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PDF ( 数据手册 , 数据表 ) OR3T55

零件编号 OR3T55
描述 3C and 3T Field-Programmable Gate Arrays
制造商 Agere Systems
LOGO Agere Systems LOGO 


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OR3T55 数据手册, 描述, 功能
Data Sheet
June 1999
ORCA® Series 3C and 3T
Field-Programmable Gate Arrays
Features
s High-performance, cost-effective, 0.35 µm (OR3C) and
0.3 µm (OR3T) 4-level metal technology, (4- or 5-input
look-up table delay of 1.1 ns with -7 speed grade in
0.3 µm).
s Same basic architecture as lower-voltage, advanced
process technology Series 3 architectures. (See ORCA
Series 3L FPGA documentation.)
s Up to 186,000 usable gates.
s Up to 452 user I/Os. (OR3Txxx 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 Pin selectable I/O clamping diodes provide 5 V or 3.3 V
PCI compliance and 5 V tolerance on OR3Txxx devices.
s Twin-quad programmable function unit (PFU) architec-
ture with eight 16-bit look-up tables (LUTs) per PFU,
organized in two nibbles for use in nibble- or byte-wide
functions. Allows for mixed arithmetic and logic functions
in a single PFU.
s Nine user registers per PFU, one following each LUT,
plus one extra. All have programmable clock enable and
local set/reset, plus a global set/reset that can be dis-
abled per PFU.
s Flexible input structure (FINS) of the PFUs provides a
routability enhancement for LUTs with shared inputs and
the logic flexibility of LUTs with independent inputs.
s Fast-carry logic and routing to adjacent PFUs for nibble-,
byte-wide, or longer arithmetic functions, with the option
to register the PFU carry-out.
s Softwired LUTs (SWL) allow fast cascading of up to
three levels of LUT logic in a single PFU for up to 40%
speed improvement.
s Supplemental logic and interconnect cell (SLIC) provides
3-statable buffers, up to 10-bit decoder, and PAL*-like
AND-OR with optional INVERT in each programmable
logic cell (PLC), with over 50% speed improvement typi-
cal.
s Abundant hierarchical routing resources based on rout-
ing two data nibbles and two control lines per set provide
for faster place and route implementations and less rout-
ing delay.
s TTL or CMOS input levels programmable per pin for the
OR3Cxx (5.0 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
TS_ALL testability function to 3-state all I/O pins.
s Enhanced system clock routing for low skew, high-speed
clocks originating on-chip or at any I/O.
s Up to four ExpressCLK inputs allow extremely fast clock-
ing of signals on- and off-chip plus access to internal
general clock routing.
s StopCLK feature to glitchlessly stop/start ExpressCLKs
independently by user command.
s Programmable I/O (PIO) has:
— Fast-capture input latch and input flip-flop (FF) latch
for reduced input setup time and zero hold time.
— Capability to (de)multiplex I/O signals.
— Fast access to SLIC for decodes and PAL-like
functions.
— Output FF and two-signal function generator to
reduce CLK to output propagation delay.
— Fast open-drain dive capability
— Capability to register 3-state enable signal.
s Baseline FPGA family used in Series 3+ FPSCs (field
programmable system chips) which combine FPGA logic
and standard cell logic on one device.
* PAL is a trademark of Advanced Micro Devices, Inc.
IEEE is a registered trademark of The Institute of Electrical and
Electronics Engineers, Inc.
Table 1. ORCA Series 3 (3C and 3T) FPGAs
Device
OR3T20
OR3T30
OR3C/3T55
OR3C/3T80
OR3T125
System
Gates
36K
48K
80K
116K
186K
LUTs Registers Max User RAM User I/Os Array Size
1152
1568
2592
3872
6272
1872
2436
3780
5412
8400
18K
25K
42K
62K
100K
196 12 x 12
228 14 x 14
292 18 x 18
356 22 x 22
452 28 x 28
Process
Technology
0.3 µm/4 LM
0.3 µm/4 LM
0.3 µm/4 LM
0.3 µm/4 LM
0.3 µm/4 LM
‡ The system gate counts range from a logic-only gate count to a gate count assuming 30% of the PFUs/SLICs being used as RAMs.
The logic-only gate count includes each PFU/SLIC (counted as 108 gates per PFU/SLIC), including 12 gates per LUT/FF pair (eight per
PFU), and 12 gates per SLIC/FF pair (one per PFU). Each of the four PIOs per PIC is counted as 16 gates (two FFs, fast-capture latch,
output logic, CLK drivers, and I/O buffers). PFUs used as RAM are counted at four gates per bit, with each PFU capable of implementing
a 32 x 4 RAM (or 512 gates) per PFU.







OR3T55 pdf, 数据表
ORCA Series 3C and 3T FPGAs
Data Sheet
June 1999
Description (continued)
PIC Logic
Series 3 PIC addresses the demand for ever-increas-
ing system clock speeds. Each PIC contains four pro-
grammable inputs/outputs (PIOs) and routing
resources. On the input side, each PIO contains a fast-
capture latch that is clocked by an ExpressCLK. This
latch is followed by a latch/FF that is clocked by a sys-
tem clock from the internal general clock routing. The
combination provides for very low setup requirements
and zero hold times for signals coming on-chip. It may
also be used to demultiplex an input signal, such as a
multiplexed address/data signal, and register the sig-
nals without explicitly building a demultiplexer. Two
input signals are available to the PLC array from each
PIO, and the ORCA 2C/2T capability to use any input
pin as a clock or other global input is maintained.
On the output side of each PIO, two outputs from the
PLC array can be routed to each output flip-flop, and
logic can be associated with each I/O pad. The output
logic associated with each pad allows for multiplexing
of output signals and other functions of two output sig-
nals.
The output FF in combination with output signal multi-
plexing, is particularly useful for registering address
signals to be multiplexed with data, allowing a full clock
cycle for the data to propagate to the output. The I/O
buffer associated with each pad is very similar to the
ORCA 2C/2T Series buffer with a new, fast, open-drain
option for ease of use on system buses.
System Features
Series 3 also provides system-level functionality by
means of its dual-use microprocessor interface and its
innovative programmable clock manager. These func-
tional blocks allow for easy glueless system interfacing
and the capability to adjust to varying conditions in
today’s high-speed systems.
Routing
The abundant routing resources of the ORCA Series 3
FPGAs are organized to route signals individually or as
buses with related control signals. Clocks are routed on
a low-skew, high-speed distribution network and may
be sourced from PLC logic, externally from any I/O
pad, or from the very fast ExpressCLK pins. Express-
CLKs may be glitchlessly and independently enabled
and disabled with a programmable control signal using
the new StopCLK feature. The improved PIC routing
resources are now similar to the patented intra-PLC
routing resources and provide great flexibility in moving
signals to and from the PIOs. This flexibility translates
into an improved capability to route designs at the
required speeds when the I/O signals have been locked
to specific pins.
Configuration
The FPGA’s functionality is determined by internal
configuration RAM. The FPGA’s internal initialization/
configuration circuitry loads the configuration data at
powerup or under system control. The RAM is loaded
by using one of several configuration modes. The con-
figuration data resides externally in an EEPROM or any
other storage media. Serial EEPROMs provide a sim-
ple, low pin count method for configuring FPGAs. A
new, easy method for configuring the devices is
through the microprocessor interface.
8 Lucent Technologies Inc.







OR3T55 equivalent, schematic
ORCA Series 3C and 3T FPGAs
Data Sheet
June 1999
Programmable Logic Cells (continued)
Half-Logic Mode
Series 3 FPGAs are based upon a twin-quad architec-
ture in the PFUs. The byte-wide nature (eight LUTs,
eight latches/FFs) may just as easily be viewed as two
nibbles (two sets of four LUTs, four latches/FFs). The
two nibbles of the PFU are organized so that any nib-
ble-wide feature (excluding some softwired LUT topolo-
gies) can be swapped with any other nibble-wide
feature in another PFU. This provides for very flexible
use of logic and for extremely flexible routing. The half-
logic mode of the PFU takes advantage of the twin-
quad architecture and allows half of a PFU, K[7:4] and
associated latches/FFs, to be used in logic mode while
the other half of the PFU, K[3:0] and associated latches/
FFs, is used in ripple mode. In half-logic mode, the
ninth FF may be used as a general-purpose FF or as a
register in the ripple mode carry chain.
with half-logic ripple connections shown as dashed
lines.
The result output and ripple output are calculated by
using generate/propagate circuitry. In ripple mode, the
two operands are input into KZ[1] and KZ[0] of each
LUT. The result bits, one per LUT, are F[7:0]/F[3:0] (see
Figure 6). The ripple output from LUT K7/K3 can be
routed on dedicated carry circuitry into any of four adja-
cent PLCs, and it can be placed on the PFU COUT/
FCOUT outputs. This allows the PLCs to be cascaded
in the ripple mode so that nibble-wide ripple functions
can be expanded easily to any length.
Result outputs and the carry-out may optionally be reg-
istered within the PFU. The capability to register the
ripple results, including the carry output, provides for
improved counter performance and simplified pipelin-
ing in arithmetic functions.
Ripple Mode
The PFU LUTs can be combined to do byte-wide ripple
functions with high-speed carry logic. Each LUT has a
dedicated carry-out net to route the carry to/from any
adjacent LUT. Using the internal carry circuits, fast
arithmetic, counter, and comparison functions can be
implemented in one PFU. Similarly, each PFU has
carry-in (CIN, FCIN) and carry-out (COUT, FCOUT)
ports for fast-carry routing between adjacent PFUs.
The ripple mode is generally used in operations on two
data buses. A single PFU can support an 8-bit ripple
function. Data buses of 4 bits and less can use the
nibble-wide ripple chain that is available in half-logic
mode. This nibble-wide ripple chain is also useful for
longer ripple chains where the length modulo 8 is four
or less. For example, a 12-bit adder (12 modulo 8 = 4)
can be implemented in one PFU in ripple mode (8 bits)
and one PFU in half-logic mode (4 bits), freeing half of
a PFU for general logic mode functions.
Each LUT has two operands and a ripple (generally
carry) input, and provides a result and ripple (generally
carry) output. A single bit is rippled from the previous
LUT and is used as input into the current LUT. For LUT
K0, the ripple input is from the PFU CIN or FCIN port.
The CIN/FCIN data can come from either the fast-carry
routing (FCIN) or the PFU input (CIN), or it can be tied
to logic 1 or logic 0.
In the following discussions, the notations LUT K7/K3
and F[7:0]/F[3:0] are used to denote the LUT that pro-
vides the carry-out and the data outputs for full PFU
ripple operation (K7, F[7:0]) and half-logic ripple
operation (K3, F[3:0]), respectively. The ripple mode
diagram in Figure 6 shows full PFU ripple operation,
16
K7[1]
K7[0]
K6[1]
K6[0]
K5[1]
K5[0]
K4[1]
K4[0]
K3[1]
K3[0]
K2[1]
K2[0]
K1[1]
K1[0]
K0[1]
K0[0]
CIN/FCIN
C DQ
C
K7 D Q
K6 D Q
K5 D Q
K4 D Q
K3 D Q
K2 D Q
K1 D Q
K0 D Q
REGCOUT
FCOUT
COUT
F7
Q7
F6
Q6
F5
Q5
F4
Q4
F3
Q3
F2
Q2
F1
Q1
F0
Q0
Figure 6. Ripple Mode
5-5755(F)
Lucent Technologies Inc.










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