JPH05241685A - Power supply circuit for incircuit emulator - Google Patents

Abstract

PURPOSE:To confirm the connection of connectors without fail and to secure the safety of power supply by not forming a cyclic path in case an improper connection is in each unit so as to prevent a control signal from being supplied to a relay section. CONSTITUTION:When all units 21-24 comprising an incircuit emulator 10 are properly connected and a bottom cover 32 is placed at the lower part of a lowest-order unit 24, a cyclic path 31 is formed. If the power is applied in this state, a MAP-ON signal is supplied through cables 12 and 14 to the input terminal of a relay section 35 thereby applying the AC voltage to the input terminal of a power supply section 34. In case an improper connection is in any unit or the bottom cover 32 is not mounted, the short-circuited cyclic path 31 will not be formed and the MAP-ON signal will not be supplied to the relay section 35. Thus the power is not applied from a power supply section 34.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply circuit for an in-circuit emulator in which an in-circuit emulator is housed as a single unit for each function in the same case, and these are combined to form a stacked structure.

[0002]

2. Description of the Related Art An in-circuit emulator has a function of monitoring a memory access of a microprocessor, detecting a trigger point or a break point, and stopping the operation of a target microprocessor or stopping a trace. It is used as a development support device.

[0003]

By the way, in recent years, even in-circuit emulators have been required to deal with high-speed processors with high reliability. For this reason, it is necessary to eliminate wiring delay. Therefore, it is common knowledge to arrange the emulation CPU on the tip side as close to the target side as possible. As a result, the interface condition with the target system is dramatically improved, but the timing on the side controlling the emulator becomes strict, so that it becomes necessary to bring the functional unit on the main body side as close as possible to the emulation CPU.

However, in the case where it is realized by the conventional structure, the main body side includes the power supply circuit, so that there is a limit to downsizing, and only truly necessary units can be selectively used. Because it wasn't configured, extra space could get in the way. Furthermore, since the circuit board that constitutes the functional unit is attached to and detached from the main body,
The operability was sometimes impaired.

On the other hand, the inventors of the present invention can easily select a system according to the application, downsize the functional unit so as to correspond to high speed, and improve operability for each function. We have proposed a unitized in-circuit emulator.

However, the circuit board of each functional unit is
Although they are stacked and connected to each other with a connector, if the power is turned on with the connection of each connector being incomplete, not only normal operation can be expected, but also
There is a possibility that problems such as destruction of electronic parts may occur.

Therefore, the present invention is capable of confirming a reliable connection of connectors between units in an in-circuit emulator having a stack structure in which each function is unitized,
An object of the present invention is to provide a power supply circuit for an in-circuit emulator that ensures safety in power supply.

[0008]

In order to achieve the above object, the power supply circuit of the in-circuit emulator of the present invention accommodates a plurality of circuit boards as a unit in a single and individual case, and stacks these cases. By connecting with a connector to control an in-circuit emulator section that constitutes a circuit that circulates all of these units, a power supply section connected to the in-circuit emulator section by a power supply line, and power supply of this power supply section. A power supply unit having a relay unit; and a host computer connected to the relay unit of the power supply unit via a circuit that circulates through the circuit of the in-circuit emulator unit and supplies a control signal to the relay unit. It is a thing.

Further, in this power supply circuit, the unit located at the lowest position of the in-circuit emulator section is provided with a switch which is turned on by mounting a bottom cover in the middle of the circuit.

[0010]

According to the present invention, in the in-circuit emulator section, a circuit is constructed in which the connectors of the respective units are connected to circulate all units, and the relay section of the power supply unit passes through the circuit of the in-circuit emulator section. A circuit that circulates in the host computer is configured, and by supplying a control signal from the host computer to the relay section of the power supply unit, the power of the power supply section is supplied to the in-circuit emulator section. Therefore, if each unit is not connected correctly even at one place, a circuit is not formed,
Since the control signal is not supplied to the relay unit and the power is not supplied to each unit, it is possible to confirm the reliable connection of the connector and ensure the safety of the power supply.

Further, if a switch which is turned on by the bottom cover is provided in the circuit portion of the unit located at the lowest position of the in-circuit emulator section, the exposed terminals of the lowest unit are protected by the bottom cover. The risk of damage or short circuit is prevented.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to an embodiment shown in the drawings. FIG. 2 is a perspective view for explaining the overall configuration of the in-circuit emulator of the embodiment of the present invention, and FIG. 3 is an exploded perspective view of the in-circuit emulator of the embodiment of the present invention.

In these figures, the in-circuit emulator 10 of this embodiment is connected to a host computer 11 by a cable 12, and a power supply unit 13 for supplying power to each unit is connected by a cable 14. The power supply unit 13 has a sufficient power supply capacity even when an optional unit is added in the future, and is formed in a compact shape that can be arranged anywhere. The distance between the power supply unit 13 and the in-circuit emulator 10 is, for example, about 6 mm. Flexible round cable 14 with a diameter of about 1.5M
And is controlled by a signal output when the power of the host computer 11 is turned on, as will be described later in detail. In addition, the in-circuit emulator 10 stores several typical functions required for its implementation in a single and individual case of the same size to form a unit, which is selectively combined and stacked (stack). The structure is organized.

In this embodiment, the fan unit 2 is arranged from the top.
1, a trace unit 22, an execution unit (probe unit) 23, and an emulation memory unit 24. The execution unit 23 is separated into an analyzer bus on the upper side and an emulation memory bus on the lower side, and is connected to the units on the upper side and the lower side, respectively.

The fan unit 21 is equipped with a cooling fan (not shown) therein, and cools all the units when the units are stacked and connected, and the upper surface of the system is provided with a cooling fan. A status LED for confirming the operating state and an outlet for cooling air are provided.

The trace unit 22 is a unit having a function of storing the execution state of the emulation CPU in real time through the common bus of the execution unit 23, and is composed of a control gate array and a memory for storing it in a high function. ing.

The execution unit 23 is a unit for controlling the execution of the CPU, and is the host computer 1.
1. A probe base unit 25 in which an interface circuit with an emulator-controlled host card (not shown), a pin status port of the CPU, a control switch port for control signals, an interface circuit with the trace unit 22, etc. And a probe tip portion 26 on which a control circuit such as a control gate array is mounted are connected by a flexible cable 27. A connector (not shown) for connecting the cables 12 and 14 is provided on the end surface of the execution unit 23 on the side opposite to the flexible cable 27.

The emulation memory unit 24
Is a unit for emulating a memory, and is composed of a control circuit such as a memory mapper gate array and a bus swapper gate array, and a memory. This memory is, for example, high-speed SRAM (static RAM).
Is used, and the storage capacity from 256K to a maximum of 4MB can be selected.

On the upper surface and corresponding lower surface of each unit, a connector 28 for electrically connecting the upper and lower units on both sides in the longitudinal direction, a detaching mechanism 29 for locking and separating the upper and lower units from each other, and ventilation. There is a mouth and. The connector 28 is, for example, a half-pitch dual-row connector having 160-pole signal pins and power supply terminals, and is a high-speed transmission connector in which a shield measure is provided between the pin rows to prevent interference due to crosstalk. is there.

FIG. 1 is a diagram for explaining the configuration of the power supply circuit of the in-circuit emulator according to the embodiment of the present invention. In addition,
The parts corresponding to those in FIGS. 1 and 2 are designated by the same reference numerals.

As shown in the figure, when the units are properly connected, the MP-ON connected by the connector is connected.
The ground line of the (main power-on) signal circuit forms a circuit 31 that circulates each unit. In a state in which these units are connected, a bottom cover 32 for protecting the exposed terminal portion of the connector is attached to the bottom of the lowest unit (execution unit 23 or emulation memory unit 24). Further, a micro switch 33 is provided in the middle of the circuit 31 of the unit located at the lowest position. When the bottom cover 32 is attached, the micro switch 33 is pushed by the protrusion 32a formed on the bottom cover 32 to be turned on, and the circuit 31 in that portion is short-circuited. There is. That is, in this embodiment, when the fan unit 21, the trace unit 22, the execution unit 23, and the emulation memory unit 24 are sequentially stacked from the top and connected, the execution unit 23 to the trace unit 22 to the fan unit 21 to the trace. The circuit 22 is formed such that the unit 22 to the execution unit 23 to the emulation memory unit 24 to the execution unit 23 are connected in such a manner that the ground line circulates in that order.

The power supply unit 13 is a power supply unit 34 including a switching power supply for converting an AC voltage into a DC voltage.
And a relay section 35 formed of a solid state relay for controlling ON / OFF of the AC input of the power supply section 34. The input terminal of the power supply section 34 is an outlet 36 connected to an AC power supply via the control output terminal of the relay section 35.
The output terminal is connected to the power supply terminal of the execution unit 23 via a power supply line forming a part of the cable 14. The input terminal of the relay section 35 has its negative terminal connected to one line of the circuit 31 via the cable 14 and its positive terminal supplied with the control signal of the host computer 11 via the cables 14 and 12. Connected to the line. The other line of the circuit 31 is connected to the ground line of the host computer 11 via the cable 12. The host computer 11 outputs an MP-ON signal as a control signal when its power is turned on.

According to the power supply circuit having the above-described structure, first, all the units 21, 22, 23, and 24 constituting the in-circuit emulator 10 are correctly connected, and the bottom cover 32 is attached to the bottom of the lowest unit 24. If so, the circuit 31 is formed. When the host computer 11 is powered on in this state, MAP
-ON signal is transmitted via the cables 12 and 14 to the relay section 25.
Is supplied to the input terminal of the relay unit 25, the relay unit 25 operates, the control output terminal is short-circuited, and the AC voltage is applied to the input terminal of the power supply unit 34. As a result, the power supply unit 34 outputs a DC voltage to the output terminal, and this DC voltage is supplied as the power supply voltage for each unit via the cable 14. Therefore,
If any unit of the in-circuit emulator 10 that constitutes the stack is not properly connected even at one place, or if the bottom cover 24 is not attached to the bottom of the emulation memory unit 24 located at the lowest position. Since the short-circuited circuit 31 is not formed, the MAP-ON signal is not supplied to the relay unit 25 and the power supply unit 34 does not supply power to each unit.
That is, the reliable connection of the connector between the units can be confirmed, and the safety in the power supply to the units is ensured. Similarly, the bottom cover 3 is attached to the lowest unit.
Since the power is not supplied even when 2 is not attached, it is possible to prevent the risk of damage to the terminals of the connector exposed at the lower part of the lowest unit or a short circuit. Further, in the present embodiment, the circuit 31 is not formed unless the fan unit 21 located at the top is mounted, so that the power supply is not supplied to each unit, so that the safety design is performed.

Although the emulation memory unit 24 is described as the lowest unit in the above embodiment, the present invention is not limited to this. For example, the lowest unit is used as the execution unit 23 without using the emulation memory unit 24. In this case, the bottom cover 32 may be attached to the lower part of the execution unit 23. That is, in the lowest unit, a micro switch 33 is provided in a part of the circuit, and the bottom cover 32 is provided in the bottom.
May be configured to be attached.

[0025]

As described above, according to the present invention, each unit is connected by a connector to form a circuit that circulates all units, and a circuit from the relay section of the power supply unit to the in-circuit emulator section is formed. Then, a circuit for circulating to the host computer is configured, and the control signal is supplied from the host computer to the relay section of the power supply unit and the power supply voltage of the power supply section is supplied to the in-circuit emulator section. If the connection is not correct even at the location, the circuit will not be formed, the control signal will not be supplied to the relay section, and the power will not be supplied to each unit, so you can confirm the reliable connection of the connector and the safety of the power supply. Has the effect of being secured. Also, if a switch that is turned on by the bottom cover is provided in the circuit part of the unit located at the bottom of the in-circuit emulator section, the exposed terminals of the bottom unit are protected by the bottom cover, and damage or damage may occur. The risk of short circuit is prevented.

[Brief description of drawings]

FIG. 1 is a diagram illustrating a configuration of a power supply circuit of an in-circuit emulator according to an embodiment of the present invention.

FIG. 2 is a perspective view illustrating the overall configuration of the in-circuit emulator according to the embodiment of the present invention.

FIG. 3 is an exploded perspective view of the in-circuit emulator according to the embodiment of the present invention.

[Explanation of symbols]

 10 In-Circuit Emulator 21 Fan Unit 22 Trace Unit 23 Execution Unit (Probe Unit) 24 Emulation Memory Unit 25 Probe Base Unit 26 Probe Tip 27 Flexible Cable 28 Connector 29 Attachment / Detachment Mechanism 31 Circulation Circuit 32 Bottom Cover 32a Projection 33 Micro Switch 34 Power supply unit 35 Relay unit 36 Outlet

Front page continuation (72) Hiromi Asama Inventor Hiromi 6-2 Minamikurokawa, Aso-ku, Kawasaki-shi, Kanagawa Sofia Systems Microcomputer City Office

Claims (2)

[Claims] 1. An in-circuit emulator section that forms a circuit that circulates all of these units by accommodating a plurality of circuit boards as a unit in a single and individual case and stacking these cases and connecting them with a connector. A power supply unit having a power supply unit connected to the in-circuit emulator unit by a power supply line and a relay unit controlling the power supply of the power supply unit; and a circuit from the relay unit of the power supply unit to the in-circuit emulator unit. A power supply circuit for an in-circuit emulator, comprising: a host computer that is connected by a cable that forms a circuit that circulates through and that supplies a control signal to the relay unit. 2. The power supply for the in-circuit emulator according to claim 1, wherein the unit located at the bottom of the in-circuit emulator section is provided with a switch that is turned on by mounting a bottom cover in the middle of the circuit. circuit