[Lucent Technologies]

Description
The ORCA Series 2 series of SRAM-based FPGAs are an enhanced version of the ATT2C/2T architecture. The latest ORCA series includes patented architectural enhancements that make functions faster and easier to design while conserving the use of PLCs and routing resources.
The Series 2 devices can be used as drop-in replace ments for the ATT2Cxx/ATT2Txx series, respectively, and they are also bit stream compatible with each other. The usable gate counts associated with each series are provided in Table 1. Both series are offered in a variety of packages, speed grades, and temperature ranges.

FEATUREs
■ 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)
■ High density (up to 43,200 usable, logic-only gates; or
   99,400 gates including RAM)
■ 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)
■ 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
■ Eight 3-state buffers per PFU for on-chip bus structures
■ 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
■ Improved ability to combine PFUs to create larger RAM
   structures using write-port enable and 3-state buffers
■ 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
■ Flip-flop/latch options to allow programmable priority of
   synchronous set/reset vs. clock enable
■ Enhanced cascadable nibble-wide data path
   capabilities for adders, subtractors, counters, multipliers,
   and comparators including internal fast-carry operation
■ Innovative, abundant, and hierarchical nibbleoriented routing resources that allow automatic use of
   internal gates for all device densities without sacrificing
   performance
■ Upward bit stream compatible with the ORCA ATT2Cxx/
   ATT2Txx series of devices
■ Pinout-compatible with new ORCA Series 3 FPGAs
■ TTL or CMOS input levels programmable per pin for the
   OR2CxxA (5 V) devices
■ Individually programmable drive capability:
   12 mA sink/6 mA source or 6 mA sink/3 mA source
■ Built-in boundary scan (IEEE*1149.1 JTAG) and
   3-state all I/O pins, (TS_ALL) testability functions
■ Multiple configuration options, including simple, low pincount serial ROMs, and peripheral or JTAG modes for insystem programming (ISP)
■ Full PCI bus compliance for all devices
■ Supported by industry-standard CAE tools for design
   entry, synthesis, and simulation with ORCA Foundry
   Development System support (for back-end implementation)
■ 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 systems