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OR2C04A

ORCA® Series 2 Field-Programmable Gate Arrays

Lattice Semiconductor 

ORCA Series 2 FPGAs

Data Sheet

January 2002

Programmable Logic Cells (continued)

J. Any five of the eight output signals can be routed out

of the PLC. The eight signals are the four LUT out-

puts (F0, F1, F2, and F3) and the four latch/FF out-

puts (Q0, Q1, Q2, and Q3). This allows the user to

access all four latch/FF outputs, read the present

state and next state of a latch/FF, build a 4-bit shift

register, etc. Each of the outputs can drive any num-

ber of the five PFU outputs. The speed of a signal

can be increased by dividing its load among multiple

PFU output drivers.

K. These lines deliver the auxiliary signals’ clock

enable and set/reset to the latches/FFs. All four of

the latches/FFs share these signals.

L. This is the clock input to the latches/FFs. Any of the

horizontal and vertical XH or XL lines can drive the

clock of the PLC latches/FFs. Long-line drivers are

provided so that a PLC can drive one XL line in the

horizontal direction and one XL line in the vertical

direction. The XL lines in each direction exhibit the

same properties as X4 lines, except there are no

CIPs. The clock lines (CKL, CKR, CKT, and CKB)

and multiplexers/drivers are used to connect to the

XL lines for low-skew, low-delay global signals.

The long lines run the length or width of the PLC

array. They rotate to allow four PLCs in one row or

column to generate four independent global signals.

These lines do not have to be used for clock routing.

Any highly used application net can use this

resource, especially one requiring low skew.

M. These lines are used to route the fast carry signal to/

from the neighboring four PLCs. The carry-out

(COUT) of the PFU can also be routed out of the

PFU onto the fifth output (O4). The carry-in (CIN)

signal can also be supplied by the B4 input to the

PFU.

N. These are the 11 logic inputs to the LUT. The A[4:0]

inputs are provided into HLUTA, and the B[4:0]

inputs are provided into HLUTB. The C0 input

bypasses the main LUT and is used in the pfumux,

pfuxor, and pfunand functions (F5M, F5X modes).

Since this input bypasses the LUT, it can be used as

a fast path around the LUT, allowing the implemen-

tation of fast, wide combinatorial functions. The C0

input can be disabled or inverted.

O. The XH lines run one-half the length (width) of the

array before being broken by a CIP.

P. The BIDIHs are used to access the XH lines.

Q. The BIDIH lines are used to connect the BIDIHs to

the XSW lines, the XH lines, or the BIDI lines.

R. These CIPs connect the BIDI lines and the BIDIH

lines.

S. These are clock lines (CKT, CKB, CKL, and CKR)

with the multiplexers and drivers to connect to the

XL lines.

T. These CIPs connect X1 lines which cross in each

corner to allow turns on the X1 lines without using

the XSW lines.

U. These CIPs connect X4 lines and xsw lines, allowing

nets that run a distance that is not divisible by four to

be routed more efficiently.

V. This routing structure allows any PFU output, includ-

ing LUT and latch/FF outputs, to be placed on O4

and be routed onto the fast carry routing.

W.This routing structure allows the fast carry routing to

be routed onto the C0 PFU input.

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