OR3C80 datasheet(36/210 Pages) AGERE

36 / 210 page

Lucent Technologies Inc.

Data Sheet

June 1999

ORCA Series 3C and 3T FPGAs

Programmable Input/Output Cells

The programmable input/output cells (PICs) are

located along the perimeter of the device. The PIC’s

name is represented by a two-letter designation to indi-

cate on which side of the device it is located followed by

a number to indicate in which row or column it is

located. The first letter, P, designates that the cell is a

PIC and not a PLC. The second letter indicates the side

of the array where the PIC is located. The four sides

are left (L), right (R), top (T), and bottom (B). The indi-

vidual I/O pad is indicated by a single letter (either A, B,

C, or D) placed at the end of the PIC name. As an

example, PL10A indicates a pad located on the left

side of the array in the tenth row.

Each PIC interfaces to four bond pads and contains the

necessary routing resources to provide an interface

between I/O pads and the PLCs. Each PIC is com-

posed of four programmable I/Os (PIOs) and significant

routing resources. Each PIO contains input buffers,

output buffers, routing resources, latches/FFs, and

logic and can be configured as an input, output, or

bidirectional I/O.

PICs in the Series 3 FPGAs have significant local rout-

ing resources, similar to routing in the PLCs. This new

routing increases the ability to fix user pinouts prior to

placement and routing of a design and still maintain

routability. The flexibility provided by the routing also

provides for increased signal speed due to a greater

variety of signal paths possible.

Included in the PIC routing is a fast path from the input

pins to the SLICs in each of the three adjacent PLCs

(one orthogonal and two diagonal). This feature allows

for input signals to be very quickly processed by the

SLIC decoder function and used on-chip or sent back

off of the FPGA. Also new to the Series 3 PIOs are

latches and FFs and options for using fast, dedicated

clocks called ExpressCLKs. These features will all be

discussed in subsequent sections.

A diagram of a single PIO (one of four in a PIC) is

shown in Figure 22. Table 9 provides an overview of the

programmable functions in an I/O cell.

5-5805(F).c

Figure 22. OR3C/Txxx Programmable Input/Output (PIO) Image from

ORCA Foundry

IN2

IN1

LSR

INREGMODE

LATCHFF

LATCH

NORMAL

INVERTED

RESET

SET

LEVEL MODE

TTL

CMOS

DOWN

NONE

PULL-MODE

BUFFER

FAST

SLEW

SINK

RESET

SET

LSR

OUT1

OUT2

ECLK

SCLK

CE_OVER_LSR

LSR_OVER_CE

ASYNC

LSR

ENABLE_GSR

DISABLE_GSR

OUT1OUTREG

OUT2OUTREG

OUT1OUT2

NOR

XOR

XNOR

AND

NAND

PIO LOGIC

CLKIN

PAD

ECLK

SCLK

PMUX

MODE

LSR

D0 Q

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