Appeal No. 2004-1676
Application 09/263,918
segmentation and reassembly. Although not clearly described in
Kwak, Fig. 5a shows the steps performed by the CPU to perform
segmentation using AAL1, to store the ATM cells in the double
port RAM if it is not being used by the SSID, and to store the
ATM cells in system memory if it is being used and later storing
the ATM cells in the double port RAM; Fig. 5b shows the steps
performed by the SSID to transmit ATM cells in the double port
RAM to the physical layer; Fig. 5c shows the steps performed by
the SSID to transfer ATM cells from the physical layer to the
double port RAM; and Fig. 5d shows the steps performed by the CPU
to perform reassembly on ATM cells in the double port RAM and
output the data (col. 4, lines 43-62). The CPU acts on data in
the system memory to perform segmentation (Figs. 4 and 5a) and
reassembly (Fig. 5d) functions; the SSID only transfers data to
and from the double port RAM. The CPU inherently processes
software instructions in system memory to perform the SAR
functions, and any group of software instructions for performing
a function can be considered a "module." For these reasons, we
find that Kwak discloses "performing asynchronous transfer mode
(ATM) segmentation functions with a segmentation and reassembly
(SAR) software module implemented in a central processing unit
(CPU)."
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