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PDF OR2C15A Data sheet ( Hoja de datos )

Número de pieza OR2C15A
Descripción Field-Programmable Gate Arrays
Fabricantes Agere Systems 
Logotipo Agere Systems Logotipo



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Data Sheet
June 1999
ORCA® Series 2
Field-Programmable Gate Arrays
Features
s High-performance, cost-effective, low-power
0.35 µm CMOS technology (OR2CxxA), 0.3 µm CMOS
technology (OR2TxxA), and 0.25 µm CMOS technology
(OR2TxxB), (four-input look-up table (LUT) delay less
than 1.0 ns with -8 speed grade)
s High density (up to 43,200 usable, logic-only gates; or
99,400 gates including RAM)
s Up to 480 user I/Os (OR2TxxA and OR2TxxB I/Os are
5 V tolerant to allow interconnection to both 3.3 V and
5 V devices, selectable on a per-pin basis)
s Four 16-bit look-up tables and four latches/flip-flops per
PFU, nibble-oriented for implementing 4-, 8-, 16-, and/or
32-bit (or wider) bus structures
s Eight 3-state buffers per PFU for on-chip bus structures
s Fast, on-chip user SRAM has features to simplify RAM
design and increase RAM speed:
— Asynchronous single port: 64 bits/PFU
— Synchronous single port: 64 bits/PFU
— Synchronous dual port: 32 bits/PFU
s Improved ability to combine PFUs to create larger RAM
structures using write-port enable and 3-state buffers
s Fast, dense multipliers can be created with the multiplier
mode (4 x 1 multiplier/PFU):
— 8 x 8 multiplier requires only 16 PFUs
— 30% increase in speed
s Flip-flop/latch options to allow programmable priority of
synchronous set/reset vs. clock enable
s Enhanced cascadable nibble-wide data path
capabilities for adders, subtractors, counters, multipliers,
and comparators including internal fast-carry operation
Table 1. ORCA Series 2 FPGAs
s Innovative, abundant, and hierarchical nibble-
oriented routing resources that allow automatic use of
internal gates for all device densities without sacrificing
performance
s Upward bit stream compatible with the ORCA ATT2Cxx/
ATT2Txx series of devices
s Pinout-compatible with new ORCA Series 3 FPGAs
s TTL or CMOS input levels programmable per pin for the
OR2CxxA (5 V) devices
s Individually programmable drive capability:
12 mA sink/6 mA source or 6 mA sink/3 mA source
s Built-in boundary scan (IEEE*1149.1 JTAG) and
3-state all I/O pins, (TS_ALL) testability functions
s Multiple configuration options, including simple, low pin-
count serial ROMs, and peripheral or JTAG modes for in-
system programming (ISP)
s Full PCI bus compliance for all devices
s Supported by industry-standard CAE tools for design
entry, synthesis, and simulation with ORCA Foundry
Development System support (for back-end implementa-
tion)
s New, added features (OR2TxxB) have:
— More I/O per package than the OR2TxxA family
— No dedicated 5 V supply (VDD5)
— Faster configuration speed (40 MHz)
— Pin selectable I/O clamping diodes provide 5V or 3.3V
PCI compliance and 5V tolerance
— Full PCI bus compliance in both 5V and 3.3V PCI sys-
tems
* IEEE is a registered trademark of The Institute of Electrical and
Electronics Engineers, Inc.
Device
OR2C04A/OR2T04A
OR2C06A/OR2T06A
OR2C08A/OR2T08A
OR2C10A/OR2T10A
OR2C12A/OR2T12A
OR2C15A/OR2T15A/OR2T15B
OR2C26A/OR2T26A
OR2C40A/OR2T40A/OR2T40B
Usable
Gates*
4,800—11,000
6,900—15,900
9,400—21,600
12,300—28,300
15,600—35,800
19,200—44,200
27,600—63,600
43,200—99,400
# LUTs Registers
400
576
784
1024
1296
1600
2304
3600
400
576
724
1024
1296
1600
2304
3600
Max User
RAM Bits
6,400
9,216
12,544
16,384
20,736
25,600
36,864
57,600
User
I/Os
160
192
224
256
288
320
384
480
Array Size
10 x 10
12 x 12
14 x 14
16 x 16
18 x 18
20 x 20
24 x 24
30 x 30
* The first number in the usable gates column assumes 48 gates per PFU (12 gates per four-input LUT/FF pair) for logic-only designs. The
second number assumes 30% of a design is RAM. PFUs used as RAM are counted at four gates per bit, with each PFU capable of
implementing a 16 x 4 RAM (or 256 gates) per PFU.

1 page




OR2C15A pdf
Data Sheet
June 1999
ORCA Series 2 FPGAs
ORCA Foundry Development System
Overview
The ORCA Foundry Development System interfaces to
front-end design entry tools and provides the tools to
produce a configured FPGA. In the design flow, the
user defines the functionality of the FPGA at two
points: at design entry and at the bit stream generation
stage.
Following design entry, the development system’s map,
place, and route tools translate the netlist into a routed
FPGA. Its bit stream generator is then used to generate
the configuration data which is loaded into the FPGA’s
internal configuration RAM. When using the bit stream
generator, the user selects options that affect the func-
tionality of the FPGA. Combined with the front-end
tools, ORCA Foundry produces configuration data that
implements the various logic and routing options dis-
cussed in this data sheet.
binatorial mode, the LUTs can realize any four-, five-,
or six-input logic functions. In ripple mode, the high-
speed carry logic is used for arithmetic functions, the
new multiplier function, or the enhanced data path
functions. In memory mode, the LUTs can be used as a
16 x 4 read/write or read-only memory (asynchronous
mode or the new synchronous mode) or a new 16 x 2
dual-port memory.
Programmable Logic Cells
The programmable logic cell (PLC) consists of a pro-
grammable function unit (PFU) and routing resources.
All PLCs in the array are identical. The PFU, which con-
tains four LUTs and four latches/FFs for logic imple-
mentation, is discussed in the next section.
Programmable Function Unit
Architecture
The ORCA Series FPGA is comprised of two basic
elements: PLCs and PICs. Figure 1 shows an array of
programmable logic cells (PLCs) surrounded by pro-
grammable input/output cells (PICs). The Series 2 has
PLCs arranged in an array of 20 rows and 20 columns.
PICs are located on all four sides of the FPGA between
the PLCs and the IC edge.
The location of a PLC is indicated by its row and col-
umn so that a PLC in the second row and third column
is R2C3. PICs are indicated similarly, with PT (top) and
PB (bottom) designating rows and PL (left) and PR
(right) designating columns, followed by a number. The
routing resources and configuration RAM are not
shown, but the interquad routing blocks (hIQ, vIQ)
present in the Series 2 series are shown.
Each PIC contains the necessary I/O buffers to inter-
face to bond pads. The PICs also contain the routing
resources needed to connect signals from the bond
pads to/from PLCs. The PICs do not contain any user-
accessible logic elements, such as flip-flops.
Combinatorial logic is done in look-up tables (LUTs)
located in the PFU. The PFU can be used in different
modes to meet different logic requirements. The LUT’s
configurable medium-/large-grain architecture can be
used to implement from one to four combinatorial logic
functions. The flexibility of the LUT to handle wide input
functions, as well as multiple smaller input functions,
maximizes the gate count/PFU.
The LUTs can be programmed to operate in one of
three modes: combinatorial, ripple, or memory. In com-
The PFUs are used for logic. Each PFU has 19 exter-
nal inputs and six outputs and can operate in several
modes. The functionality of the inputs and outputs
depends on the operating mode.
The PFU uses three input data buses (A[4:0], B[4:0],
WD[3:0]), four control inputs (C0, CK, CE, LSR), and a
carry input (CIN); the last is used for fast arithmetic
functions. There is a 5-bit output bus (O[4:0]) and a
carry-out (COUT).
PROGRAMMABLE LOGIC CELL (PLC)
WD3
WD2
WD1
WD0
A4
A3
A2
A1
A0
B4
B3
B2
B1
B0
CIN
COUT
PROGRAMMABLE
FUNCTION UNIT
(PFU)
O4
O3
O2
O1
O0
C0 CK CE LSR
(ROUTING RESOURCES, CONFIGURATION RAM)
Figure 2. PFU Ports
5-2750(F).r3
Lucent Technologies Inc.
5

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OR2C15A arduino
Data Sheet
June 1999
ORCA Series 2 FPGAs
Programmable Logic Cells (continued)
The second submode is the counter submode (see
Figure 10). The present count is supplied to input
A[3:0], and then output F[3:0] will either be incre-
mented by one for an up counter or decremented by
one for a down counter. If an up counter or down
counter is needed, the control signal to select the direc-
tion (up or down) is input on A4. Generally, the latches/
FFs in the same PFU are used to hold the present
count value.
LUT
COUT
A3
COUT
F3
QLUT3
DQ
Q3
In the third submode, multiplier submode, a single
PFU can affect a 4 x 1-bit multiply and sum with a par-
tial product (see Figure 11). The multiplier bit is input at
A4, and the multiplicand bits are input at B[3:0], where
B3 is the most significant bit (MSB). A[3:0] contains the
partial product (or other input to be summed) from a
previous stage. If A4 is logical 1, the multiplicand is
added to the partial product. If A4 is logical zero, zero is
added to the partial product, which is the same as
passing the partial product. CIN can hold the carry-in
from the less significant PFUs if the multiplicand is
wider than 4 bits, and COUT holds any carry-out from
the addition, which may then be used as part of the
product or routed to another PFU in multiplier mode for
multiplicand width expansion.
A3 B3
A2 B2
A1 B1
A0 B0
0000
A2
QLUT2 F2
DQ
Q2
10
10
10
10
A4
COUT
+
+
+
+ CIN
A1
QLUT1 F1
DQ
Q1
F3 F2 F1 F0
5-4620(F)
A0
QLUT0 F0
DQ
Q0
CIN
CIN
5-4643(F).r1
Figure 10. Counter Submode with Flip-Flops
Figure 11. Multiplier Submode
Ripple mode’s fourth submode features equality
comparators, where one 4-bit bus is input on B[3:0],
another 4-bit bus is input on B[3:0], and the carry-in is
tied to 0 inside the PFU. The carry-out (¦) signal will be
0 if A = B or will be 1 if A ¦ B. If larger than 4 bits, the
carry-out (¦) signal can be cascaded using fast-carry
logic to the carry-in of any adjacent PFU. Comparators
for greater than or equal or less than (>, =, <) continue
to be supported using the ripple mode subtractor. The
use of this submode could be shown using Figure 9
with CIN tied to 0.
Lucent Technologies Inc.
11

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