Description
FPGA Overview
The ORCA Series 3 FPGAs are a new generation of SRAM-based FPGAs built on the successful OR2C/TxxA FPGA Series from Lucent Technologies Microelectronics Group, with enhancements and innovations geared toward today’s high-speed designs and tomorrow’s systems on a single chip. Designed from the start to be synthesis friendly and to reduce place and route times while maintaining the complete routability of the ORCA 2C/2T devices, Series 3 more than doubles the logic available in each logic block and incorporates system-level features that can further reduce logic requirements and increase system speed. ORCA Series 3 devices contain many new patented enhancements and are offered in a variety of packages, speed grades, and temperature ranges.

Features
■ 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).
■ Same basic architecture as lower-voltage, advanced process technology Series 3 architectures. (See ORCA Series 3L FPGA documentation.)
■ Up to 186,000 usable gates.
■ 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.)
■ Pin selectable I/O clamping diodes provide 5 V or 3.3 V PCI compliance and 5 V tolerance on OR3Txxx devices.
■ Twin-quad programmable function unit (PFU) architecture 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.
■ 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 disabled per PFU.
■ 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.
■ 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.
■ Softwired LUTs (SWL) allow fast cascading of up to three levels of LUT logic in a single PFU for up to 40% speed improvement.
■ 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 typical.
■ Abundant hierarchical routing resources based on routing two data nibbles and two control lines per set provide for faster place and route implementations and less routing delay.
■ TTL or CMOS input levels programmable per pin for the OR3Cxx (5.0 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 TS_ALL testability function to 3-state all I/O pins.
■ Enhanced system clock routing for low skew, high-speed clocks originating on-chip or at any I/O.
■ Up to four ExpressCLK inputs allow extremely fast clocking of signals on- and off-chip plus access to internal general clock routing.
■ StopCLK feature to glitchlessly stop/start ExpressCLKs independently by user command.
■ 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.
■ Baseline FPGA family used in Series 3+ FPSCs (field programmable system chips) which combine FPGA logic and standard cell logic on one device.