Appeal No. 2006-1204
Application No. 10/379,006
(255) confirming whether or not an actual impedance mismatch does
exist. See also figure 4, item 420. Upon a determination that
no impedance mismatch exists, no calibration is done. See also
figure 4, item 430. In the event that an impedance mismatch is
found to exist, the controller (230) issues a command to an
arbiter (235) to select a new impedance for the driver circuit
(225). See also figure 4, item 440. Depending on the state of
the driver circuit (225), the arbiter (235) decides to either
transmit the command to the driver circuit (225) or to return the
command to the controller (230) for storage in the register
(255). See also figure 4, items 450, 460, 470 and 480.
Claim 13 is representative of the claimed invention and is
reproduced as follows:
13. An apparatus, comprising:
a driver circuit having a first plurality of impedances;
a load coupled to the driver circuit;
a synchronous circuit capable of providing a signal
indicative of an impedance mismatch between the driver circuit
and the load; and
a controller for selecting one of the first plurality of
impedances to reduce the impedance mismatch in response to the
signal.
3
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