Method and apparatus for detecting a presence of a device

1. A method for detecting a presence of a device, the method comprising:

providing a clock driver having a pair of differential clock signal lines capable of connection to a device, wherein one signal line of the pair of signal lines carries a clock signal, while the other wire carries the inverse of the signal;

providing a presence detection signal for transmission through the pair of differential clock signal lines;

determining whether the presence detection signal is received through the pair of differential clock signal lines;

identifying the absence of the device if no presence detection signal is received through the pair of differential clock signal lines, further comprising;

enabling the presence detection signal on one of the differential clock signal lines when the absence of the device is identified; and

disabling the differential clock signals through the differential clock signal lines when the absence of the device is identified;

identifying the presence of the device if the presence detection signal is received through the pair of differential clock signal lines, further comprising:

enabling differential clock signals through the pair of differential clock signal lines when the presence of the device is identified; and

disabling the presence detection signal through the pair of differential clock signal lines when the presence of the device is identified; and

notifying a system management module of the presence of the device.

2. A system for detecting a presence of a device, the system comprising:

means for providing a clock driver having a pair of differential clock signal lines capable of connection to a device;

means for providing a presence detection signal for transmission through the pair of differential clock signal lines;

means for identifying the absence of the device if no presence detection signal is received through the pair of differential clock signal lines;

means for determining whether the presence detection signal is received through the pair of differential clock signal lines, further comprising:

means for disabling the presence detection signal through the pair of differential clock signal lines when the presence of the device is identified; and

means for enabling differential clock signals through the pair of differential clock signal lines when the presence of the device is identified; and

means for identifying the presence of the device if the presence detection signal is received through the pair of differential clock signal lines.

3. A clock driver having device presence detection capabilities, the clock driver comprising:

a pair of differential clock signal lines capable of connection to a device;

a presence detection signal line that provides a presence detection signal for transmission through the pair of differential clock signal lines;

a control module that identifies the presence of the device when a presence detection signal is received through the pair of differential clock signal lines;

a control module identifies the absence of the device when no presence detection signal is received through the pair of differential clock signal lines;

a switching circuit that enables the presence detection signal on one of the differential clock signal lines when the control module identifies the absence of the device;

a switching circuit that disables the differential clock signals through the differential clock signal lines when the control module identifies the absence of the device;

a switching circuit that disables the presence detection signal through the pair of differential clock signal lines when the control module identifies the presence of the device;

a switching circuit that enables differential clock signals through the pair of differential clock signal lines when the control module identifies the presence of the device; and

a control module that notifies a system management module of the presence of the device.