The paper presents a case study on augmenting a TriMedia/CPU64 processor with a Reconfigurable (FPGA-based) Functional Unit (RFU). We first propose an extension of the TriMedia/CPU64 architecture, which consists of a RFU and its associated instructions. Then, we address the computation of the 8 × 8 IDCT on such extended TriMedia, and propose a scheme to implement an 8-point IDCT operation on the RFU. Further, we address the decoding of Variable Length Codes and describe the FPGA implementation of a Variable Length Decoder (VLD) computing facility. When mapped on anACEX EP1K100 FPGA from Altera, our 8-point IDCT exhibits a latency of 16 and a recovery of 2 Tri-Media cycles, and occupies 42% of the FPGA’s logic array blocks. The proposed VLD exhibits a latency of 7 TriMedia cycles when mapped on the same FPGA, and utilizes 6 of its embedded array blocks. By using the 8-point IDCT computing facility, an 8×8 IDCT including all overheads can be computed with the throughput of 1/32 IDCT/cycle. Also, with the proposedVLD computing facility, a single DCT coefficient can be decoded in 11 cycles including all overheads. Simulation results indicate that by configuring each of the 8-point IDCT andVLD computing facilities on a different FPGA context, and by activating the contexts as needed, the augmented TriMedia can perform MPEG macroblock parsing followed up by a pel reconstruction with an improvement of 20-25% over the standard TriMedia.
CITATION STYLE
Sima, M., Cotofana, S., Vassiliadis, S., van Eijndhoven, J. T. J., & Vissers, K. (2002). A reconfigurable functional unit for trimedia/CPU64. A case study. In Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) (Vol. 2268, pp. 224–241). Springer Verlag. https://doi.org/10.1007/3-540-45874-3_13
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