
ORCA
Series 2
Field-Programmable Gate Arrays
Data Sheet
June 1999
Features
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 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)
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 High density (up to 43,200 usable, logic-only gates; or 
99,400 gates including RAM)
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 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)
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 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
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 Eight 3-state buffers per PFU for on-chip bus structures
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 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 
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 Improved ability to combine PFUs to create larger RAM 
structures using write-port enable and 3-state buffers
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 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
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 Flip-flop/latch options to allow programmable priority of 
synchronous set/reset vs. clock enable
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 Enhanced
cascadable
nibble-wide data path 
capabilities for adders, subtractors, counters, multipliers, 
and comparators including internal fast-carry operation
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 Innovative, abundant, and hierarchical nibble-
oriented routing resources that allow automatic use of 
internal gates for all device densities without sacrificing 
performance
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 Upward bit stream compatible with the ORCA ATT2Cxx/
ATT2Txx series of devices
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 Pinout-compatible with new ORCASeries 3 FPGAs
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 TTL or CMOS input levels programmable per pin for the 
OR2CxxA (5 V) devices
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12 mA sink/6 mA source or 6 mA sink/3 mA source
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 Built-in boundary scan (IEEE*1149.1 JTAG) and 
3-state all I/O pins, (TS_ALL) testability functions
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 Multiple configuration options, including simple, low pin-
count serial ROMs, and peripheral or JTAG modes for in-
system programming (ISP)
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 Full PCI bus compliance for all devices
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 Supported by industry-standard CAE tools for design 
entry, synthesis, and simulation with ORCAFoundry 
Development System support (for back-end implementa-
tion)
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 New, added features (OR2TxxB) have:
— More I/O per package than the OR2TxxA family
— No dedicated 5 V supply (V
DD
5)
— 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.
Table 1. ORCA Series 2 FPGAs
* 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.
Device
Usable
Gates*
# LUTs
Registers
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
OR2C04A/OR2T04A
OR2C06A/OR2T06A
OR2C08A/OR2T08A
OR2C10A/OR2T10A
OR2C12A/OR2T12A
OR2C15A/OR2T15A/OR2T15B
OR2C26A/OR2T26A
OR2C40A/OR2T40A/OR2T40B
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
400
576
784
1024
1296
1600
2304
3600
400
576
724
1024
1296
1600
2304
3600
10 x 10
12 x 12
14 x 14
16 x 16
18 x 18
20 x 20
24 x 24
30 x 30