OR3C55-5BA352I datasheet(29/210 Pages) AGERE

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Lucent Technologies Inc.

Data Sheet

June 1999

ORCA Series 3C and 3T FPGAs

Programmable Logic Cells (continued)

Intra-PLC Routing

The function of the intra-PLC routing resources is to

connect the PFU’s input and output ports to the routing

resources used for entry to and exit from the PLC. This

routing provides PFU feedback, corner turning, or

switching from one type of routing resource to another.

Flexible Input Structure (FINS)

The flexible input switching structure (FINS) in each

PLC of the

ORCA Series 3 provides for the flexibility of

a crossbar switch from the routing resources to the

PFU inputs while taking advantage of the routability of

shared inputs. Connectivity between the PLC routing

resources and the PFU inputs is provided in two

stages. The primary FINS switch has 50 inputs that

connect the PLC routing to the 35 inputs on the sec-

ondary switch. The outputs of the second switch con-

nect to the 50 PFU inputs. The switches are

implemented to provide connectivity for bused signals

and individual connections.

PFU Output Switching

The PFU outputs are switched onto PLC routing

resources via the PFU output multiplexer (OMUX). The

PFU output switching segments from the output multi-

plexer provide ten connections to the PLC routing out

of 18 possible PFU outputs (F[7:0], Q[7:0], DOUT,

REGCOUT). These output switching segments con-

nect segment for segment to the SUR, SUL, SLR, and

SLL switching segments described below (e.g., O4

connects only to SUR4, not SUR5). The output switch-

ing segments also feed directly into the SLIC on a seg-

ment-by-segment basis. This connectivity is also

described below.

Switching Routing Segments (xSW)

There are four sets of switching routing segments in

each PLC. Each set consists of ten switching elements:

SUL[9:0], SUR[9:0], SLL[9:0], and SLR[9:0], tradition-

ally labeled for the upper-left, upper-right, lower-left,

and lower-right sections of the PFUs, respectively. The

xSW routing segments connect to the PFU inputs and

outputs as well as the BIDI routing segments, to be

described later. They also connect to both the horizon-

tal and vertical x1 and x5 routing segments (inter-PLC

routing resources, described later) in their specific cor-

ner. xSW segments can be used for fast connections

between adjacent PLCs or PICs without requiring the

use of inter-PLC routing resources. This capability not

only increases signal speed on adjacent PLC routing,

but also reduces routing congestion on the principal

inter-PLC routing resources. The SLL and SUR seg-

ments combine to provide connectivity to the PLCs to

the left and right of the current PLC; the SLR and SUL

segments combine to provide connectivity to the PLCs

above and below the current PLC.

Fast routes on switching segments to diagonally adja-

cent PLCs/PICs are possible using the BIDI routing

segments (discussed below) and the SLL and SLR

switching segments. The BR BIDI routing segments

combine with the SUL switching segments of the PLC

below and to the right of the current PLC to connect to

that PLC. The BL BIDI routing segments combine with

the SLL switching segments of the PLC above and to

the right of the current PLC to connect to that PLC.

These fast diagonal connections provide a great

amount of flexibility in routing congested areas of logic

and in shifting data on a per-PLC basis such as per-

forming implicit multiplications/divisions in routing

between functional logic elements.

Switching routing segments are also the chief means

by which signals are transferred between the inter-PLC

routing resources and the PFU. Each set of switching

segments has connectivity to the x1 routing segments,

and there is varying connectivity to the x5, xH, and xL

inter-PLC routing segments. Detailed information on

switching segment/inter-PLC routing connectivity is

provided later in this section in the Inter-PLC Routing

Resources subsection.

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