JP2003099336A - Usb communication evaluation system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To evaluate USB communication of a one-chip microcomputer provided with a built-in USB function device, without using an expensive protocol analyzer. SOLUTION: The USB function device 12 and a USB communication monitoring circuit 111 for sampling inputting and outputting of the signals of a USB transceiver 16 are provided inside the one-chip microcomputer 11 provided with a built-in USB function device. USB communication data are outputted to the outside of the chip via the general-purpose input and output ports 113 of the one-chip microcomputer 11 or a debugging system, such as an in-circuit emulator and so on, and the evaluation of the USB communication is made by a general-purpose logic analyzer 114, a general-purpose debugger or the like.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a USB (Universa
l Serial Bus) The present invention relates to a USB communication evaluation system for evaluating USB communication in a one-chip microcomputer having a function device function.

[0002]

2. Description of the Related Art Conventionally, a USB communication evaluation system is shown in FIG.
The USB function device 51 and the U
USB protocol analyzer 5 between SB host devices 52
3 was connected by USB cables 54 and 55, and the communication data on the USB cables 54 and 55 was analyzed by the USB protocol analyzer 53.

The USB function device 51 is a USB
Function device 56 and USB transceiver 57
It consists of and. Also, the USB host device 52
It is composed of a USB host device 58 and a USB transceiver 59.

[0004]

Even in a one-chip microcomputer having a built-in USB function device function, when USB communication evaluation is performed, in many cases, the USB protocol analyzer as described above is used for USB communication evaluation. It is possible to do.

However, in the conventional configuration of FIG.
As can be seen from the SB standard, which defines the maximum USB cable length, the USB function device 51 and U
It was difficult to debug a problem or the like when the USB bus was directly connected under the actual use condition that the USB protocol analyzer 53 does not exist between the SB host device 52.

For example, when the USB host device is a personal computer and the USB function device is a printer, a scanner, or the like, the host device and the function device should be directly connected to each other during actual use, and a protocol is used between them. There is no analyzer. Here, when a failure does not occur by connecting the analysis device, it is difficult to specify the cause.

Further, the USB protocol analyzer dedicated to USB communication evaluation is an expensive evaluation device for developing a simple USB device device.

It is an object of the present invention to provide a USB communication evaluation system which does not require an expensive dedicated USB protocol analyzer and enables USB communication evaluation under actual product usage conditions.

[0009]

In order to solve this problem, a USB communication evaluation system according to claim 1 of the present invention performs USB communication evaluation of a semiconductor integrated circuit having a USB function device and a USB transceiver. , USB function device and USB
A USB communication data sampling means for sampling a USB communication signal passed between transceivers is built in a semiconductor integrated circuit, and USB communication data output as a sampling result from the USB communication data sampling means is analyzed outside the semiconductor integrated circuit. For this purpose, the semiconductor integrated circuit is provided with USB communication data output means for outputting the data to the outside of the semiconductor integrated circuit.

According to this structure, the USB communication data passed between the USB function device and the USB transceiver is sampled by the USB communication data sampling means, and the sampled USB communication data is outputted by the USB communication data output means. Therefore, the USB communication evaluation of the USB communication data transferred between the USB function device and the USB transceiver can be realized at low cost without using an expensive USB protocol analyzer. Moreover, by configuring the USB communication evaluation circuit with a semiconductor, the characteristics such as the USB communication data signal delay appearing outside the semiconductor integrated circuit are hardly affected as compared with an evaluation device that traces signals outside the semiconductor integrated circuit. It is possible to obtain the effect that an evaluation circuit that does not apply can be realized. That is, in the present invention, since the analysis device is not present on the USB communication cable, it is possible to realize an evaluation circuit that does not affect the USB communication data signal.

According to a second aspect of the present invention, there is provided a USB communication evaluation system according to the first aspect, wherein the USB communication data output means is a general-purpose input / output port of a semiconductor integrated circuit.

According to this structure, since the structure for outputting the USB communication data is the general-purpose input / output port of the semiconductor integrated circuit, the structure for outputting the USB communication data is specially added to the semiconductor integrated circuit. Since there is no need to use the general-purpose I / O port originally provided,
The configuration for performing USB communication evaluation is simple. That is, since the communication data is analyzed outside the semiconductor integrated circuit, the circuit inside the semiconductor integrated circuit can be configured by a simple circuit that only outputs the data obtained by the USB communication data circuit to the general-purpose input / output port.

The USB communication evaluation system according to claim 3 of the present invention is the USB communication evaluation system according to claim 1, wherein the USB output from the USB communication data output means is used.
A general-purpose logic analyzer is used as a means for analyzing communication data outside the semiconductor integrated circuit.

According to this configuration, since the USB communication data is analyzed by the general-purpose logic analyzer, the cost of the device for analysis can be reduced as compared with the conventional USB protocol analyzer.

A USB communication evaluation system according to a fourth aspect of the present invention is the USB communication evaluation system according to the first aspect, wherein the USB communication data output means uses the RAM incorporated in the semiconductor integrated circuit to transfer the USB communication data. accumulate.

According to this configuration, the USB communication data is transferred to the R
Since the data is stored in the AM, the debug circuit can read the data asynchronously, and the USB communication data can be analyzed without being limited by the speed of the debug system.

A USB communication evaluation system according to a fifth aspect of the present invention is the USB communication evaluation system according to the first aspect, wherein the USB communication data output means uses a debug circuit built in a semiconductor integrated circuit. To the outside of the semiconductor integrated circuit.

According to this structure, the USB communication data passed between the USB function device and the USB transceiver is sampled by the USB communication data sampling means, and the sampled USB communication data is outputted by the USB communication data output means. Therefore, the USB communication evaluation of the USB communication data transferred between the USB function device and the USB transceiver can be realized at low cost without using an expensive USB protocol analyzer. Moreover, when debugging the semiconductor integrated circuit, the USB communication evaluation in cooperation with the debug system for the semiconductor integrated circuit can be performed.

A USB communication evaluation system according to a sixth aspect of the present invention is the USB communication evaluation system according to the fourth aspect, wherein the USB communication data output means is stored in the RAM by using a debug circuit built in the semiconductor integrated circuit. The U
The SB communication data is read and output to the outside of the semiconductor integrated circuit.

According to this structure, the USB communication data passed between the USB function device and the USB transceiver is sampled by the USB communication data sampling means, and the sampled USB communication data is outputted by the USB communication data output means. Therefore, the USB communication evaluation of the USB communication data transferred between the USB function device and the USB transceiver can be realized at low cost without using an expensive USB protocol analyzer. Moreover, when debugging the semiconductor integrated circuit, the USB communication evaluation in cooperation with the debug system for the semiconductor integrated circuit can be performed.

A USB communication evaluation system according to a seventh aspect of the present invention is the USB communication evaluation system according to the first aspect, wherein the USB output from the USB communication data output means is used.
A debug system for a semiconductor integrated circuit is used as a means for analyzing communication data outside the semiconductor integrated circuit.

According to this structure, the USB communication data passed between the USB function device and the USB transceiver is sampled by the USB communication data sampling means, and the sampled USB communication data is outputted by the USB communication data output means. Since it is output to the outside of the device, the USB communication evaluation of the USB communication data transferred between the USB function device and the USB transceiver can be debugged for the semiconductor integrated circuit without using an expensive USB protocol analyzer. It can be realized at low cost using the system. Moreover, when debugging the semiconductor integrated circuit, the US
The effect that the B communication evaluation is possible is obtained.

According to a eighth aspect of the present invention, there is provided a USB communication evaluation system according to the sixth aspect, wherein the USB communication evaluation system according to the sixth aspect uses a semiconductor as means for analyzing USB communication data output from the debug circuit outside the semiconductor integrated circuit. Use a debug system for integrated circuits.

According to this structure, the USB communication data passed between the USB function device and the USB transceiver is sampled by the USB communication data sampling means, and the sampled USB communication data is outputted by the USB communication data output means. Since it is output to the outside of the device, the USB communication evaluation of the USB communication data transferred between the USB function device and the USB transceiver can be debugged for the semiconductor integrated circuit without using an expensive USB protocol analyzer. It can be realized at low cost using the system. Moreover, when debugging the semiconductor integrated circuit, the US
The effect that the B communication evaluation is possible is obtained.

The USB communication evaluation system according to claim 9 of the present invention is the USB communication evaluation system according to claim 1, 2, 3, 4, 5, 6, 7 or 8.
In the described USB communication evaluation system, the semiconductor integrated circuit is a microcomputer.

According to this structure, the same operation as in each of the above-described embodiments is performed.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS. 1, 2, 3, 4, 5, and 6.

[First Embodiment] FIG. 1 is a block diagram showing a configuration of a USB communication evaluation system according to a first embodiment of the present invention. In FIG. 1, reference numeral 11 is a one-chip microcomputer with a built-in USB function device. Reference numeral 12 is a USB function device built in the one-chip microcomputer 11. Reference numeral 13 is a USB host device. Reference numeral 14 is a USB host device built in the USB host device 13.
Reference numeral 15 is a USB transceiver built in the USB host device 13. Reference numeral 16 is a USB transceiver built in the one-chip microcomputer 11. 17 is U
It is an SB cable.

Reference numeral 18 denotes the USB function device 12
Is an input signal from the USB transceiver 16. 19
Is an output signal from the USB function device 12 to the USB transceiver 16. Reference numeral 110 is a control signal from the USB function device 12 to the USB transceiver 16. These are referred to as USB communication signals in the claims.

Reference numeral 111 denotes a USB communication monitor circuit which is a USB communication data sampling means built in the one-chip microcomputer 11. 112 is a USB clock. Reference numeral 113 is a general-purpose input / output port of the one-chip microcomputer 11. Reference numeral 114 is a general-purpose logic analyzer. 115 is USB communication data.
Reference numeral 116 is a decoding program. Reference numeral 117 denotes a CPU incorporated in the one-chip microcomputer 11.

The operation of the first embodiment of the present invention configured as above will be described below. In FIG. 1, when communication is performed between the USB function device 12 incorporated in the one-chip microcomputer 11 incorporating the USB function device and the USB host device 14 incorporated in the USB host device 13, the USB transceiver 15 incorporated in the USB host device 13 And a transceiver 16 built in the one-chip microcomputer 11 are connected via a USB cable 17 to communicate serial data according to the USB protocol.

The input signal 18, the output signal 19 and the control signal 110 between the USB function device 12 and the USB transceiver 16 built in the one-chip microcomputer 11 are unidirectional digital signals. Here, the input signal 18, the output signal 19 and the control signal 110 are
Each signal is a plurality of signals, but here, for simplicity, one signal is used.

Input signal 18, output signal 19 and control signal 1
10 is sampled by the USB clock 112 in the USB communication monitor circuit 111 inside the one-chip microcomputer 11, and this sampling data (USB communication data) is transferred to the one-chip microcomputer 11 through the general-purpose input / output port 113. It is output to the outside of the microcomputer 11. As a result, the data output to the outside of the one-chip microcomputer 11 can be traced by the general-purpose logic analyzer 114.

Here, the general-purpose logic analyzer 114
Is a device having a signal trace function.
USB traced by general-purpose logic analyzer 114
By decoding the communication data 115 using the decoding program 116 conforming to the USB protocol,
B Communication evaluation can be performed.

Details of the USB communication evaluation in the USB communication evaluation system of the above embodiment will be described below.

FIG. 3 is a schematic diagram showing an example of a mechanism for reproducing USB communication data. In FIG. 3, 31 is US
B communication raw data (NRZI (NON-RETURN TO ZERO INVER
TED) modulated signal). Reference numeral 32 is an NRZI demodulation pattern. 33 is reproduced communication data.

In FIG. 3, the USB communication raw data (NR
The ZI-modulated signal) 31 is serial communication data that actually passes through the USB cable. In order to reduce the transition of communication data and reduce communication error, when the transfer bit is "1", the signal is not changed and the transfer bit is "0".
Only in the case of, the state of the signal is inverted.

This USB communication raw data 31 is converted into NRZI
The reproduced communication data 33 is generated according to the demodulation pattern 32. Since the NRZI demodulation pattern 32 is a bit change from “1” to “0” in the case of pattern 1, it is a reverse “0” of the previous bit “1”, and a bit change from “0” to “0” in the case of pattern 2. Inversion of previous bit "0" is "1". In case of pattern 3, since bit change from "0" to "1", "0" of holding previous bit "0", pattern 4
In this case, since the bit changes from "1" to "1", demodulation "1" of holding the previous bit "1" is performed, and reproduced communication data 33 is generated.

FIG. 4 is a schematic diagram showing the structure of a USB frame, transaction, and packet. In FIG. 4, reference numeral 34 is a frame. 35 is SOF (Start of F
rame) packet. 36 is a transaction. 37 is a SETUP packet. 38 is DATA
It is 0 packet. 39 is an ACK packet.

The SOF packet is a packet indicating the beginning of a frame. The SETUP packet is a packet used to issue a device request from the host to the endpoint 0. DATA0 packet is
This is a packet for synchronizing data transfer by being used alternately with the DATA1 packet when transferring a plurality of data packets. DATA0 is used for odd-numbered data transfer, and DATA1 is used for even-numbered data transfer.
The ACK packet is a packet which means that the data transfer is normally performed.

In FIG. 4, a frame 34 is a USB
In the case of the 1.1 standard, it is a unit of 1 ms and includes at least the SOF packet 35, and includes the transaction 36 when the USB communication data exists. Transaction 36 is a SETUP packet 37, DATA0
It is a collection of packets such as packet 38 and ACK packet 39, and is one in which data transfer is collectively considered.

FIG. 5 shows a USB packet format. In FIG. 5, reference numeral 310 is a SYNC field. 311 is an EOP. Reference numeral 312 is a token packet. 313 is a data packet. Reference numeral 314 is a handshake packet and a special packet. Three
Reference numeral 15 is an SOF packet.

In FIG. 5, all packets begin with the SYNC field 310, which is the sync pattern, and
It is supposed to end with OP (End of Packet) 311, and handshake packet, special packet 31
There is always a CRC at the end of all other packets except 4, so that it is possible to check whether an error has occurred during transfer. The SOF packet 315 is the token packet 3
It is classified into 12.

FIG. 6 is a conceptual diagram of the USB communication decoding program. In FIG. 6, 41 is USB communication data. 42 is a frame cutout processing unit. 43 is a packet cutout processing unit. Reference numeral 44 is a decoding result.

In FIG. 6, the USB communication decoding program divides the USB communication data 41 into data for each USB frame in the frame cutout processing unit 42. According to the USB1.1 standard, there is one frame every 1 ms. The data in the frame divided by the frame cutout processing unit 42 is divided into USB packets by the PID (packet ID) in the packet cutout unit 43, and data processing is performed for each packet.
The packet has a PID value of "000" represented by 4 bits.
When the value is 1 "," 1001 "," 0101 ", or" 1101 ", the token packet has a PID value of" 0011 "or" 10 ".
When the value is 11 ", the data packet has a PID value of" 001 ".
When it is 0 "," 1010 "," 1110 ", it is a handshake packet, and when the value of PID is" 1100 ", it is a special packet. The USB communication data 41 can be evaluated.

In the packet cutout unit 43,
The four boxes in which the “token packet”, the “data packet”, the “handshake packet”, and the “special packet” are written mean the data itself of the packet cut out in the packet cutout processing unit 43.

According to the USB communication evaluation system of this embodiment, the USB function devices 12 and U
The USB communication data transferred between the SB transceivers 16, that is, the input signal 18, the output signal 19 and the control signal 110 are sampled by the USB communication monitor circuit 111, and the sampled USB communication data is input by a general-purpose input device which is a USB communication data output means. By the output port 113,
Since the output is made to the outside of the one-chip microcomputer 11, the USB function device 1
The USB communication evaluation of the USB communication data transferred between the USB transceiver 2 and the USB transceiver 16 can be realized inexpensively without using an expensive USB protocol analyzer.

Moreover, by constructing the USB communication evaluation circuit with a semiconductor, the USB communication data signal delay and the like appearing outside the one-chip microcomputer can be compared with an evaluation apparatus that traces signals outside the one-chip microcomputer. It is possible to obtain the effect that it is possible to realize an evaluation circuit that hardly affects the characteristics. That is,
According to the present invention, since there is no analysis device on the USB communication cable, it is possible to realize an evaluation circuit that does not affect the USB communication data signal.

Since the configuration for outputting USB communication data is the general-purpose input / output port 113 of the one-chip microcomputer 11, a configuration for outputting USB communication data is added to the one-chip microcomputer 11. Since the general purpose input / output port 113 originally provided can be used, there is no need to do so, and the configuration for performing USB communication evaluation is simple. That is, since the analysis of the communication data is performed outside the microcomputer, the circuit inside the microcomputer can be configured by a simple circuit that only outputs the data obtained by the USB communication data circuit to the general-purpose input / output port.

Further, since the USB communication data is analyzed by the general-purpose logic analyzer 114, the cost of the device for analysis can be reduced as compared with the conventional USB protocol analyzer.

[Second Embodiment] FIG. 2 is a block diagram showing the configuration of a USB communication evaluation system according to a second embodiment of the present invention. In FIG. 2, reference numeral 21 is a one-chip microcomputer with a built-in USB function device. Reference numeral 22 is a USB function device built in the one-chip microcomputer 21. Reference numeral 23 is a USB host device. Reference numeral 24 denotes a USB host device built in the USB host device 23.
Reference numeral 25 is a USB transceiver built in the USB host device 23. Reference numeral 26 is a USB transceiver built in the one-chip microcomputer 21. 27 is U
It is an SB cable.

28 is a USB function device 22
Is an input signal from the USB transceiver 26. 29
Is an output signal from the USB function device 22 to the USB transceiver 26. 210 is a control signal from the USB function device 22 to the USB transceiver 26. These are referred to as USB communication signals in the claims.

Reference numeral 211 is a USB communication monitor circuit built in the one-chip microcomputer 21. 212
Is the USB clock. A RAM 213 is incorporated in the one-chip microcomputer 21 having a USB function. Reference numeral 214 is a microcomputer debug system provided outside. Reference numeral 215 is a microcomputer debug circuit built in the one-chip microcomputer 21. A CPU 216 is built in the one-chip microcomputer 21. Reference numeral 217 is a debug signal. 218 is USB communication data. Reference numeral 219 is a decoding program.

The operation of the second embodiment of the present invention configured as above will be described below. In FIG. 2, when communication is performed between the USB function device 22 incorporated in the one-chip microcomputer 21 incorporating the USB function device and the USB host device 24 incorporated in the USB host device 23, the USB transceiver 25 incorporated in the USB host device 23. And a transceiver 26 built in the one-chip microcomputer 21
However, they are connected via the USB cable 27, and serial data according to the USB protocol is communicated.

The input signal 28, the output signal 29, and the control signal 210 between the USB function device 22 and the USB transceiver 26 built in the one-chip microcomputer 21 are unidirectional digital signals. Here, each of the input signal 28, the output signal 29, and the control signal 210 is a plurality of signals, but here, for simplification, only one signal is used.

Input signal 28, output signal 29, and control signal 2
10 is sampled by the USB clock 212 in the USB communication monitor circuit 211 inside the one-chip microcomputer 21, and this sampling data (USB communication data) is continuously written in the RAM 213 built in the one-chip microcomputer 21. Be done.

Next, the USB communication data traced in the built-in RAM 213 passes through the microcomputer debug circuit 215 built in the one-chip microcomputer 21 at the time of evaluation using the microcomputer debug system 214 for the one-chip microcomputer 21. Then, it is read by the microcomputer debug system 214.

The microcomputer debug circuit 215 uses a normal C
When the PU 216 is debugged, it has a function of reading the information in the chip of the one-chip microcomputer 21 as a data signal of the debug signal 217 including an address signal, a data signal, and various control signals. The microcomputer debug circuit 215 also treats the USB communication data traced in the built-in RAM 213 as a debug data signal inside the chip and reads it out to the microcomputer debug system 214.

By decoding the USB communication data 218 read by the microcomputer debug system 214 by the decoding program 219 according to the USB protocol, it is possible to evaluate the USB communication.

The USB communication evaluation in the USB communication evaluation system of the above-described embodiment can be performed in the same manner as that described in the first embodiment with reference to FIGS. 3 to 6. Is omitted.

While the first embodiment analyzes the data traced (stored) by a general-purpose logic analyzer, the second embodiment differs in that the data stored in the RAM is analyzed.

According to the USB communication evaluation system of this embodiment, the USB function devices 22 and U
The USB communication data transferred between the SB transceivers 26, that is, the input signal 28, the output signal 29, and the control signal 210 are sampled by the USB communication monitor circuit 211, and the sampled USB communication data is the RAM 213 forming the USB communication data output means. Is stored in the USB function device 12 and the USB transceiver 16 as a debug signal 217 to the outside of the one-chip microcomputer 21 by the microcomputer debug circuit 215 which constitutes the USB communication data output means. USB handed over
USB communication evaluation for communication data, expensive USB
It can be realized at low cost by using the microcomputer debug system 214 without using a protocol analyzer. Moreover, at the time of debugging the one-chip microcomputer 21, it is possible to evaluate the USB communication in cooperation with the microcomputer debug system 214 which is the debug system of the one-chip microcomputer 21.

Since the USB communication data is stored in the RAM 213, the microcomputer debug circuit 2
15 can read the data asynchronously,
Analysis of B communication data can be performed without being limited by the speed of the debug system.

Although the one-chip microcomputer has been described in the above embodiment, the present invention is not limited to this, and can be applied to a microcomputer other than one-chip and various other semiconductor integrated circuits.

[0065]

According to the USB communication evaluation system of the first aspect of the present invention, the USB communication data passed between the USB function device and the USB transceiver is sampled by the USB communication data sampling means, and the sampled USB communication is carried out. Since the data is output to the outside of the semiconductor integrated circuit by the USB communication data output means, the US is transferred between the USB function device and the USB transceiver.
USB communication evaluation for B communication data
It can be realized inexpensively without using a B protocol analyzer. Moreover, by configuring the USB communication evaluation circuit with a semiconductor, the characteristics such as the USB communication data signal delay appearing outside the semiconductor integrated circuit are hardly affected as compared with the evaluation device that traces signals outside the semiconductor integrated circuit. An effect that an evaluation circuit that does not apply can be realized is obtained. That is, in the present invention, since the analysis device is not present on the USB communication cable, it is possible to realize an evaluation circuit that does not affect the USB communication data signal.

According to the USB communication evaluation system of the second aspect of the present invention, the structure for outputting the USB communication data is the general-purpose input / output port of the semiconductor integrated circuit.
Since it is not necessary to add a special configuration for outputting USB communication data to the semiconductor integrated circuit and the general-purpose input / output port originally provided can be used, the configuration for performing USB communication evaluation is simple. That is, since the communication data is analyzed outside the semiconductor integrated circuit, the circuit inside the semiconductor integrated circuit can be configured by a simple circuit that only outputs the data obtained by the USB communication data circuit to the general-purpose input / output port.

According to the USB communication evaluation system of claim 3 of the present invention, since the USB communication data is analyzed by the general-purpose logic analyzer, the cost of the device for analysis can be reduced as compared with the conventional USB protocol analyzer. it can.

According to the USB communication evaluation system of the fourth aspect of the present invention, since the USB communication data is stored in the RAM, the debug circuit can read the data asynchronously, and the USB communication data can be analyzed. You can do it without being limited by the speed of the debug system.

According to the USB communication evaluation system of the fifth aspect of the present invention, the USB communication data transferred between the USB function device and the USB transceiver is sampled by the USB communication data sampling means, and the sampled USB communication data is collected. Since the USB communication data output means outputs the data to the outside of the semiconductor integrated circuit, the USB transferred between the USB function device and the USB transceiver is transmitted.
USB communication evaluation for communication data, expensive USB
It can be realized at low cost without using a protocol analyzer. Moreover, when debugging the semiconductor integrated circuit, USB communication evaluation in cooperation with the debug system of the semiconductor integrated circuit is possible.

According to the USB communication evaluation system of the sixth aspect of the present invention, the USB communication data transferred between the USB function device and the USB transceiver is sampled by the USB communication data sampling means, and the sampled USB communication data is collected. Since the USB communication data output means outputs the data to the outside of the semiconductor integrated circuit, the USB transferred between the USB function device and the USB transceiver is transmitted.
USB communication evaluation for communication data, expensive USB
It can be realized at low cost without using a protocol analyzer. Moreover, when debugging the semiconductor integrated circuit, USB communication evaluation in cooperation with the debug system of the semiconductor integrated circuit is possible.

According to the USB communication evaluation system of the seventh aspect of the present invention, the USB communication data transferred between the USB function device and the USB transceiver is sampled by the USB communication data sampling means, and the sampled USB communication data is collected. Since the USB communication data output means outputs the data to the outside of the semiconductor integrated circuit, the USB transferred between the USB function device and the USB transceiver is transmitted.
USB communication evaluation for communication data, expensive USB
It can be realized inexpensively by using a debug system for semiconductor integrated circuits without using a protocol analyzer.
Moreover, when debugging the semiconductor integrated circuit, USB communication evaluation in cooperation with the debug system of the semiconductor integrated circuit is possible.

According to the USB communication evaluation system of the eighth aspect of the present invention, the USB communication data transferred between the USB function device and the USB transceiver is sampled by the USB communication data sampling means, and the sampled USB communication data is collected. Since the USB communication data output means outputs the data to the outside of the semiconductor integrated circuit, the USB transferred between the USB function device and the USB transceiver is transmitted.
USB communication evaluation for communication data, expensive USB
It can be realized inexpensively by using a debug system for semiconductor integrated circuits without using a protocol analyzer.
Moreover, when debugging the semiconductor integrated circuit, USB communication evaluation in cooperation with the debug system of the semiconductor integrated circuit is possible.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a USB communication evaluation system according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a USB communication evaluation system according to a second embodiment of the present invention.

FIG. 3 is a schematic diagram showing an example of a mechanism for reproducing USB communication data.

FIG. 4 is a schematic diagram showing a configuration of a USB frame, transaction, and packet.

FIG. 5 is a schematic diagram showing a format of a USB packet.

FIG. 6 is a conceptual diagram of a USB communication decoding program.

FIG. 7 is a block diagram showing a configuration of a conventional USB communication evaluation system.

[Explanation of symbols]

11 One-Chip Microcomputer 12 USB Function Device 13 USB Host Device 14 USB Host Device 15 USB Transceiver 16 USB Transceiver 17 USB Cable 18 Input Signal 19 Output Signal 110 Control Signal 111 USB Communication Monitor Circuit 112 USB Clock 113 General Purpose Input / Output Port 114 General Purpose Logic analyzer 115 USB communication data 116 Decode program 117 CPU 21 One-chip microcomputer 22 USB function device 23 USB host device 24 USB host device 25 USB transceiver 26 USB transceiver 27 USB cable 28 Input signal 29 Output signal 210 Control signal 211 USB communication monitor Circuit 212 USB clock 213 General-purpose input / output port 21 4 microcomputer debug system 215 microcomputer debug circuit 216 CPU 217 debug signal 218 USB communication data 219 decode program 218 CPU 31 USB communication raw data (NRZI modulation signal) 32 NRZI demodulation pattern 33 reproduced communication data 34 frame 35 SOF packet 36 transaction 37 SETUP packet 38 DATA0 packet 39 ACK packet 310 SYNC field 311 EOP 312 token packet 313 data packet 314 handshake packet, special packet 315 SOF packet 41 USB communication data 42 frame cutout processing unit 43 packet cutout processing unit 44 decoding result 51 USB function device 52 USB host device 53 USB protocol Analyzer 54 USB cable 55 USB cable 56 USB function device 57 USB transceiver 58 USB host device 59 USB Transceiver

Claims (9)

[Claims] 1. USB function device and U
A USB communication evaluation system for evaluating USB communication of a semiconductor integrated circuit having an SB transceiver built-in, comprising: USB communication data sampling means for sampling a USB communication signal transferred between the USB function device and the USB transceiver. U built in a semiconductor integrated circuit and output as a sampling result from the USB communication data sampling means
A USB communication evaluation system characterized in that the semiconductor integrated circuit is provided with USB communication data output means for outputting the SB communication data to the outside of the semiconductor integrated circuit in order to analyze the SB communication data outside the semiconductor integrated circuit. 2. The USB communication evaluation system according to claim 1, wherein the USB communication data output means is a general-purpose input / output port of a semiconductor integrated circuit. 3. The USB communication evaluation system according to claim 1, wherein a general-purpose logic analyzer is used as means for analyzing the USB communication data output from the USB communication data output means outside the semiconductor integrated circuit. 4. The USB communication evaluation system according to claim 1, wherein the USB communication data output means stores the USB communication data by using a RAM incorporated in the semiconductor integrated circuit. 5. The USB communication evaluation according to claim 1, wherein the USB communication data output means outputs the USB communication data to the outside of the semiconductor integrated circuit by using a debug circuit built in the semiconductor integrated circuit. system. 6. The USB communication data output means reads the USB communication data stored in the RAM using a debug circuit built in the semiconductor integrated circuit and outputs the USB communication data to the outside of the semiconductor integrated circuit. U according to item 4
SB communication evaluation system. 7. The USB according to claim 1, wherein a debug system for a semiconductor integrated circuit is used as a means for analyzing the USB communication data output from the USB communication data output means outside the semiconductor integrated circuit. Communication evaluation system. 8. A means for analyzing USB communication data output from a debug circuit outside a semiconductor integrated circuit,
7. The USB communication evaluation system according to claim 6, wherein a debug system for a semiconductor integrated circuit is used. 9. The USB communication evaluation system according to claim 1, 2, 3, 4, 5, 6, 7 or 8, wherein the semiconductor integrated circuit is a microcomputer.