OR3C80 datasheet(34/210 Pages) AGERE

34 / 210 page

Lucent Technologies Inc.

Data Sheet

June 1999

ORCA Series 3C and 3T FPGAs

Programmable Logic Cells (continued)

PLC Architectural Description

Figure 21 is an architectural drawing of the PLC (as

seen in

ORCA Foundry) that reflects the PFU, the rout-

ing segments, and the CIPs. A discussion of each of

the letters in the drawing follows.

A. These are switching routing segments (xSW) that

give the router flexibility. In general switching theory,

the more levels of indirection there are in the routing,

the more routable the network is. The xSW seg-

ments can also connect to the xSW lines in adjacent

PLCs.

B. These CIPs connect the x1 routing. These are

located in the middle of the PLC to allow the block to

connect to either the left end of the horizontal x1

segment from the right or the right end of the hori-

zontal x1 segment from the left, or both. By symme-

try, the same principle is used in the vertical

direction.

C. This set of CIPs is used to connect the x1 and x5

nets to the xSW segments or to other x1 and x5

nets. The CIPs on the major diagonal allow data to

be transmitted on a bit-by-bit basis from x1 nets to

the xSW segments and between the x1 and x5 nets.

D. This structure is the supplemental logic and inter-

connect cell, or SLIC. It contains 3-statable bidirec-

tional buffers and logic for building decoders and

AND-OR-INVERT type structures.

E. These are the primary and secondary elements of

the flexible input structure or FINS. FINS is a switch

matrix that provides high connectivity while retaining

routing capability. FINS also includes feedback

paths for softwired LUT implementation.

F. This is the PFU output switch matrix. It is a complex

switch network which, like the FINS at the input, pro-

vides high connectivity and maintains routability.

G. This set of CIPs allows an xBID segment to transfer

a signal to/from xSW segments on each side. The

BIDIs can access the PFU through the xSW seg-

ments. These CIPs allow data to be routed through

the BIDIs for amplification or 3-state control and

continue to another PLC. They also provide an alter-

native routing resource to improve routability.

H. These CIPs are used to transfer data from/to the

xBID segments to/from the x1 and xL routing seg-

ments. These CIPs have been optimized to allow

the BIDI buffers to drive the loads usually seen

when using each type of routing segment.

I. Clock input to PFU.

J. These are the ten switched output routing segments

from the PFU. They connect to the PLC switching

segments and are input to the SLIC.

K. These lines deliver the auxiliary signals clock enable

(CE), local set/reset (LSR), front-end select (SEL),

add/subtract/write enable (ASWE), as well as the

carry signals (CIN and FCIN) to the latches/FFs.

L. This is the local clock buffer. Any of the horizontal

and vertical xL lines can drive the clock input of the

PLC latches/FFs. The clock routing segments

(vCLK and hCLK) and multiplexers/drivers are used

to connect to the xL routing segments for low-skew,

low-delay global signals.

M. These routing segments are used to route the fast-

carry signal to/from the neighboring four PLCs. The

carry-out (COUT) and registered carry-out (REG-

COUT) can also be routed out of the PFU.

N. This is the E2 control routing segment. It runs from

the SLIC DEC output to the FINS and also provides

connectivity to all xBID segments.

O. The xH routing segments run one-half the length

(width) of the array before being broken by a CIP.

P. These CIPs connect the xH segments to the xSW

segments.

Q.The xBID segments are used to connect the SLIC to

the xSW segments, x1 segments, x5 segments, and

xL lines, as well as providing for diagonal PLC to

PLC connections.

R. These CIPs provide connections from the xBID seg-

ments to the E1/E2 routing segments that feed PFU

control inputs CE, LSR, CIN, ASWE, SEL, and the

clock input. Alternatively, these CIPs connect the

BIDI lines to the decoder (DEC) output of the SLIC,

for routing the DEC signal.

S. These are clock spines (vCLK and hCLK) with the

multiplexers and drivers to connect to the xL routing

segments.

T. These CIPs connect xBID segments to switching

segments in diagonally and orthogonally adjacent

PFUs.

U. These CIPs connect xSW segments to the PFU out-

put segments.

V. These CIPS connect xSW segments in orthogonally

adjacent PFUs.

W.This is the SLIC 3-state control routing segment

from the FINS to the SLIC 3-state control.

X. This is the E1 control routing segment. It provides a

PFU input path from all xBID segments.

Y. These CIPs are used to select which xBID segments

are connected to the E1/E2 signal as described in

(R).

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