OR3C80 datasheet(28/210 Pages) AGERE

28 / 210 page

Lucent Technologies Inc.

Data Sheet

June 1999

ORCA Series 3C and 3T FPGAs

Programmable Logic Cells (continued)

General Routing Structure

Routing resources in Series 3 FPGAs generally consist of routing segments in groups of ten, with varying lengths

and connectivity to logic and other routing resources. The varying lengths of routing segments provides a hierarchy

of routing capability from chip-length routes to routes within a PLC. The hierarchical nature of the routing provides

the

ORCA Foundry development tools with the necessary resources to route a design completely and to optimize

the routing for system speed while reducing the overall power required by the device.

Within each group of ten routing segments there is an equivalency of connectivity between pairs of segments.

These pairs are segments: [0, 4] and [1, 5] and [2, 6] and [3, 7] and [8, 9]. The equivalency in connectivity ensures

that signals on either segment in a pair have the same capability to get to a given destination. This, in turn, allows

for signal distribution from a source to varying destinations without using special routing. It also provides for routing

flexibility by ensuring that one segment position will not become so congested as to preclude routing a bus or group

of signals and allows easy connectivity from either of the twin quads in a source PFU to either of the twin quads in

any destination PFU.

Having ten segments in a group is significant in that it provides for routing a byte of data and two control signals or

parity. Due to the equivalent pairs of segments, this can also be viewed as routing two nibbles each with a control

signal. Figure 19 is an overview of the routing for a single PLC.

5-5766(F)

Figure 19. Single PLC View of Inter-PLC Route Segments

2 OF 5

LINE-BY-LINE

FINS

PFU

OUTPUT

SLIC

SWITCHING

SUR[9:0]

hxH[9:0]

hx1U[9:0]

hCK

SLL[9:0]

hx1B[9:0]

hx5[9:0]

hxL[9:0]

BR[9:0]

SUL[9:0]

BL[9:0]

SUL[9:0]

BR[9:0]

LCK

SLL[9:0]

SLR[9:0]

KEY: CONFIGURABLE SIGNAL LINE BREAKS

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