The interface makes the FPGA
Announcements from the FPGA industry this week continue the trend of the past year of placing the serial interface before the gate count or the core-logic IP – an understandable strategy, given the number of vertical markets for which interface virtually defines application (note that I did not say raw speed, though that is a secondary consideration).
Xilinx Inc. used the recent InterBEE conference in Tokyo to spotlight the latest of its Targeted Design Platforms, in this case one for broadcast video. The “Broadcast Connectivity” platform utilizes Virtex-6 devices with SDI interfaces that can be applied to SD, HD, or 3-D SDI connections, in single-chip instantiations that include up to 24 transceivers. While the Virtex-6 itself and the ISE Design Suite obviously are important elements of this kit, the star of the show as seen from here is the FPGA Mezzanine Card used to implement both the video interfaces themselves, and the bridging technologies tying the interfaces together. The triple-rate SDI links cover 270 Mbit/sec (SD), 1.485 Gbit/sec (HD), and 2.97 Gbit/sec (3-D SDI) speeds.
Meanwhile, Lattice Semiconductor Corp. and Altera Corp. have added Serial RapidIO 2.1 support to their ECP3 and Stratix IV families, respectively, in the form of soft IP blocks. Some folks concentrating on server-cluster or wireline communication applications may see SRIO as an also-ran link competing with the likes of HyperTransport inter-chip and PCI Express board-to-board. But Lattice and Altera rightly point out that SRIO is winning a dedicated space in advanced base stations, where the links are used to connect baseband clusters, formerly implemented in dedicated DSPs, but now increasingly in DSP/FPGA mixes. Lattice’s 2.1 update support single- dual- and quad-lane SRIO at speeds up to 3.125 Gbits/sec, while Altera expands to as many as four lanes, at up to 5 Gbits/sec per lane. These speeds allow low-power base stations to support 4G mixes of Long-Term Evolution and WiMAX.
Expect I/O to define the 2010 market for FPGAs – not just in terms of raw speed of the Serdes, but also in terms of the Layers 1 through 3 protocols supported for these emerging markets.
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