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OR2C04A

ORCA® Series 2 Field-Programmable Gate Arrays

Lattice Semiconductor 

ORCA Series 2 FPGAs

Data Sheet

January 2002

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 28

presents a (not to scale) view of interquad routing.

TMID

555 5

SEE

DETAIL IN

FIGURE 29

LMID

5

hIQ3[4:0]

5

hIQ2[4:0]

5

hIQ1[4:0]

5

hIQ0[4:0]

RMID

BMID

Figure 28. Interquad Routing

5-4538(F)

32

Lattice Semiconductor

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