Appeal No. 97-2111
Application 08/158,345
invention as recited in claim 20 as requiring anything to be done
by a Boundary-Scan master.
On the other hand, claim 20 merely recites that control
of a data and control bus is requested before a system action is
asserted. The examiner has apparently construed this language to
mean that the data and control bus is requested by the EXTEST
instruction before the EXTEST instruction is given access to this
bus. We agree with this claim construction. We also agree that
this operation is suggested by Burchard.
Burchard notes that in a circuit that meets the JTAG
standard discussed above, the “sequence of individual operations
is monitored and controlled by a bus master” [column 1, lines 16-
21]. In such a device the bus master controls access to a bus by
a plurality of devices each of which may have access to the bus.
Thus, no device in Burchard gets access to the bus in question
until it has been granted access by the bus master. Thus, when
the EXTEST instruction in Burchard indicates that the bus is
needed for a system action, the bus master must request that
control be given to the EXTEST instruction before it can execute
the system action. This operation is consistent with the
language of claim 20.
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