Appeal No. 2006-1204
Application No. 10/379,006
At page 15, lines 5-16, Appellants’ specification states:
The package 200 typically includes the synchronous
circuit 260 to synchronize one or more internal clock
signals to an external clock signal. The internal
clock signals may, in various alternative embodiments,
be clock signals used by the internal circuitry 205,
the arbiters 235, the driver circuits 225, and any
other desirable circuitry in the package 200. For
example, the synchronous circuit 260 may provide a
synchronized clock signal 265 to the internal circuit
205. Examples of the synchronous circuit 260 include,
but are not limited to delay-locked loops, phase-locked
loops, and synchronous mirror delays. The synchronous
circuit 260 monitors a phase difference between the one
or more internal clock signals and the external clock
signal and provides one or more adjustment signals in
response to detecting the phase difference. In one
embodiment, the synchronous circuit 260 may provide a
fine adjustment signal in response to detecting small
phase differences and a coarse adjustment signal in
response to detecting large phase differences.
Further, at page 16, lines 5-17, Appellants’ specification
states:
Referring now to Figure 4, a flow chart illustrating one
embodiment of a process of calibrating the driver circuits
225 is shown. In the illustrated process, a phase
difference that may be indicative of an impedance mismatch
is detected (at 400) by a synchronous circuit 260, which
provides (at 410) the update signal 270 to the controller
230 in response to detecting (at 400) the phase difference.
In response to the update signal 270, the controller 230
determines (at 420) whether an impedance mismatch may be
present. If the controller 230 determines (at 420) that no
mismatch is present, or that the impedance mismatch is small
enough that it is not desirable to change the impedance of
the driver circuit 225, the process ends (at 430). If the
controller 230 determines (at 420) that the impedance
mismatch is greater than a predetermined range of tolerance
values, a determination may be made that it is desirable to
change the impedance of the driver circuit 225 to reduce the
impedance mismatch. The controller 230 then selects (at
440) one or more new impedances for the driver circuits 225.
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