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ORSO82G5-3F680C Datasheet(PDF) 6 Page - Lattice Semiconductor |
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ORSO82G5-3F680C Datasheet(HTML) 6 Page - Lattice Semiconductor |
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6 / 153 page  Lattice Semiconductor ORCA ORSO42G5 and ORSO82G5 Data Sheet 6 setup/hold and clock to out performance. • New Double-Data Rate (DDR) and zero-bus turn-around (ZBT) memory interfaces support the latest high-speed memory interfaces. • New 2x/4x uplink and downlink I/O capabilities interface high-speed external I/Os to reduced speed internal logic. • ispLEVER™ development system software. Supported by industry-standard CAE tools for design entry, synthe- sis, simulation, and timing analysis. • Meets Universal Test and Operations PHY Interface for ATM (UTOPIA) levels 1, 2, and 3; as well as POS-PHY3. Description What Is an FPSC? FPSCs, or Field-Programmable System Chips, are devices that combine field-programmable logic with ASIC or mask-programmed logic on a single device. FPSCs provide the time to market and the flexibility of FPGAs, the design effort savings of using soft Intellectual Property (IP) cores, and the speed, design density, and economy of ASICs. FPSC Overview Lattice’s Series 4 FPSCs are created from Series 4 ORCA FPGAs. To create a Series 4 FPSC, several columns of Programmable Logic Cells (see FPGA Logic Overview section for FPGA logic details) are added to an embedded logic core. Other than replacing some FPGA gates with ASIC gates, at greater than 10:1 efficiency, none of the FPGA functionality is changed—all of the Series 4 FPGA capability is retained: Embedded Block RAMs, MPI, PCMs, boundary scan, etc. The columns of programmable logic are replaced at the right of the device, allowing pins from the replaced columns to be used as I/O pins for the embedded core. The remainder of the device pins retain their FPGA functionality. FPSC Gate Counting The total gate count for an FPSC is the sum of its embedded core (standard-cell/ASIC gates) and its FPGA gates. Because FPGA gates are generally expressed as a usable range with a nominal value, the total FPSC gate count is sometimes expressed in the same manner. Standard-cell ASIC gates are, however, 10 to 25 times more silicon- area efficient than FPGA gates. Therefore, an FPSC with an embedded function is gate equivalent to an FPGA with a much larger gate count. FPGA/Embedded Core Interface The interface between the FPGA logic and the embedded core has been enhanced to allow a greater number of interface signals than on previous FPSC architectures. Compared to bringing embedded core signals off-chip, this on-chip interface is much faster and requires less power. All of the delays for the interface are precharacterized and accounted for in the ispLEVER Development System. ORCA Series 4 based FPSCs expand this interface by providing a link between the embedded block and the multi- master 32-bit system bus in the FPGA logic. This system bus allows the core easy access to many of the FPGA logic functions including the Embedded Block RAMs and the MicroProcessor Interface. Clock spines also can pass across the FPGA/embedded core boundary. This allows for fast, low-skew clocking between the FPGA and the embedded core. Many of the special signals from the FPGA, such as DONE and global set/reset, are also available to the embedded core, making it possible to fully integrate the embedded core with the FPGA as a system. For even greater system flexibility, FPGA configuration RAMs are available for use by the embedded core. This supports user-programmable options in the embedded core, in turn allowing for greater flexibility. Multiple embed- ded core configurations may be designed into a single device with user-programmable control over which configu- rations are implemented, as well as the capability to change core functionality simply by reconfiguring the device. |
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