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Altera was a bit more forthcoming with its OpenCL aspirations for single-die ARM-plus-FPGA products such as the . As Figure 2 taken from Altera's OpenCL presentation suggests, an OpenCL-based design approach has notable merit. However, it will require that Altera evolve the OpenCL SDK's support beyond its current x86 CPU-only and PCI Express interconnect-only foundations. As such, Chang and Grbic were unwilling to forecast when OpenCL SoC support might appear, either in a private beta or public form.
Advanced FPGA Synthesis - Mentor Graphics
Figure 1 shows that a physical synthesis tool is also run as part of the whole synthesis flow. Physical synthesis tools are run as part of synthesis tools, but after logic synthesis, for additional clarity it can be referred to early physical synthesis. In this flow after logic synthesis the tool models placement and routing of the whole design and tries to improve the critical paths again by using well known algorithms like retiming and replication. Some EDA vendors have launched such tools based on this level of accuracy to elevate the timing closure problems.
Overview of FPGA/PLD design flow and products
FPGA Area Reduction by Multi-Output Function Based Sequential . We propose a new algorithm for FPGA area reduction. In contrast to existing techniques, which consider only single-output Boolean functions and the combinational portion of a circuit, we consider multi-output functions and retiming, and develop effective algorithms that incorporate recent improvements to SAT-based Boolean matching. Our experimental results show that the proposed algorithm reduces area up to 35% compared to the best existing academic technology , Berkeley ABC. Furthermore, considering multi-output functions obtains 3x more area reduction compared to considering single-output functions, and sequential obtains 1.5x more area reduction compared to combinational when both consider multi-output functions. At the same time, all results preserve the optimal logic depth produced by the ABC . The paper was presented in IWLS08 and DAC08 . The implementation of this work has been included as a part of the Open Access Gear package and we received the .
XST Synthesis Overview - Xilinx
Design, Synthesis and Evaluation of Heterogeneous FPGA. Small gates, such as AND2, XOR2 and MUX2, have been mixed with lookup tables () inside the programmable logic block (PLB) to reduce area and power and increase performance in . However, it is unclear whether incorporating macro-gates with wide inputs inside is beneficial. In this work, we first propose a methodology to extract a small set of logic functions that are able to implement a large portion of functions for given FPGA applications. Assuming that the extracted logic functions are implemented by macro-gates in , we then develop a complete synthesis flow for such heterogeneous with mixed and macro-gates. The flow includes a cut-based delay and area optimized technology mapping, a mixed binary integer and linear programming based area recovery algorithm to balance the resource utilization of macro-gates and for area-efficient packing, and a SAT-based packing. We finally evaluate the proposed heterogeneous FPGA using the newly developed flow and show that mixing LUT and macro-gates, both with 6 inputs, improves performance by 16.5% and reduces logic area by 30% compared to using merely 6-input . IWLS'07  and ICCAD'07 .
Synthesis - FPGAs 101 - Chapter 6
Altera's approach is oriented towards high-performance computing applications. In this context, OpenCL is a sensible choice of language. And as such, Altera has developed an innovative approach. By "freezing" many elements of the architecture, Altera has created a "sandbox" in which users can utilize the FPGA without doing any RTL (register-transfer level) design. This is different from the Xilinx approach, which is to use HLS for the algorithmic portions of the application, with RTL (i.e. HDL) design used for the remainder of the FPGA design.