JPS62271036A - Interface controller - Google Patents

Abstract

PURPOSE:To surely diagnose an interface control part used in a normal working mode by supplying a false interface input signal to said interface control part and at the same time setting freely the timing of said interface input signal. CONSTITUTION:When an action mode of an interface control part 1 is set to a mode setting register 2, the memory range of an ROM 3 is limited in response to said action mode. When the signal CON received from the part 1 is turned on, the false signal RS-CON is delivered after a desired delay set by a delay means for the memory 3 and latch circuits 4 and 5. This false signal is applied to the part 1 via a selection circuit 6. The signal RS-CON is held for a prescribed time by the delay means for circuits 4 and 5. While the signal CON is turned off by the signal RS-CON. Then the signal RS-CON is turned off by a delay means with desired delay after the signal CON is turned off.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a means for diagnosing an interface of a channel device to which a peripheral device is connected.

〔overview〕

The present invention provides a means for diagnosing an interface section of a channel device, in which a pseudo interface input signal is input to an interface control section used in normal operation, and the timing of this input signal is freely set. This allows the control unit to be reliably diagnosed.

[Conventional technology]

Conventionally, diagnosis of this type of interface is performed by providing a control circuit in the interface control unit for each of the normal operation and diagnostic operation for each interface control signal, or
Alternatively, the output interface control signal is artificially associated with the input interface control signal, and this signal is looped back externally.

[Problem that the invention seeks to solve]

Among these conventional interface diagnostic methods, the method in which circuits are provided for each of the normal operation signal and the diagnostic operation signal increases the amount of hardware when there are many operation modes, and it is difficult to configure the circuit for the diagnostic operation signal. Since a separate control section is provided,
There is a drawback that it is not possible to completely diagnose the interface control unit in normal operation.

Furthermore, although the method of folding back the output interface signal to the input interface signal does not require the installation of a new circuit for diagnosis, it is often difficult to properly correspond the output interface signal to the input interface signal, and the timing is fixed. There are some drawbacks.

The present invention aims to eliminate such drawbacks and to provide an interface control device that can reliably diagnose its own device without increasing the amount of hardware.

[Means for solving problems]

The present invention provides an interface control device that outputs a second control signal to an interface interposed between a channel device and a peripheral device based on a first control signal arriving from the peripheral device, which sets an operation mode of the interface. a setting means (2) for reading out a control signal that simulates one second control signal stored in advance by an address signal related to the second control signal, or relating to a control signal that simulates one second control signal; storage means (3) for reading out another second control signal stored in advance according to the address signal; and delay means (3) for giving a desired delay to the control signal read from the storage means based on the second control signal.
4, 5) and selection means (6) which selects the output of this delay means and supplies it to the own device when the operation mode is the diagnostic mode.
It is characterized by having the following.

[Effect]

When the diagnostic mode is set in the setting means, the memory range is limited according to this mode. When the CON signal is turned on from the interface control section, a pseudo signal of the R3-C0N signal is output after a desired delay by the storage means and the delay means, and is given to the interface control device via the selection means. This pseudo R
This pseudo R3-C0N while the 3-C0N signal is retained.
The CON signal is turned off. Also pseudo R5-C0
The N signal is turned off by a delay means with a desired delay after the CON signal is turned off. A similar operation is performed for the input/output control signals of the interface controller.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS A device according to an embodiment of the present invention will be explained below based on the drawings.

FIG. 1 is a block configuration diagram showing the configuration of an apparatus according to an embodiment of the present invention. FIG. 2 is a sequence diagram showing the interface sequence used in this embodiment.

As shown in FIG. 1, this embodiment device includes an interface control section l that controls interface signals during normal operation.
, a mode setting register 2 that sets the mode of the interface, and a read-only memory 3 that outputs a pseudo interface signal using the input/output signals of the interface as an address.
, latch circuits 4 and 5 that hold the output of the read-only memory 3, and a selection circuit 6 that switches between the output signal of the latch circuit 4 and a human interface signal from a peripheral device. Here, the launch circuit 5 enters the lower address of the read-only memory 3 and is used to control play from a change in the interface output signal to a change in the input signal of the interface. Also, signals CON and DC-DTA on the interface indicate output interface signals, and signals R3-C0N, DA-DTA, DTA-ENA and REQLIEST indicate input interface signals.

Next, the operation of this embodiment device will be explained with reference to FIGS. 1 and 2. When the operating mode and diagnostic mode of the interface are set according to the type of diagnosis and the type of command in the ink interface control unit l, the continuous output dedicated memory 3 stores the memory range (, Mx
xxxxxxD). Here, M indicates the number of bits depending on the type of mode, and X becomes 1 when the interface signal input to the read-only memory 3 is on, and becomes O when it is off. Further, D indicates a play value between interface signals, and is set to the number of bits according to the maximum play value. When the CON signal from the interface control unit 1 turns on, the address of the continuous output memory 3 becomes Mloo.
It becomes OOOD and after playing (value of D) x (clock period) (i.e. address is decremented by 1 every clock)
At the address where the D section becomes all 0, the output of the continuous output memory 3 corresponding to the R3-C0N signal is turned on. This pseudo R
The 3-C0N signal is supplied through the selection circuit 6 to the interface control 1 and the read-only memory 3 with appropriate play. At this time, the address of the successive memory 3 is Ml
oloooD, but R3-C until the D part becomes all O
The contents of the successive output dedicated memory 3 are set so that the 0N signal output remains on. The interface control unit 1 is R
3-Turn off the CON signal by turning on the C0N signal. The address of read-only memory 3 is MOOlooOD,
By setting the D portion to an appropriate play value, it is possible to turn off the R5-C0N signal with an appropriate play from the CON signal OFF. Similarly, the sequence shown in FIG. 2 is executed.

〔Effect of the invention〕

As explained above, the present invention generates a pseudo-interface human input signal based on the signal on the interface, inputs it to the interface control section for normal operation, and also delays the change in the input signal based on the change in the output signal. By making it possible to set freely, there is an effect that diagnosis of the interface control unit used during normal operation can be performed reliably.

[Brief explanation of the drawing]

FIG. 1 is a block configuration diagram showing the configuration of an apparatus according to an embodiment of the present invention. FIG. 2 is a sequence diagram showing the operation of the apparatus according to the embodiment of the present invention. DESCRIPTION OF SYMBOLS 1...Interface control part, 2...Mode setting register, 3...Memory for continuous output, 4.5...Launch circuit, 6...Selection circuit.

Claims (1)

[Claims] (1) In an interface control device that outputs a second control signal to an interface interposed between a channel device and a peripheral device based on a first control signal arriving from the peripheral device, an operation mode of the interface is set. Setting means (
2) Read a control signal that simulates one second control signal stored in advance using an address signal related to a second control signal, or read a control signal that simulates one second control signal stored in advance using an address signal related to a second control signal, or storage means (3) for reading out another stored second control signal; delay means (4, 5) for giving a desired delay to the control signal read from the storage means based on the second control signal; An interface control device comprising: selection means (6) for selecting the output of the delay means and providing it to the device itself when the operation mode is a diagnostic mode.