OR3C80 datasheet(31/210 Pages) AGERE

31 / 210 page

Lucent Technologies Inc.

Data Sheet

June 1999

ORCA Series 3C and 3T FPGAs

Programmable Logic Cells (continued)

Inter-PLC Routing Resources

The inter-PLC routing is used to route signals between

PLCs. The routing segments occur in groups of ten,

and differ in the numbers of PLCs spanned. The x1

routing segments span one PLC, the x5 routing seg-

ments span five PLCs, the xH routing segments span

one-half the width (height) of the PLC array, and the xL

routing segments span the width (height) of the PLC

array. All types of routing segments run in both horizon-

tal and vertical directions.

Table 8 shows the groups of inter-PLC routing seg-

ments in each PLC. In the table, there are two rows/col-

umns for x1 lines. They are differentiated by a T for top,

B for bottom, L for left, and R for right. In the

ORCA

Foundry design editor representation, the horizontal x1

routing segments are located above and below the

PFU. The two groups of vertical segments are located

on the left side of the PFU. The xL and x5 routing seg-

ments only run below and to the left of the PFU, while

the xH segments only run above and to the right of the

PFU. The indexes specify individual routing segments

within a group. For example, the vx5[2] segment runs

vertically to the left of the PFU, spans five PLCs, and is

the third line in the 10-bit wide group.

PLCs are arranged like tiles on the

ORCA device.

Breaks in routing occur at the middle of the tile (e.g., x1

lines break in the middle of each PLC) and run across

tiles until the next break.

Figure 20 provides a global view of inter-PLC routing

resources across multiple PLCs.

x1 Routing Segments. There are a total of 40 x1 rout-

ing segments per PLC: 20 vertical and 20 horizontal.

Each of these are subdivided into two, 10-bit wide

buses: hx1T[9:0], hx1B[9:0], vx1L[9:0], and vx1R[9:0].

An x1 segment is one PLC long. If a signal net is longer

than one PLC, an x1 segment can be lengthened to n

times its length by turning on n – 1 CIPs. A signal is

routed onto an x1 route segment via the switching rout-

ing segments or BIDI routing segments which also

allows the x1 route segment to be connected to other

inter-PLC segments of different lengths. Corner turning

between x1 segments is provided through direct con-

nections, xSW segments, and xBID segments.

x5 Routing Segments. There are two sets of ten x5

routing segments per PLC. One set (vx5[9:0]) runs ver-

tically, and the other (hx5[9:0]) runs horizontally. Each

x5 segment traverses five PLCs before it is broken by a

CIP. Two x5 segments in each group break in each

PLC. The two that break are in an equivalent pair; for

example, x5[0] and x5[4]. The x5 segments that break

shift by one at the next PLC. For example, if hx5[0] and

hx5[4] are broken at the current PLC, hx5[1] and hx5[5]

will be broken at the PLC to the right of the current

PLC. There are direct connections to the BIDI routing

segments in the PLC at which the x5 segments break,

on both sides of the break. Signal corner turning is

enabled by CIPs in each PLC that allow the broken x5

segments to directly connect to the broken x5 seg-

ments that run in the orthogonal direction. x5 corner

turning can also be accomplished via the xSW and

xBID segments in a PLC. In addition, the x5 segments

are connected to the FINS and PFU outputs on a bit-

by-bit basis by the xSW segments. x5 segments can be

connected for signal runs in multiples of five PLCs, or

they can be combined with x1 and xH routing segments

for runs of varying distances.

Table 8. Inter-PLC Routing Resources

Horizontal

Routing

Segments

Vertical

Routing

Segments

Distance

Spanned

hx1U[9:0]

vx1R[9:0]

One PLC

hx1B[9:0]

vx1L[9:0]

One PLC

hx5[9:0]

vx5[9:0]

Five PLCs

hx5[9:0]

vx5[9:0]

Five PLCs

hxL[9:0]

vxL[9:0]

PLC Array

hxH[9:0]

vxH[9:0]

1/2 PLC Array

hCLK

vCLK

PLC Array

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