JPS6379143A - Connecting device for microcomputer - Google Patents

Abstract

PURPOSE:To decrease signal noises with a device to be evaluated by shortening a transmission line for analog system signals which connects the areas mounting a microcomputer. CONSTITUTION:An area Ec mounting the target microcomputer on an applied equipment 1 is provided with a printed circuit board PCB such as a printed circuit base containing the wiring layers Wtest, W10-W14 and W20-W24. These wiring layers are arranged correspondingly to each external end of a microcomputer 4 for emulation. In other words, the target microcomputer having the same constitution as the computer 4 is mounted while turning upward to the area Ec and a test pin Ptest is connected to the layer Wtest. At the same time, 1st external terminals P10-P14 are connected to layers W10-W14 together with 2nd external terminals P20-P24 connected to layers W20-W24 respectively.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a connection device for a microcomputer in which the signal/input or output function of an external terminal can be switched according to evaluation mode and non-evaluation mode. The present invention relates to technology that is effective when applied to equipment for cycling.

[Prior art]

In the development of microcomputer application equipment, emulators can be used to enable system debugging and evaluation of the system.

This emulator is connected between a system development device such as a parent computer for software development and the application equipment being developed, and it takes over the functions of the microcomputer (target microcomputer) included in the application equipment. On the other hand, it is a microcomputer system development tool that also functions as a debugger and supports system debugging.

A conventional emulator is, for example, "RLSI Handbook" P2O3, published by Ohmsha on November 30, 1980.
As described on pages 563 to 563, an emulation control unit, various memories, a microcomputer that controls them, an emulation microcomputer that performs the functions of the target microcomputer, etc. are built into the main body. It is possible to connect to the target microcomputer mounting area included in the application equipment through a plug provided at the end of the cable extended from the . Further, the emulator main body is connected to a system development device.

[Problem that the invention seeks to solve]

In the conventional emulator as described above, the emulation microcomputer included therein is connected to application equipment via a relatively long cable. Such a cable between the application equipment and the emulation microcomputer constitutes a distributed constant circuit by its own capacitance component. In this case, it is extremely difficult to achieve perfect impedance matching due to variations in the characteristics of cables, etc., so when an emulation microcomputer is supplied with an analog signal or high-frequency signal from an applied device, it is necessary to It becomes more susceptible to noise due to reflections and resonances, which reduces the reliability of the emulator. In particular, if the emulation microcomputer is to operate at high speed, the influence will increase significantly, and the emulation microcomputer F M
When handling analog signals or high-frequency signals such as modulated signals, if the waveform of the analog signal becomes blunt, a phase shift will also occur.

Therefore, the inventor of the present invention first considered making the emulation microcomputer as close to the application equipment as possible, and in particular did not use an evaluation-only microcomputer used exclusively during system debugging and system evaluation as the emulation microcomputer. , when using a single-chip microcomputer as an emulation microcomputer, the signal input or output function of the external terminal can be switched depending on the 3F value mode and the non-evaluation mode, and can also be used as a target microcomputer as it is. We considered connection technology. That is, if the single-chip microcomputer that is rejected is to be used as an emulation microcomputer, an evaluation mode will be set for it.

This allows unnecessary internal bus monitoring in normal non-evaluation mode, but the external pins assigned to it cannot perform the normal signal input/output functions required in non-evaluation mode. It disappears. As a result, in such a case the emulator must internally reproduce the normal signals required in the non-evaluation mode according to the internal bus monitor information and supply them to the application. Therefore, when using a microcomputer such as the single-chip microcomputer mentioned above as an emulation microcomputer, it is necessary to use the single-chip microcomputer as much as possible in the application equipment so as to secure a transfer path for the reproduced signal. It was discovered that a new connection technology was needed to bring them closer together.

An object of the present invention is to provide a device to be evaluated when performing system debugging or system evaluation using a microcomputer whose external terminal signal input or output function can be switched between an evaluation mode and a non-evaluation mode. An object of the present invention is to provide a microcomputer connection device that can reduce signal noise supplied to a microcomputer.

The above and other objects and novel features of the present invention include:
It will become clear from the description of this specification and the accompanying drawings.

[Means for solving problems]

A brief overview of typical inventions disclosed in this application is as follows.

In other words, a microcomputer whose external terminal signal input or output function can be switched between evaluation mode and non-evaluation mode is connected to the evaluation device and the area where the microcomputer is installed in the device under evaluation. A connecting device for a microcomputer, wherein a first external terminal of the microcomputer that monitors an internal bus of the microcomputer is coupled to a tip of a first signal line extending from the evaluation device to the vicinity of the device to be evaluated. , the tip of the second signal line to which the signal reproduced based on the monitor information supplied to the inside of the evaluation device via the first signal line is connected to the microcomputer mounting area of the device to be evaluated. It is.

Furthermore, the signal input or output function is the same in evaluation mode and non-evaluation mode in the microcomputer, and the second external terminal to which analog signals etc. are supplied is connected to the microcomputer via a relatively short third signal line. It is connected to the loading area.

[For production]

According to the above means, the second external terminal of the microcomputer to which an analog signal is supplied is coupled to the microcomputer mounting area of the device to be evaluated via the relatively short third signal line. The analog signal transmission path is made extremely short, thereby achieving a reduction in signal noise supplied from the device under evaluation to the microcomputer.

〔Example〕

FIG. 1 is an exploded perspective view showing one embodiment of a microcomputer connection device (hereinafter simply referred to as a connection device) according to the present invention, and FIG. 2 is an assembled sectional view thereof. The connection device CU shown each time is used in the emulation system shown in FIG. 4, although it is not particularly limited. This system is a microcomputer application system development tool, and executes emulation and various depacking functions for the microcomputer application device 1 to be developed. In the refusal system, 2 is the emulator main body, and its configuration is not directly related to the present invention, so it is not shown in the drawings, but roughly speaking, it includes an emulation control section, various memories, and a microcomputer that controls them. It includes an emulation function, a real-time trace function, a break function, a memory proxy function, and other debug functions for the application device 1. Execution of each function is controlled by a system development device 3 that includes the emulator main body 2 and a parent computer connected via an interface cable IFC or the like.

In order to connect such a system and the application device 1-, a connection device CU comprising an emulation microcomputer 4 mounted on the tip of the cable CL extending from the emulator main body 2 to the application device 1 is provided. ing.

In the emulation system described above, an emulation microcomputer 4 is required that performs the functions of a not-shown microcomputer (target microcomputer) included in the application device 1 for which the system is to be developed.

Conventionally, the emulation microcomputer 4 is built into the emulator main body, but in the system t1 to which the connection device CU of the present invention is applied, such an emulation microcomputer 4 is built into the connection device CU. It will be installed.

Here, the emulation microcomputer 4 has the same or equivalent functions as a target microcomputer (not shown).

The emulation microcomputer 4 in this embodiment is a single-chip microcomputer in which the signal input or output function (hereinafter simply referred to as signal input/output function) of an external terminal can be switched according to evaluation mode or non-evaluation mode. If the signal input/output function of the external terminal is set to non-evaluation mode, it can also be used as a target microcomputer.6 The emulation microcomputer 4 has a first The test pin P tes shown in the figure
t is provided, and although not particularly limited, the test pin P
The non-evaluation mode is set by supplying a low level signal to test, and the test pin P
The evaluation mode is set by supplying a high level signal to test. The non-evaluation mode is an operation mode necessary for normal control of the application equipment 1 according to this embodiment of the system to which the microcomputer is applied. The evaluation mode is an operation mode used when debugging or evaluating a system to which the microcomputer is applied, and is a single operation mode in which unnecessary internal buses can be monitored in the non-evaluation mode. For example, the signals to be monitored may include address signals to be provided to the program memory, data to be read thereby,
Various data and control signals are sent and received only within the pond.

The emulation microcomputer 4 includes:
Although not particularly limited, each device is configured to incorporate functional blocks such as a processor, a program memory, a data memory, various I10 ports, a timer, and a serial communication interface (not shown).

The emulation microcomputer 4 includes:
Although not particularly limited, as shown in FIG. 1, the first external terminals P1. , to P14, and the second external terminal P2. to P2. is provided. The respective first external terminals P1o to Pl4 and second external terminals P2o to P2
S is internally coupled to various I10 ports, etc., but in particular, the second external terminal P2. , to P2. is assigned to a serial communication interface (not shown) or a communication clock signal for outputting an analog signal. Therefore, the human output of analog signals is at least transmitted to the second external terminal T)2. to P2.
assigned to. The I10 port to which the first external terminals P1o to Pl are internally connected has a signal input/output function that can monitor the internal bus when the evaluation mode is set, in other words, emulation and system debugging. The signal input/output function is changed so that the signals necessary for the emulation can be obtained from the emulation microcomputer 4. Therefore, in evaluation mode.

All data and signals obtained from the first external Z1δ child PI to P14 are digital signals.

Next, a detailed structural explanation of the connection device CU will be given.

Although not particularly limited, the connection device CU shown in FIG. 1 is applied to connection with an application device W1 when a target microcomputer (not shown) is a flat package. That is, as shown in the figure, the mounting area Ec of the target microcomputer in the application device 1 includes wiring layers Wtest, Wln to W1a, W2 . to W2. It consists of These wiring layers are arranged to correspond to external terminals of the emulation microcomputer 4, in other words, to external terminals of a target microcomputer (not shown). That is, the same target microcomputer as the emulation microcomputer 4 is located in the mounting area Ec.
so that the test pin P
test is coupled to the wiring layer Wtest, and its first external terminals P1o to Pl4 are connected to the wiring layers Wl to W1. and a second external terminal P2. Nodo P25 is the wiring layer W
2. ．． to W2. is combined with

The cable CL extending from the emulator main body 2 is not particularly limited, but has a type in which predetermined signal lines are built in parallel to a flat insulating resin that is flexible and heat resistant.

At the tip of the cable CL, as shown in Fig. 1,
Lead terminals Ltest, Llo to Ll4. and L2. L2s to L2s are formed, and the tips of these lead terminals are not particularly limited, but are connected to the central opening C.
It is projected to the inside of the HI and exposed to the outside. The lead terminals (1), 1, to L14 are individually connected to five second signal lines SL2 coupled to the emulator main body 2. Each of the above lead terminals Ltest, Li
[+ to Ll and L2. As shown in FIG. 2, L2S to L2S are wiring layers Wtest,
Wl, , to W14, W2. They are placed on Wl5 to Wl5 and connected and fixed with solder or the like.

In the position adjacent to (considerate to) CH1, there are lead terminals L L test, which correspond to the external terminals of the emulation microcomputer 4 facing downward, as shown in FIG. L L 1., to LL
1 and LL2. , to LL2. are formed, and although each is not particularly limited, both are projected to the inside of the central opening CH2 and exposed to the outside. First external terminals P1fl to I of the emulation microcomputer 4
) 14 corresponds to 11 to terminal ■4r, llI to L
L14 is individually connected to the first signal line S L1 coupled to the emulator main body 2, and is also connected to the test pin Pt of the emulation microcomputer 4.
A lead terminal, test, corresponding to est is connected to a test signal line TSL coupled to the emulator main body 2. Also, the second external terminals 1) 2a to P2. The lead terminals LL2° to LL25 corresponding to the lead terminals 72. to L2. are respectively coupled to each other via a relatively short third signal line SL3. Such lead terminals LLtest, LLl, . . . , LLI4, and LL
2. to LL2. As shown in FIG. 2, they are connected and fixed to the external terminals P test, P L, to PL, and P2o to L15 of the emulation microcomputer 4, which are facing downward, respectively, by half-H. Ru.

In the connection device CU, a high level signal is supplied from the emulator body 2 to the lead terminal L test, whereby the emulation microcomputer 4 is set to evaluation mode. In this M5 operation mode, the emulation microcomputer 4
The first external terminals PI to P14 of the emulator main body 2 are changed to signal input/output functions that can monitor the internal bus. Therefore, the signals required for emulation, debugging, etc. in the emulator main body 2 are transferred to the first external terminals PI to P14. P1
．． .

I) When output from 14, the signal is sent to lead terminal LL1. The signal is supplied to the emulator main body 2 via the LLI4 and the first signal line SLI. The emulator main body 2 performs predetermined system debugging, evaluation, etc. based on the supplied signal. As described above, by setting the evaluation mode in the emulation microcomputer 1, it is possible to monitor unnecessary internal buses in the normal non-evaluation mode, but the external terminal P1 assigned to it. PI, I are capable of performing the normal signal input/output functions required in the non-compensation mode, in other words, the signal input/output functions required for the proxy control operation for the application device 1 in the system of this embodiment. become unable. Therefore, the emulator main body 2 internally reproduces the normal signal required for the proxy control operation for the application TI unit 1 according to the monitor information of the internal bus, etc., and sends it to the second input line SL2 according to a predetermined timing. supply The reproduction signal to decline is supplied to the application device 1 via lead terminals Ll to LL.

The analog signals supplied from the application device 1 to the emulation microcomputer 4 are routed through the wiring layer W2. in the microcomputer mounting area EC. ．． to W2. Lead terminal L2. ．． ~ I, 2
5 to lead terminals LL2.5 through relatively short third signal lines Sr, 3. to LL2. The signal is supplied to the second external terminals P2o to I)25 of the emulation microcomputer 4 via the signal line.

Next, the effects of the above embodiment will be explained.

(1) Analog signals to be supplied from the application device 1 to the emulation microcomputer 4 are sent to the adjacent lead terminals L2. ~ L25 and lead terminal LL
2o to LL25 is relatively short (very short compared to the first signal line SLI and second signal line SL2).
The second external terminal P2. of the emulation microcomputer 4 is connected via the third signal line SL3. , to P2. supplied to Therefore, the second external terminal P2. of the emulation microcomputer 4. to P2. Since the signal transmission path between the microcomputer mounting area Ec and the microcomputer mounting area Ec of the applied equipment 1 is made relatively short, there is no need for any relatively long cable as in the past to be interposed therebetween. In this way, since there is no long cable that would constitute a distributed constant circuit between the development device 1 and the emulation microcomputer 4, the microcomputer 4 is free from vibrations caused by voltage reflection and resonance of high-frequency signals. There is no need to be affected by such noise.

(2) Mounting area): Since the emulation microcomputer 4 is connected to the cable CL with the external terminals in the vertical and horizontal positions reversed from when the microcomputer is mounted directly on the C, the lead Terminal L
2. to L2. and lead terminal LL21. to LL2. With such a simple configuration, the length of the third signal line SL3 that connects the third signal line SL3 can be made the shortest.

(3) Between the emulation microcomputer 4 and the emulator main body 2 there are the first signal line S, 1 and the second signal line SL2, but due to the nature of emulation, voltage reflection etc. Analog signals and high-frequency signals that are easily affected by Since it is usually slow in comparison, the noise effect caused by it is not really a problem.

(4) The emulation microcomputer 4, which can be switched to evaluation mode or non-evaluation mode, is built into one cable CL so that a transfer path for the reproduced signal can be easily secured by the action of the connection device δCU. The first to be done -
Signal line S L 3. To the third signal! ! ;Since the system is connected via AsL3, the versatility of the emulator body 2 can be increased by making the above external terminals common even when expanding the microcomputer model, such as changing the peripheral circuits other than the microcomputer processor. Name; shi< Be able to improve. For conventional emulators that have an emulation microcomputer installed in them, the circuit configuration of the emulator's board must be changed each time the above types of products are introduced. , the response to this was extremely complicated.

(5) From the above operation and effect (4), the connection device C of this embodiment
By applying U, an emulation microcomputer that can switch between evaluation mode and non-evaluation mode can be easily used for system depacking and system evaluation, so when a new microcomputer is developed, the relevant At the same time as the development of microcomputers, tools for system development were available, allowing for early development of microcomputer systems.

Although the invention made by the present inventor has been specifically explained based on Examples above, the present invention is not limited to the above Examples, and it should be noted that various changes can be made without departing from the gist of the invention. Not even.

For example, the connection device CU in the above embodiment is applied to an application device 1 in which the mounting area Ec of the microcomputer is constituted by a full wiring layer,
In other words, although the description has been made of the case where the application is applied to applied equipment that has a mounting area for a package that can be mounted in a fixed manner, such as a flat package, the present invention is not limited to this, and also applies to pin insertion type devices. be able to. In that case, for example, as shown in FIG. 3, the lead terminals L test, L il+ to L
I4, L2. The shapes of 2S to 2S are configured as pins that can be inserted into the mounting area 2C, and the tip of the cable CI is configured as a plug, and the lead terminal LLtest is
.

r, r, ■, to LLI4. LL2. ．． to LL2.
The shape may be a lead pole type into which the lead pins of the pin insertion type microcomputer 4 can be inserted, and the portion thereof may be configured in the shape of a socket 1.

Further, in the above embodiment, lead terminals L2° to L25 and lead terminals LL2. ．． In order to minimize the length of the third signal line SL3 that connects LL2 to LL2 with a simple configuration, when the microcomputer is mounted in the mounting areas F and c, the vertical and horizontal positions of the external terminals are The emulation microcomputer is mounted in the opposite direction, but the present invention is not limited to this. The connection direction of the emulation microcomputer can be changed accordingly.

The above explanation has mainly been about the application of the invention made by the present inventor to emulators, which is the technical field behind the invention, but it is not limited thereto, and can be applied to various microcomputer system development tools. can. The present invention is not limited to the case where it is applied to a single-chip microcomputer as in the above embodiment, but the present invention is applicable to a microcomputer in which at least the signal input/output function of an external terminal can be switched according to an evaluation mode and a non-evaluation mode. It can be applied to conditions where the evaluation device is connected to the mounting area of the microcomputer directly in the device to be evaluated.

〔Effect of the invention〕

A brief explanation of the effects obtained by typical inventions disclosed in this application is as follows.

That is, a first external terminal for monitoring the internal bus of the microcomputer is connected to the tip of a first signal line extending from the evaluation device to the vicinity of the device to be evaluated, and the first external terminal is connected to the end of the first signal line extending from the evaluation device to the vicinity of the device being evaluated. A second signal line to which a signal reproduced based on the monitor information supplied to the inside of the evaluation device is supplied is coupled to the microcomputer mounting area of the device under evaluation, and is further connected to a signal input line in evaluation mode and non-evaluation mode. Alternatively, the second external terminal, which has the same output function and supplies analog signals, etc., is connected to the microcomputer mounting area via a relatively short third signal line, so that analog signals are supplied. like second
The analog signal transmission path connecting the external terminal and the microcomputer mounting area of the device to be evaluated is shortened, thereby significantly reducing signal noise supplied from the device to be evaluated to the microcomputer.

[Brief Description of the Drawings] Fig. 1 is an exploded perspective view showing one embodiment of a microcomputer connection device according to the present invention, Fig. 2 is an assembled sectional view of the same connection device, and Fig. 3 is a microcomputer connection. μ
Figure 4 is an explanatory diagram of an emulation system to which a microcomputer connection device is applied. 1... Application equipment, 2... Emulator body, 3...
System development equipment, 4... Emulation microcomputer, CR,... Cable, SLI...
1st signal line, SI, 2... 2nd signal line, SL 3.
...Third signal line, CU...Microcomputer connection device, PCI3...Wiring board, p test...
Test pin, pHI to Pl,...first external terminal, P
2. , to P2. ...Second external terminal, Ec...Microcomputer mounting area. Wtcst, Wlo to W I4. W 2. , to W
25-=wiring layer, ■, tCst, L10 to LI4
．． L2. ~L25--Lead terminal, L L tes
t, L L lo to LI, 1. , LI, 2o to L
L 2. = Lead terminal.

Claims (1)

[Claims] 1. A microcomputer whose external terminal signal input/output function can be switched between evaluation mode and non-evaluation mode is connected to the evaluation device and the area where the microcomputer is mounted in the device to be evaluated. A connecting device for a microcomputer, the first external terminal of which has different signal input or output functions in evaluation mode and non-evaluation mode of the microcomputer, extends from the evaluation device to the vicinity of the device to be evaluated. A second signal line is coupled to the tip of the signal line, and is supplied with a signal adjusted in the same way as in the non-evaluation mode by being supplied to the inside of the evaluation apparatus via the first signal line. The second external terminal, which is connected to the microcomputer mounting area and has the same signal input or output function in the evaluation mode and non-evaluation mode of the microcomputer, is connected to the microcomputer mounting area via a relatively short third signal line. A microcomputer connection device characterized in that it is connected to a microcomputer. 2. The microcontroller according to claim 1, wherein the first to third signal lines are built into one cable connected to the evaluation device and the device to be evaluated. Computer connection device. 3. The microcomputer connection device according to claim 1, wherein the evaluation device is an emulator. 4. The microcomputer according to claim 1, wherein the second external terminal includes an analog signal terminal, and the first external terminal does not include an analog signal terminal. Connection device. 5. The microcomputer connection device according to claim 1, wherein the microcomputer is a single-chip microcomputer.