OR2C04A datasheet(34/192 Pages) ETC

34 / 192 page

Data Sheet

ORCA Series 2 FPGAs

June 1999

Lucent Technologies Inc.

Interquad Routing (continued)

Subquad Routing (OR2C40A/OR2T40A Only)

In the

ORCA OR2C40A/OR2T40A/OR2T40B, each

quadrant of the device is split into smaller arrays of

PLCs called subquads. Each of these subquads is

made of a 4 x 4 array of PLCs (for a total of 16 per sub-

quadrant), except at the outer edges of array, which

have less than 16 PLCs per subquad. New routing

resources, called subquad lines, have been added

between each adjacent pair of subquads to enhance

the routability of the device. A portion of the center of

the OR2C40A and OR2T40A array is shown in Figure

30, including the subquad blocks containing a 4 x 4

array of PLCs, the interquad routing lines, and the sub-

quad routing lines.

All of the inter-PLC routing resources discussed previ-

ously continue to be routed between a PLC and its

adjacent PLC, even if the two adjacent PLCs are in dif-

ferent subquad blocks. Since the PLC routing has not

been modified for the OR2C40A/OR2T40A architec-

tures, this means that all of the same routing connec-

tions are possible for these devices as for any other

ORCA 2C series device. In this way, both the

OR2C40A and OR2T40A/OR2T40B are upwardly com-

patible when compared with the ATT2Cxx series

devices. As the inter-PLC routing runs between sub-

quad blocks, it crosses the new subquad lines. When

this happens, CIPs are used to connect the subquad

lines to the X4 and/or the XH lines which lie along the

other axis of the PLC array.

5-4200(F).r5

Figure 30. Subquad Blocks and Subquad Routing

SUBQUAD

(4 x 4 PLCs)

SUBQUAD

(4 x 4 PLCs)

SUBQUAD

(4 x 4 PLCs)

SUBQUAD

(4 x 4 PLCs)

SUBQUAD

(4 x 4 PLCs)

SUBQUAD

(4 x 4 PLCs)

SUBQUAD

(4 x 4 PLCs)

SUBQUAD

(4 x 4 PLCs)

SUBQUAD

(4 x 4 PLCs)

SUBQUAD

(4 x 4 PLCs)

SUBQUAD

(4 x 4 PLCs)

SUBQUAD

(4 x 4 PLCs)

SUBQUAD

(4 x 4 PLCs)

SUBQUAD

(4 x 4 PLCs)

SUBQUAD

(4 x 4 PLCs)

SUBQUAD

(4 x 4 PLCs)

SEE DETAIL

IN FIGURES 25

AND 26

HORIZONTAL

INTERQUAD

ROUTING

(hIQ)

HORIZONTAL

SUBQUAD

ROUTING

(HSUB)

VERTICAL

SUBQUAD

ROUTING

(VSUB)

VERTICAL

INTERQUAD

ROUTING

(vIQ)

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