External electronic device and interface controller and external electronic device control method
An interface controller, coupling a device main body of an external electronic device to a host, is disclosed, which transmits a termination-on signal to the host prior to a mechanically stable state of a device main body of the external electronic device. When the device main body has not reached the mechanically stable state yet, the interface controller responds to the host with default link information in a delayed manner. The default link information is contained in the interface controller. When the device main body reaches the mechanically stable state, the interface controller transmits specific link information retrieved from the device main body to the host.
1. An external electronic device, comprising: a device main body; and
an interface controller, coupling the device main body to a host and containing default link information, wherein:
the interface controller transmits a termination-on signal to the host prior to the device main body reaches a mechanically stable state;
the interface controller transmits the default link information to the host in a delayed manner to respond to the host when the device main body has not reached the mechanically stable state yet; and
when the device main body is in the mechanically stable state, the interface controller transmits specific link information retrieved from the device main body to respond to the host;
the interface controller plans a buffer time period based on a stabilization time required for the device main body, the device main body takes the stabilization time from starting UP to the mechanically stable state; and
during the buffer time period, the interface controller transmits the default link information to the host in the delayed manner.
2. The external electronic device as claimed in claim 1 , wherein:
the interface controller transmits the termination-on signal to the host when the host wakes up from a sleep mode.
3. The external electronic device as claimed in claim 1 , wherein:
the interface controller transmits the default link information to the host in the delayed manner to respond to default link information get requests that the host issues based on the termination-on signal.
4. The external electronic device as claimed in claim 1 , wherein:
when the device main body has not reached the mechanically stable state yet, the interface controller delays to acknowledge the reception of default link information get requests that the host issues.
5. The external electronic device as claimed in claim 1 , wherein:
the default link information contained in the interface controller includes but not limited to a device descriptor, a configuration descriptor and a Binary Device Object Store type descriptor; and
the interface controller respectively transmits the device descriptor, the configuration descriptor and the Binary Device Object Store type descriptor contained in the interface controller to the host in the delayed manner to respond to a device descriptor get request, a configuration descriptor get request and a Binary Device Object Store type descriptor get request issued from the host.
6. The external electronic device as claimed in claim 1 , wherein:
the specific link information includes but not limited to a device string descriptor; and
the interface controller transmits the device string descriptor retrieved from the device main body to the host to respond to a device string descriptor get request issued from the host.
7. The external electronic device as claimed in claim 1 , wherein the device main body is a hard disc.
8. The external electronic device as claimed in claim 1 , wherein:
the device main body communicates with the interface controller through a Serial Advanced Technology Attachment interface, and the interface controller communicates with the host through a Universal Serial Bus interface.
9. An interface controller, coupling a device main body to a host, comprising:
a memory, stored with program codes and containing default link information; and a computing unit executing the program codes to transmit a termination-on signal to the host prior to the device main body reaches a mechanically stable state, wherein:
according to the computing unit, the default link information contained in the memory is transmitted to the host in a delayed manner to respond to the host when the device main body has not reached the mechanically stable state yet; and
according to the computing unit, specific link information retrieved from the device main body is transmitted to respond to the host when the device main body is in the mechanically stable state;
the interface controller plans a buffer time period based on a stabilization time required for the device main body, the device main body takes the stabilization time from starting UP to the mechanically stable state; and
during the buffer time period, the interface controller transmits the default link information to the host in the delayed manner.
10. The interface controller as claimed in claim 9 , wherein:
the default link information contained in the memory includes but not limited to a device descriptor, a configuration descriptor and a Binary Device Object Store type descriptor; and
the interface controller respectively transmits the device descriptor, the configuration descriptor and the Binary Device Object Store type descriptor contained in the memory to the host in the delayed manner to respond to a device descriptor get request, a configuration descriptor get request and a Binary Device Object Store type descriptor get request issued from the host.
11. The interface controller as claimed in claim 9 , wherein:
the specific link information includes but not limited to a device string descriptor; and
the interface controller transmits the device string descriptor retrieved from the device main body to the host to respond to a device string descriptor get request issued from the host.
12. The interface controller as claimed in claim 9 , wherein:
the interface controller communicates with the device main body through a Serial Advanced Technology Attachment interface; and
the interface controller communicates with the host through a Universal Serial Bus interface.
13. An external electronic device control method, comprising: transmitting a termination-on signal to a host coupled to an external electronic device when the external electronic device is powered on;
receiving default link information get requests that the host issues based on the termination-on signal;
responding to the default link information get requests in a delayed manner when a device main body of the external electronic device has not reached a mechanically stable state yet; and
transmitting specific link information retrieved from the device main body to respond to the host when the device main body is in the mechanically stable state;
wherein:
a buffer time period based on a stabilization time required for the device main body is planned, the device main body takes the stabilization time from starting up to the mechanically stable state; and
during the buffer time period, the default link information get requests are responded to in the delayed manner.
14. The external electronic device control method as claimed in claim 13 , further comprising:
transmitting the termination-on signal to the host when the host wakes up from a sleep mode.
15. The external electronic device control method as claimed in claim 13 , wherein:
when the device main body has not reached the mechanically stable state yet, it is delayed to acknowledge the reception of the default link information get requests.
16. The external electronic device control method as claimed in claim 13 , wherein the step of responding to the default link information get requests further comprising:
transmitting default link information contained in an interface controller coupled between the device main body and the host to the host in a delayed manner when the device main body has not reached the mechanically stable state yet.
17. The external electronic device control method as claimed in claim 13 , wherein:
the default link information get requests request for a device descriptor, a configuration descriptor and a Binary Device Object Store type descriptor contained in an interface controller coupled between the device main body and the host; and
the device descriptor, the configuration descriptor and the Binary Device Object Store type descriptor are respectively transmitted to the host in the delayed manner to respond to a device descriptor get request, a configuration descriptor get request and a Binary Device Object Store type descriptor get request issued from the host.
18. The external electronic device control method as claimed in claim 13 , wherein:
the specific link information includes but not limited to a device string descriptor; and
the device string descriptor retrieved from the device main body is transmitted to the host to respond to a device string descriptor get request issued from the host.