
Data Sheet
ORCA Series 2 FPGAs
June 1999
32
Lucent Technologies Inc.
Interquad Routing
In all the
ORCA Series 2 devices, the PLC array is split
into four equal quadrants. In between these quadrants,
routing has been added to route signals between the
quadrants, especially to the quadrant in the opposite
corner. The two types of interquad blocks, vertical and
horizontal, are pitch matched to PICs. Vertical inter-
quad blocks (vIQ) run between quadrants on the left
and right, while horizontal interquad blocks (hIQ) run
between top and bottom quadrants. Since hIQ and vIQ
blocks have the same logic, only the hIQ block is
described below.
The interquad routing connects XL and XH lines. It
does not affect local routing (XSW, X1, X4, fast carry),
so local routing is the same, whether PLC-PLC con-
nections cross quadrants or not. There are no connec-
tions to the local lines in the interquad blocks.
Figure 28presents a (not to scale) view of interquad routing.
Figure 28. Interquad Routing
5-4538(F)
vIQ0[4:
0
]
vIQ1[4:0
]
vIQ2[4:
0
]
vIQ3[4:0
]
5
TMID
BMID
hIQ3[4:0]
hIQ2[4:0]
hIQ1[4:0]
hIQ0[4:0]
5
SEE
DETAIL IN
FIGURE 29
RMID
LMID