bus, data is transferred using a transmit data buffer and a receive data buffer connected to the data transfer bus, and data is transferred using a status transfer bus. In an information processing device that transfers the status necessary for data transfer, even if the data transfer bus or the receive data buffer of the receiving data transmitting/receiving device is busy, highly urgent data can be transferred using the status transfer bus. A data transfer bus control method that enables