KR20020056633A - Method for interfacing a combo drive system with host - Google Patents

Abstract

PURPOSE: A method of interfacing an optical disk driver with a host is provided to stably interface the optical disk driver supporting both of CDs and DVDs with an external host, thereby stably operating a system without halting operations. CONSTITUTION: A micro computer makes the first signal processing and interfacing unit enabled, and makes the second signal processing and interfacing unit disabled in an initial state(S10). If a command is received from a host(S20), the micro computer sets a busy signal(S21), and interprets the command. If a command for requesting optical disk data is received from the host(S30), the micro computer performs a data transmission process. If an optical disk is a CD(S40), the micro computer maintains the enabled state and the disabled state, and transmits requested CD data(S50), then cancels the busy signal(S51).

Description

Host interface method of optical disk drive device {Method for interfacing a combo drive system with host}

The present invention relates to an interface method between an optical disc drive device and an external host supporting both a CD and a DVD.

1 schematically shows the configuration of a general combo drive system 100, which includes an optical pickup 20 for detecting a recording signal from the surface of an inserted optical disc 10; An R / F unit 30 for filtering the signal detected by the optical pickup 20 and outputting it as a binary signal; CD digital to restore the binary signal to the original data with its own clock phase-locked to the binary signal, and to exchange the data with an external host (PC) 200 according to AT Attached Packet Interface (ATAPI) protocol. A signal processing unit (DSP) & ATAPI interface unit (i / F) 40 and a DVD digital signal processing unit (DSP) & ATAPI interface unit (i / F) 41; And a microcomputer 50 for controlling data exchange with the host 200 according to the ATAPI protocol.

In the general combo drive system as shown in FIG. 1, in order to simultaneously support CD and DVD, CD DSP & ATAPI i / F 40 performing signal processing of CD data and communicating with an external host 200 according to ATAPI protocol. And a DVD DSP & ATAPI i / F 41 for communicating with the external host 200 according to the signal processing of the DVD and the ATAPI protocol, respectively.

That is, when the optical disc 10 is inserted, the microcomputer 50 of the combo drive system 100 determines whether the optical disc 10 is a CD or a DVD according to a series of processes, and according to the determination result, the corresponding DSP & ATAPI i / F Make an active state to respond to the request of the host 200.

However, the disc type discrimination requires a certain time such as spindle drive, optical pickup 20 internal actuator drive, and CD / DVD laser switching. During this time, the DSP responds to the command of the host. & ATAPI i / F is not defined. Therefore, the combo drive system 100 is halted when a command is issued from the host 200 while the disk type is not determined according to the disk exchange during booting or after booting the host 200 during such a blank state. ) May occur.

In order to prevent this, conventionally, all communication with the host is performed only through the CD DSP & ATAPI i / F 40 according to the ATAPI protocol as in the signal flow of FIG. 1. That is, all commands of the host are processed by the CD DSP & ATAPI i / F 40, and when there is a request for DVD data, the microcomputer 50 sends DVD data to the DVD DSP & ATAPI i / F 41. RAM of the CD DSP & ATAPI i / F 40 through the data port provided between the CD DSP & ATAPI i / F 40 and the DVD DSP & ATAPI i / F 41 again after transmission. To be sent to. Accordingly, the CD DSP & ATAPI i / F 40 transmits the received DVD data to the host 200 according to the ATAPI protocol for processing.

However, such a conventional interface method, since a separate port for transmitting DVD data between the CD DSP & ATAPI i / F and DVD DSP & ATAPI i / F must be provided, the existing DSP & ATAPI i / F There was a problem with not using the chip.

Therefore, the present invention has been created to solve the above problems, the optical disk drive device that supports both CD (CD) and DVD (DVD), the optical disk drive device to enable a stable interface with the external host Its purpose is to provide a host interface method.

Figure 1 schematically shows the configuration of a general combo drive system connected to a personal computer (PC) by the ATAPI interface method,

FIG. 2 schematically illustrates a configuration of a combo drive system in which a host interface method of an optical disc drive device according to the present invention is implemented.

3 to 5 show a flow of a preferred embodiment of the host interface method of the optical disk drive apparatus according to the present invention.

※ Explanation of code for main part of drawing

10: optical disk 20: optical pickup

30: R / F part

40: CD Digital Signal Processing Unit (DSP) & ATAPI Interface Unit (i / F)

41: DVD Digital Signal Processing Unit (DSP) & ATAPI Interface Unit (i / F)

50: Micom 100: Combo Drive System

200: host

In the host interface method of the optical disk drive apparatus according to the present invention for achieving the above object, the first signal processing and interface means is set to an operable state, the second signal processing and interface means is initially set to an inoperative state Stage 1; A second step of interpreting a command received from an external host; As a result of the analysis, when the received command is a command for requesting data of an inserted optical disc, maintaining or changing the current setting state of the first and second signal processing and interface means according to the type of the optical disc. Third step; And a fourth step of transmitting the data of the optical disc to the host through the corresponding signal processing and interface means currently set in an operable state on the basis of the setting or maintenance of the setting state of the third step. ,

In addition, a first step of initially setting the first signal processing and interface means in an operable state and the second signal processing and interface means in an inoperable state; A second step of interpreting a command received from an external host; And a third step of performing the requested command through the first signal processing and interface means if the received command is not a command for requesting data of the inserted optical disc. There is a characteristic.

Hereinafter, a preferred embodiment of the host interface method of the optical disk drive apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 schematically illustrates the configuration of a combo drive system in which the host interface method of the optical disc driving apparatus according to the present invention is implemented. The configuration of FIG. 1 is the same as in FIG. 1, but only slightly different in signal flow.

FIG. 3 illustrates a flow of a preferred embodiment of the host interface method of the optical disk drive apparatus according to the present invention. Hereinafter, the interface method of FIG. 3 according to the present invention will be described in detail with reference to FIG.

First, both the CD DSP & ATAPI i / F 40 and the DVD DSP & ATAPI i / F 41 are connected and connected to the host 200, and the CD DSP & The ATAPI i / F 40 is in an operable state (Enable) and the DVD DSP & ATAPI i / F 41 is set in an inoperable state (Disable) (S10).

In this state, when a command is received from the host 200 (S20), the microcomputer 50 sets a busy signal (SSY), and analyzes the received command (S21). The CD DSP & ATAPI i / F 40 responds to all commands that are not data requests of the optical disc 10 (S31), releases the busy signal, and maintains the command standby state again. It is made (S32).

If the command for requesting the optical disk 10 data is received from the host 200 (S30), the microcomputer 50 performs the corresponding DSP & ATAPI according to the type of the optical disk 10 determined through a series of processes. The data transfer operation is performed by setting i / F to an operable state, that is, when the optical disc 10 is determined to be a CD (S40), the microcomputer 50 is in a current operating state, that is, the CD DSP & ATAPI i / F 40 remains enabled and DVD DSP & ATAPI i / F 41 remains disabled to transmit the requested CD data through the CD DSP & ATAPI i / F 40. This is done (S50), and the busy signal is released (S51).

However, if the optical disc 10 is determined to be a DVD, the microcomputer 50 has the DVD DSP & ATAPI i / F 41 enabled and the CD DSP & ATAPI i / F 40 Is set to the disabled state (S41), at which moment both DSP & ATAPI i / F is separated from the host 200, in this case, all of the ATAPI line is pulled high (pull up) High) state, the host 200 continues to recognize the busy state.

When the operation state is set as described above, the microcomputer 50 sets a data request (DRQ) signal, requests an interrupt so that the DVD data is transmitted to the host 200 (S42), and releases the busy signal ( S43).

In the above, since the CD DSP & ATAPI i / F 40 is already set to the enabled state by the microcomputer 50 during the optical disc 10 determination process, the command transmitted from the host 200 Receive is possible.

In addition, the above operation is performed once when the disk data is first requested, and then data transmission is continuously performed through the same DSP & ATAPI i / F until the tray is opened. .

The host interface method of the optical disk drive apparatus according to the present invention as described above is stable without operating the system (halt) without having a DSP & ATAPI i / F chip having a separate data port It is a useful invention.

Claims (8)

A first step of initially setting the first signal processing and interface means in an operable state and the second signal processing and interface means in an inoperable state; A second step of interpreting a command received from an external host; As a result of the analysis, when the received command is a command for requesting data of an inserted optical disc, maintaining or changing the current setting state of the first and second signal processing and interface means according to the type of the optical disc. Third step; And And a fourth step of transmitting the data of the optical disc to the host through the corresponding signal processing and interface means currently set in an operable state based on the setting or maintenance of the setting state of the third step. Host interface method of the device. The method of claim 1, The data transfer of the fourth step is based on ATAPI (AT Attached Packet Interface) protocol host interface method, characterized in that the drive. The method of claim 1, Wherein the first signal processing and interface means is a signal processing and interface means for a CD and the second signal processing and interface means is a signal processing and interface means for a DVD. Interface method. The method of claim 3, wherein And wherein said third step maintains the setting state of said first and second signal processing and interface means when said type of optical disc is a CD. The method of claim 3, wherein In the third step, when the type of the optical disc is a DVD, the first signal processing and interface means can be changed into an inoperable state, and the second signal processing and interface means can be changed into an operable state. Host interface method of the optical disk drive device. The method of claim 1, The second step may further include setting a busy signal upon receiving a command from the host. And the fourth step further comprises setting a data request signal after canceling the set busy signal. A first step of initially setting the first signal processing and interface means in an operable state and the second signal processing and interface means in an inoperable state; A second step of interpreting a command received from an external host; And And a third step of performing the requested command through the first signal processing and interface means if the received command is not a command for requesting data of the inserted optical disc. Host interface method. The method of claim 7, wherein The second step may further include setting a busy signal upon receiving a command from the host. The third step may further include maintaining a command reception wait state after releasing the set busy signal.