■ FIGURE 5. Element
Delimiter Cell schematic generated by
ispLEVER Schematic
Editor.
"Mismatcho"). The
symbol for Structure
and Data cells is
shown in Figure 8.
Figure 9 shows
the logic circuit of
the Tag cells. This is
the most complicated cell type in
the SCAM, since it
controls navigation
within the SCAM
and it collects the
final matching result
of the data word and
passes it on to the
next and previous
words' Tags. Input
signal "QEi" represents the "QEn" signal of the Element delimiter cell that
controls navigation in the SCAM.
"FSETo, QFo" and "BSETo, QBo" represent the propagated accumulated
state of the previous and the next Tag
cells ("QBi," "QFi") to the next and the
previous Tags respectively, upon activating the navigation signals "LNW"
and "LPW." The symbol for Tag cells is
shown in Figure 10.
Finally, we assemble the previous data word cells into a data
word, as depicted in Figure 11. It is
clear at this stage that using virtual
symbols for cell types makes it
easier to concatenate 11 cells altogether in a single schematic sheet.
Creating a symbol for the data word
(see Figure 12) is be our last step in
building schematics hierarchy. Next
month, I will demonstrate the fruitfulness of this symbol in replicating
data words to the required SCAM
capacity. NV
■ FIGURE 7. Structure and Data Cell
schematic generated by ispLEVER
Schematic Editor.
■ FIGURE 6. Element
Delimiter Cell symbol
generated by ispLEVER
Project Navigator.
■ FIGURE 8. Structure
and Data Cell symbol
generated by ispLEVER
Project Navigator.
January 2006 71
