OR2C04A datasheet(35/192 Pages) ETC

35 / 192 page

Lucent Technologies Inc.

Data Sheet

June 1999

ORCA Series 2 FPGAs

Interquad Routing (continued)

5-4201(F).r4

Figure 31. Horizontal Subquad Routing

Connectivity

The X4 and XH lines make the only connections to the

subquad lines; therefore, the array remains symmetri-

cal and homogeneous. Since each subquad is made

from a 4 x 4 array of PLCs, the distance between sets

of subquad lines is four PLCs, which is also the dis-

tance between the breaks of the X4 lines. Therefore,

each X4 line will cross exactly one set of subquad lines.

Since all X4 lines make the same connections to the

subquad lines that they cross, all X4 lines in the array

have the same connectivity, and the symmetry of the

routing is preserved. Since all XH lines cross the same

number of subquad blocks, the symmetry is maintained

for the XH lines as well.

The new subquad lines travel a length of eight PLCs

(seven PLCs on the outside edge) before they are bro-

ken. Unlike other inter-PLC lines, they cannot be con-

nected end-to-end. As shown in Figure 30, some of the

horizontal (vertical) subquad lines have connectivity to

the subquad to the left of (above) the current subquad,

while others have connectivity to the subquad to the

right (below). This allows connections to/from the cur-

rent subquad from/to the PLCs in all subquads that sur-

round it.

Between all subquads, including in the center of the

array, there are three groups of subquad lines where

each group contains four lines. Figure 31 shows the

connectivity of these three groups of subquad lines

(HSUB) to the VX4 and VXH lines running between a

vertical pair of PLCs. Between each vertical pair of

subquad blocks, four of the blocks shown in Figure 31

are used, one for each pair of vertical PLCs.

The first two groups, depicted as A and B, have con-

nectivity to only one of the two sets of X4 lines between

pairs of PLCs. Since they are very lightly loaded, they

are very fast. The third group, C, connects to both

groups of X4 lines between pairs of PLCs, as well as all

of the XH lines between pairs of PLCs, providing high

flexibility. The connectivity for the vertical subquad rout-

ing (Vsub) is the same as described above for the hori-

zontal subquad routing, when rotated onto the other

axis.

At the center row and column of each quadrant, a

fourth group of subquad lines has been added. These

subquad lines only have connectivity to the XH lines.

The XH lines are also broken at this point, which

means that each XH line travels one-half of the quad-

rant (i.e., one-quarter of the device) before it is broken

by a CIP. Since the XH lines can be connected end-to-

end, the resulting line can be either one-quarter, one-

half, three-quarters, or the entire length of the array.

The connectivity of the XH lines and this fourth group of

subquad lines, indicated as D, are detailed in Figure

32. Again, the connectivity for the vertical subquad

routing (VSUB) is the same as the horizontal subquad

routing, when rotated onto the other axis.

5-4202(F).r3

Figure 32. Horizontal Subquad Routing

Connectivity (Half Quad)

HSUB[11]

HSUB[10]

HSUB[9]

HSUB[8]

HSUB[7]

HSUB[6]

HSUB[5]

HSUB[4]

HSUB[3]

HSUB[2]

HSUB[1]

HSUB[0]

HSUB[11]

HSUB[10]

HSUB[9]

HSUB[8]

HSUB[7]

HSUB[6]

HSUB[5]

HSUB[4]

HSUB[3]

HSUB[2]

HSUB[1]

HSUB[0]

HSUB[11]

HSUB[10]

HSUB[9]

HSUB[8]

HSUB[15]

HSUB[14]

HSUB[13]

HSUB[12]

HSUB[3]

HSUB[2]

HSUB[1]

HSUB[0]

HSUB[11]

HSUB[10]

HSUB[9]

HSUB[8]

HSUB[15]

HSUB[14]

HSUB[13]

HSUB[12]

HSUB[3]

HSUB[2]

HSUB[1]

HSUB[0]

HSUB[7]

HSUB[6]

HSUB[5]

HSUB[4]

HSUB[7]

HSUB[6]

HSUB[5]

HSUB[4]

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