KR101141421B1 - Mobile digital display interface apparatus - Google Patents

Abstract

The present invention relates to a mobile digital display interface device which stops a state transition when a filler packet is transmitted among the transmitted packets, and reduces power consumption by performing a state transition operation using a field of a packet without a byte counter at the state transition of the packet. A signal processor that converts an input signal into a processable signal, a packet analyzer that analyzes a packet included in a signal processed by the signal processor, and stops a state transition of a preset packet among the packets; Provided is a mobile digital display interface device comprising a parallel-serial conversion unit for converting a signal from the analysis unit into a serial signal.

Description

Mobile digital display interface device {MOBILE DIGITAL DISPLAY INTERFACE APPARATUS}

The present invention relates to a mobile digital display interface device, and more particularly, stops the state transition when a filler packet is transmitted among the transmitted packets, and performs a state transition operation using a field of the packet without a byte counter. The present invention relates to a mobile digital display interface device having reduced power consumption.

Recently, in mobile mobile communication devices such as portable computers, wireless telephones, and personal digital assistants (PDAs), mobile devices have been developed to enable high-speed data communications through short-range communication links between host communication devices and client audio / video devices. Mobile Digital Display Interface (MDDI) has been published.

The mobile digital display interface transmits data at a high data rate in order to transmit high resolution image data and high quality audio information or data signals, but requires a considerable amount of power consumption as data is transmitted at a high data rate.

An object of the present invention is a mobile digital display interface device which stops the state transition when the filler packet is transmitted among the transmitted packets, and reduces the power consumption by performing the state transition operation using the field of the packet without the byte counter at the state transition of the packet. To provide.

In order to achieve the above object, one technical aspect of the present invention is a signal processor for converting an input signal into a processable signal, and the packet included in the signal processed by the signal processor to analyze the packet in advance of the packet; It provides a mobile digital display interface device comprising a packet analyzer for stopping the state transition of the set packet, and a parallel-serial converter for converting the signal from the packet analyzer to a serial signal.

According to one technical aspect of the present invention, the packet analysis unit may include a state transition for stopping a state transition of a packet included in a signal processed by the signal processing unit and stopping a state of a filler packet among the packets. Can be.

According to one technical aspect of the present invention, the packet includes a packet length field, a packet type field, an ID field, a data field and a CRC field, and the state transition includes the included packet length field and ID field of the packet. And a state transition of the packet by using a presence or absence of a CRC error in the CRC field.

According to one technical aspect of the present invention, the signal processing unit analog-to-digital converter for converting the input signal into a digital signal, and serial-to-parallel for converting the digital signal converted by the analog-to-digital converter into a parallel signal It may include a transducer.

According to the present invention, when the filler packet is transmitted among the transmitted packets, the state transition is stopped, and the state transition operation is performed using the field of the packet without the byte counter at the state transition of the packet, thereby reducing power consumption.

1 is a schematic structural diagram of a mobile digital display interface of the present invention;
2 is a diagram showing an FSM diagram of a packet analysis unit employed in the mobile digital display interface of the present invention.
3 is a schematic structural diagram of a packet transmitted to a mobile digital display interface of the present invention.
4 is a schematic structural diagram of a subframe of a packet transmitted to the mobile digital display interface of the present invention.

Hereinafter, the present invention will be described in detail with reference to the drawings.

1 is a schematic diagram of a mobile digital display interface of the present invention.

Referring to FIG. 1, the mobile digital display interface of the present invention may include a signal processor 110, a packet analyzer 120, and a parallel-serial converter 130.

The signal processor 110 may include an analog-digital converter 111 and a serial-to-parallel converter 112.

The analog-to-digital converter 111 may be an analog input signal, and thus may convert the input analog signal into a processable digital signal.

The serial-to-parallel converter 112 may convert a digital signal from the analog-to-digital converter 111 into a parallel signal.

The above-described input signal may be a signal transmitted from a host using a mobile digital display interface, or may be a differential signal. The differential signal may include a data signal and a strobe signal.

The packet analyzer 120 may receive a signal processed signal from the signal processor 110 and analyze a packet included in the signal.

The packet may include, for example, an image packet, an audio packet, a status packet, or a command packet.

The packet may be configured in plural, and a filler packet may be included between the transmitted packets.

The packet analyzer 120 may include a state shifter 121.

The state shifter 121 may shift the state by analyzing the received packet.

The parallel-serial converter 130 converts the data to be transmitted serially according to the state transition of the state shifter 121 and transmits the serial data.

FIG. 2 is a diagram illustrating an FSM diagram of a packet analyzer adopted in the mobile digital display interface of the present invention.

Referring to FIG. 2, when the packet is delivered in the WAIT, the state transition unit 121 may perform a video stream state, a round trip state, and a reverse link packet according to the received packet type. REVERSE LINK) can be used to transition the state. If no packets are forwarded from the host, the ecosystem is in a NO SYNC state.

At this time, if the packet type field and the unique word field of the header of the subframe packet satisfy con1, the FOUND SYNC state is activated, and this state means that the subframe packet is transmitted.

If the FOUND SYNC or WAIT state is activated and the packet type field and ID field of the packet satisfy con2, the current state transitions to the ROUND TRIP state. This state means that the round trip delay measurement packet is received, and the parallel-to-serial converter 130 transmits reverse data as a serial signal.

3 is a schematic structural diagram of a packet transmitted to a mobile digital display interface of the present invention.

Referring to FIG. 3 together with FIGS. 1 and 2, the determination of the state transition may be based on whether the received packet corresponds to con1, con2, con3, con4, con5, con6, and the con1, con2, con3, con4, con5, and con6 may be set as shown in the following table according to the type of packet, ID, CRC error, and the like. When a CRC error occurs, a state transition may occur in sync error packets SYNC ERROR1 and SYNC ERROR2.

Inputs Packet Type (2B) Unique Word  (2B)
( Client ID ) CRC cond1 0x3BFF 0x005A No errors cond2 0x0052 0x0000 No errors cond3 0x0041 0x0000 No errors cond4 0x0010 0x0000 No errors cond5 - - Errors cond6 - - No errors

At this time, when a filler packet is transmitted among the transmitted packets, the state transition operation is stopped for the filler packet.

The above-described filler packet is a state that the data contained in the packet that can be formed in the untransmitted portion of the packet during transmission of the video stream packet or is insignificant for the reproduction of video, audio, etc., for example. Even if the transition operation is stopped, there is no effect on restoring the data contained in the packet.

In addition, in general, for the state transition, the byte of the transmitted packet is counted and compared with the packet length information included in the packet length field of the packet. However, the state transition 121 of the present invention is a packet type included in the packet type field. The state transition operation can be performed only by the presence of the information, the ID information of the ID field, and the presence or absence of a CRC error of the CRC field.

That is, the state shifter 121 of the present invention does not perform a state transition with respect to the filler packet having meaningless data and does not count bytes at the time of state transition, and packet length information included in the packet length field and ID information of the ID field. And the state transition operation only with or without a CRC error in the CRC field, thereby reducing power consumption.

4 is a schematic structural diagram of a subframe of a packet transmitted to the mobile digital display interface of the present invention.

As shown in FIG. 4, for example, a subframe includes a field A including a subframe header packet, a reverse link including packet, a round trip delay measurement packet, a field B including filler packets, and a video. A field C including a stream and a field D including filler packets may be included.

 Assuming the power dissipation when a 1-bit transition of the flip-flop is T, the power consumed by a typical state transition, which counts bytes and performs state transitions and transitions state for all packets, is Equation 1 is as follows.

(Formula 1)

(44us means the transmission time of the filler packet and 32.5M means).

In this case, 11T means power consumed when the state transition is caused by other packets except the filler packet in one sub frame period, and 1689T means power consumed when countering bytes of other packets except the filler packet.

This adds up to 1700T, and the state transition 121 of the present invention only transitions other packets except the filler packet, and performs a state transition with a packet type field, an ID field, and the presence or absence of a CRC error instead of a byte count. Can consume.

Accordingly, according to the present invention, a power consumption reduction of approximately 50% or more can be achieved in comparison with a mobile digital display interface including a general state transition, and the circuit area can be reduced as the byte counter is excluded.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not intended to limit the invention to the particular forms disclosed. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

110 ... signal processing unit
111 Analog-to-Digital Converter
112 ... Serial to Parallel Converter
120 ... Packet Analysis
121 ... Status Transition
130 ... bottle-to-serial converter

Claims (4)

A signal processor converting an input signal into a processable signal;
A packet analyzer configured to analyze a packet included in a signal processed by the signal processor and stop a state transition of a preset packet among the packets; And
A parallel-serial converter converting a signal from the packet analyzer into a serial signal
Mobile digital display interface device comprising a. The method of claim 1,
The packet analysis unit is a state transition for stopping the state transition of the filler (filler) packet of the packet while the state transition of the packet included in the signal processed by the signal processor
Mobile digital display interface device comprising a. The method of claim 2,
The packet comprises a packet length field, a packet type field, an ID field, a data field and a CRC field,
And the state transition unit performs a state transition of the packet by using the presence or absence of a CRC error in the packet length field, ID field, and CRC field included in the packet. The method of claim 1, wherein the signal processing unit
An analog-digital converter for converting the input signal into a digital signal; And
Serial-to-parallel converter that converts the digital signal converted by the analog-to-digital converter into a parallel signal
Mobile digital display interface device comprising a.

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