KR102177406B1 - Apparatus for monitoring and recovering protocol and the method thereof - Google Patents

Abstract

The present invention relates to an apparatus and method for monitoring and recovering a protocol, and when a Serial Advanced Technology Attachment (SATA) interface is started between a host and a device in a vehicle AVN (Audio, Video, Navigation) device, a protocol transmitted from the host to the device A protocol monitor that captures a signal and a pre-input normal protocol are stored in an internal buffer, and the protocol signal captured from the protocol monitor is compared with a pre-input protocol to determine a protocol error, and in case of a protocol error, the host's SATA controller is It includes a protocol controller that restores the normal protocol after reset.

Description

Protocol monitoring and recovery device and its method {APPARATUS FOR MONITORING AND RECOVERING PROTOCOL AND THE METHOD THEREOF}

The present invention relates to a protocol monitoring and recovery apparatus and a method thereof, and more particularly, by monitoring a serial advanced technology attachment (SATA) interface signal between a solid state drive (SSD) and a micro controller unit (MCU) in real time, when a protocol error occurs. It relates to an apparatus and method for monitoring and recovering protocols that enable automatic recovery.

In general, navigation is an indispensable device for automobiles, but general navigation installed on the dashboard rather interferes with driving. Therefore, drivers who are concerned about safety install a buried navigation system. The place to install it becomes ambiguous.

Accordingly, in recent years, it is common to install an AVN (Audio, Video, Navigation) device in which all car audio, video, and navigation functions are combined.

At this time, the AVN device is a variety of interfaces for an interface between a control device (eg, MCU) and an internal storage device (eg, SSD, hard disk, memory, etc.) and external devices (eg, USB memory, front/rear camera, mobile phone, etc.) (Example: SATA, USB, etc.) features are included.

In particular, the SATA protocol establishes an interface through mutual communication between the SATA PHY stage immediately after the start of a power event (i.e., power-on) of the system (e.g. AVN device). In this case, if an error occurs in the protocol, the host and the device go into an infinite standby state. There is a problem in that the system malfunctions due to the inability to read OS/Image/Driver from the storage device due to the entry.

In other words, a protocol error occurs during the establishment of the SATA interface, and the host (e.g., MCU) and device (e.g., SSD) enter an infinite standby state, and the OS/Image/Driver, etc. cannot be read from the storage device. error: An error that stops processing until the state is restored due to software or user intervention). Various problems can occur.

Background art of the present invention is disclosed in Korean Patent Application Laid-Open No. 10-2010-0057324 (published on May 31, 2010, a SATA interface device connecting a host computer and an external device).

The present invention was created to solve the above problems, and provides a protocol monitoring and recovery apparatus and method for automatically recovering when a protocol error occurs by monitoring a SATA interface signal between SSD and MCU in real time. There is this.

Another object of the present invention is to provide a protocol monitoring and recovery apparatus and method for maximizing Signal Integrity efficiency through correction of chip-to-chip signaling. .

Another object of the present invention is to provide a protocol monitoring and recovery apparatus and a method for stabilizing a system through immediate recovery when an interface error occurs between chips.

Protocol monitoring and recovery apparatus according to an aspect of the present invention, when a serial Advanced Technology Attachment (SATA) interface between a host and a device in a vehicle AVN (Audio, Video, Navigation) device is started, the protocol transmitted from the host to the device A protocol monitor to capture the signal; And storing the previously inputted normal protocol in an internal buffer, comparing the protocol signal captured from the protocol monitor with the previously inputted protocol, determining a protocol error, and resetting the host's SATA controller to a normal protocol. It characterized in that it comprises a; protocol controller to recover.

In the present invention, the monitoring and recovery device is an internal compensation device for compensating for a loss that may occur in the protocol signal transmitted/received between the host and the device, and includes at least one of a terminator and pre/de-emphasis. Characterized in that.

In the present invention, the monitoring and recovery device comprises: an equalizer that compensates for an impedance mismatch that may be generated by the protocol monitor or a change in signal amplitude; And an equalizer controller that transmits a protocol signal compensated through the equalizer to the host and device.

In the present invention, the host and the device correspond to one of an MCU and a storage device, and when the MCU is a host, the storage device becomes a device, and when the storage device is a host, the MCU becomes a device. It is characterized.

Protocol monitoring and recovery method according to another aspect of the present invention, when a SATA interface between a host and a device is started in a vehicle AVN device, a protocol that has been previously input to an internal buffer by a protocol controller and a real-time transmission/reception between the host and the device. Capturing and comparing protocols to be performed; Determining, at the protocol controller, whether the protocol captured in real time is different from a previously input protocol through comparison of the protocols; And if the protocol captured in real time is different from the previously input protocol, the protocol controller resetting the SATA controller of the host and then restoring to a normal protocol.

In the present invention, after the step of restoring to a normal protocol after resetting the SATA controller, when the host performs the SATA interface with the device again using the restored protocol, an equalizer receives the restored protocol signal and receives a signal. Determining integrity; When loss of the protocol signal occurs, the equalizer compensating for the loss of the protocol signal; And transmitting, by an equalizer controller, the protocol signal compensated through the equalizer to the device.

In the present invention, in the step of compensating the loss of the protocol signal by the equalizer, the equalizer is an internal compensating device for compensating for a loss that may occur in the protocol signal transmitted/received between the host and the device. It characterized in that it includes at least one of / the empathy.

In the present invention, the host and the device correspond to one of an MCU and a storage device, and when the MCU is a host, the storage device becomes a device, and when the storage device is a host, the MCU becomes a device. It is characterized.

The present invention enables real-time monitoring of the SATA interface signal between the SSD and the MCU to automatically recover in case of a protocol error, and maximizes signal integrity efficiency through correction of signaling between chips, and immediately when an interface error occurs between chips. The system can be stabilized through recovery.

1 is an exemplary view showing a schematic configuration of a protocol monitoring and recovery apparatus according to an embodiment of the present invention.
FIG. 2 is an exemplary diagram for explaining the operation of a protocol monitoring and recovery apparatus in FIG. 1;
3 is an exemplary view showing a more detailed configuration of a protocol monitoring and recovery apparatus in FIG. 1;
4 is a flowchart illustrating a method of monitoring and recovering a protocol according to an embodiment of the present invention.

Hereinafter, an embodiment of a protocol monitoring and recovery apparatus and method according to the present invention will be described with reference to the accompanying drawings.

In this process, the thickness of the lines or the size of components shown in the drawings may be exaggerated for clarity and convenience of description. In addition, terms to be described later are terms defined in consideration of functions in the present invention and may vary according to the intention or custom of users or operators. Therefore, definitions of these terms should be made based on the contents throughout the present specification.

In the present invention, when an error in the protocol occurs during establishment of the SATA interface, the host and the device enter the infinite standby state, and thus, when various problems such as critical errors occur because the OS/Image/Driver cannot be read from the storage device, It relates to an apparatus and a method for stabilizing a system.

In the present invention, in order to immediately recover in the event of an error as described above, as shown in FIG. 1, at least one or more previously inputted through the protocol monitoring and recovery apparatus according to the present embodiment in the intermediate section of the interface between the host and the device. When it is determined that it is abnormal by comparing and analyzing the SATA protocol that performs the operation (e.g. OOB (Out Of Band) test, BIST (Built In Self Test), COMINIT, COMWAKE, etc.) and the real-time captured protocol, the above After the protocol monitoring and recovery device immediately resets the host, it corrects the mismatched error packet to the correct information and sends it to the host to perform self-recovery to restore the system (e.g. AVN device). It is characterized by stabilizing.

In addition, the present invention is to prevent jitter and noise from occurring due to impedance mismatch of TX/RX signals (transmission/reception signals) caused by the intervention of the protocol monitoring and recovery device according to the present embodiment. A terminator (a device that absorbs transmission energy by attaching an electric resistance equal to the characteristic impedance of the line at the end of a transmission line) is added, and a signal-to-noise ratio (pre-emphasis and de-emphasis) is applied to the transmission/reception signal. It is characterized by maintaining signal integrity by improving S/N).

1 is an exemplary diagram showing a schematic configuration of a protocol monitoring and recovery apparatus according to an embodiment of the present invention.

As shown in Figure 1, the protocol monitoring and recovery apparatus 300 according to the present embodiment is a pre-input operation in the middle section of the interface between the host 100 and the device 200 (for example, OOB (Out Of Band) Test, BIST (Built In Self Test), COMINIT, COMWAKE, etc.) and the real-time captured protocol are compared and analyzed to determine normal/abnormal operation.

And according to the determination result, if it is determined that the captured protocol is an abnormal operation, the host 100 is immediately reset, and then the mismatched error packet is corrected with correct information. ) To execute self-recovery.

For example, in this embodiment, the host 100 is a Mirco Controller Unit (MCU), which performs functions such as a graphic engine, a memory controller, and a SATA controller, and the device 200 is a solid state drive (SSD), and power consumption. And Access/Write/Read time is far superior to that of HDD (hard disk), and it is assumed that it is a mass storage device applicable to AVN devices for vehicles.

Hereinafter, the operation of the apparatus for monitoring and recovering the protocol will be described.

2 is an exemplary diagram for explaining the operation of the apparatus for monitoring and recovering a protocol in FIG. 1.

As shown in FIG. 2, the protocol monitoring and recovery apparatus 300 according to this embodiment monitors the transmission/reception signal interface between the host 100 and the device 300, and an internal buffer (not shown) by the user. When an error is determined by comparing a normal protocol (e.g., SATA protocol) stored in advance in (e.g., SATA protocol) and a protocol captured in real time from the host 100 and the device 200, an error compared to the previously entered normal protocol The protocol signal determined to be recovered is performed, and a recovery signal P_CNTRL is transmitted after the host 100 is reset.

Accordingly, even if a protocol error occurs between the host 100 and the device 200, communication between the host 100 and the device 200 can be immediately resumed.

In addition, an internal compensation device (e.g. terminator, pre-emphasis/de-emphasis, etc.) to compensate for loss that may occur in the transmission/reception signal through the monitoring and recovery device 300 of the protocol is monitored and recovered for the protocol. It is included in the device 300 to ensure a signal integrity margin.

FIG. 3 is an exemplary diagram showing a more detailed configuration of a protocol monitoring and recovery apparatus in FIG. 1.

As shown in FIG. 3, the apparatus 300 for monitoring and recovering a protocol according to this embodiment includes a first internal protocol monitor 310, a first equalizer 320, and an equalizer controller (Equal. CNTRL) 330. , A protocol controller (Protocol CNTRL) 340, a second internal protocol monitor 350, and a second equalizer 360.

The first internal protocol monitor 310 captures signals TX1+ and TX1- transmitted from the host 100 to the device 200.

The second internal protocol monitor 350 captures signals TX2+ and TX2- transmitted from the device 200 to the host 100.

The first equalizer 320 compensates for an impedance mis-matching or a change in a signal amplitude that may occur through the first internal protocol monitor 310.

The second equalizer 360 compensates for an impedance mis-matching or a change in a signal amplitude that may occur through the second internal protocol monitor 350.

The protocol controller 340 stores a standard protocol (normal protocol) previously input by a user in an internal buffer (not shown), and transmits/receives captured from the first and second internal protocol monitors 310 and 350 The signal is compared with the pre-input protocol.

And, if it is determined that there is an error in the protocol captured in real time according to the comparison result, the protocol controller 340 transmits a recovery signal (P_CNTRL) after reset of the host 100, The protocol signal that is determined to be an error compared to the protocol is recovered.

In addition, the equalizer controller 330 transmits the compensated protocol transmission/reception signals to the host 100 and the device 200 through the first and second equalizers 320 and 360.

4 is a flowchart illustrating a protocol monitoring and recovery method according to an embodiment of the present invention.

As shown in FIG. 4, when the SATA interface between the host 100 and the device 200 of the AVN device starts (S101), the protocol controller 340 of the protocol monitoring and recovery apparatus 300 according to the present embodiment Captures and compares the protocol input in advance with the protocol transmitted/received in real time between the host 100 and the device 200 (S102).

Through the comparison of the protocols, the protocol controller 340 determines whether the real-time monitored (captured) protocol is different from the previously input protocol (S103).

And according to the determination result, if the real-time monitored (captured) protocol is different from the previously input protocol (No in S103), the protocol controller 340 resets the host 100 (ie, the host's SATA controller). And then recover (S104).

Accordingly, the host 100 performs the SATA interface with the device 200 again using the restored protocol, and transmits the restored protocol signal to the equalizer of the protocol monitoring and restoration apparatus 300 according to the present embodiment. 320) is transmitted (S105), and the integrity of the protocol signal is determined (S106).

When loss occurs in the signal according to the result of the integrity determination (No in S106), that is, loss in the protocol signal through the protocol monitoring and recovery device 300 (eg, signal attenuation due to jitter, noise, etc.) When this occurs, the equalizer 320 compensates for the protocol signal through an internal compensation device (eg, terminator, pre/de-emphasis, etc.) (S107).

That is, the protocol signal (Tx/Rx signal) between the host 100 and the device 200 is impedance-mismatched by the protocol monitoring and recovery device 300 according to the present embodiment, or a signal amplitude In the event that normal interpretation is impossible at the receiving end of the device 200 due to the influence of the device 200, the equalizer 320 compensates for the protocol signal and transmits the compensated protocol signal to the device 200 under the control of the equalizer controller 330. .

Meanwhile, in the above embodiment, a case where the host 100 is an MCU and the device 200 is a storage device (SSD) has been described, but when the host 100 and the device 200 are opposite to each other (that is, transmission of a protocol signal) Note that the same method applies to the case where the device and the receiving device are opposite).

As described above, the present invention has been described with reference to the embodiments shown in the drawings, but these are only exemplary, and those of ordinary skill in the field to which the technology pertains, various modifications and other equivalent embodiments are possible. I will understand the point. Therefore, the technical protection scope of the present invention should be determined by the following claims.

100: host
200: device
300: Protocol monitoring and recovery device
310: First internal protocol monitor
320: first equalizer
330: equalizer controller
340: protocol controller
350: second internal protocol monitor
360: second equalizer

Claims (8)

When the Serial Advanced Technology Attachment (SATA) interface is started between a host and a device in an audio, video, navigation (AVN) device for a vehicle, a protocol monitor for capturing a protocol signal transmitted/received between the host and the device; And
Stores the previously input normal protocol in the internal buffer, compares the protocol signal transmitted/received between the host and the device captured from the protocol monitor with the previously stored normal protocol to determine a protocol error, and in case of a protocol error, the host's SATA controller Including; a protocol controller for restoring to a normal protocol after resetting
The protocol monitor,
A first internal protocol monitor that captures a signal (TX1+, TX1-) transmitted from the host to the device; And a second internal protocol monitor that captures a signal (TX2+, TX2-) transmitted from the device to the host,
The protocol controller,
The normal protocol previously input by the user is stored in the internal buffer, the transmitted or received signals captured from the first and second internal protocol monitors are compared with the previously input protocol, and errors in the captured protocol in real time according to the comparison result If it is determined that there is, after the host is reset, a recovery signal is transmitted to recover the protocol signal determined as an error compared to the previously input normal protocol,
A first equalizer that compensates for an impedance mismatch that may occur through the first internal protocol monitor or a change in signal amplitude; And a second equalizer that compensates for impedance mismatching or a change in signal amplitude that may occur through the second internal protocol monitor.
delete delete The method of claim 1,
The host and device correspond to one of an MCU and a storage device,
When the MCU is a host, a storage device becomes a device, and when the storage device is a host, MCU becomes a device.
When the SATA interface between the host and the device is started in the vehicle AVN device, the protocol monitor captures the protocol signal transmitted/received in real time between the host and the device, and the protocol controller has the protocol previously stored in the internal buffer and the captured host. Comparing protocol signals transmitted/received in real time between devices;
Determining, by the protocol controller, whether the protocol captured in real time is different from a previously stored protocol through comparison of the protocols; And
If the protocol captured in real time is different from the protocol stored in advance, the protocol controller resetting the SATA controller of the host and then restoring to a normal protocol; including,
The protocol monitor,
A first internal protocol monitor for capturing a signal (TX1+, TX1-) transmitted from the host to the device; And a second internal protocol monitor that captures a signal (TX2+, TX2-) transmitted from the device to the host,
The protocol controller,
The normal protocol previously input by the user is stored in the internal buffer, the transmitted or received signals captured from the first and second internal protocol monitors are compared with the previously input protocol, and errors in the captured protocol in real time according to the comparison result If it is determined that there is, after the host is reset, a recovery signal is transmitted to recover the protocol signal determined as an error compared to the previously input normal protocol,
The first equalizer compensates for an impedance mismatch that may occur through the first internal protocol monitor or a change in signal amplitude, and the second equalizer compensates for an impedance mismatch that may occur through the second internal protocol monitor, Or, a method for monitoring and recovering a protocol, characterized in that performing compensation for a change in signal amplitude.
The method of claim 5,
After resetting the SATA controller and restoring to the normal protocol,
When the host performs the SATA interface with the device again using the restored protocol, the first and second equalizers receive the restored protocol signal and determine signal integrity;
When loss of the protocol signal occurs, the first and second equalizers compensate for the loss of the protocol signal; And
And transmitting, by the first and second equalizer controllers, the protocol signals compensated through the first and second equalizers to the device.
delete The method of claim 5,
The host and device correspond to one of an MCU and a storage device,
When the MCU is a host, a storage device becomes a device, and when the storage device is a host, MCU becomes a device.

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