본 연구는 대규모 영상처리를 위한 메모리 확장을 위한 외장 메모리 확장장치 구현에 관련된 내용으로, 이는 영상처리를 위한 그래픽 워크스테이션에 장착되는 PCI(Peripheral Component Interconnect) Express Gen3 x8 인터페이스를 가지는 외장 메모리 어댑터 카드와 외장 DDR(Dual Data Rate) 메모리로 구성된 외장 메모리 보드로 구성되며, 메모리 어댑터 카드와 외장 메모리 보드간의 연결은 광 인터페이스를 통하여 이루어진다. 외장 메모리 억세스를 위해서는 Programmable I/O 방식과 DMA(Direct Memory Access) 방식을 모두 사용할 수 있도록 하여 영상 데이터의 효율적 송수신이 이루어지도록 하였다. 본 연구 결과의 구현은 Altera Stratix V FPGA (Field Programmable Gate Array)와 40G 광 트랜시버가 장착된 보드를 사용하였으며, 1.6GB/s의 대역폭 성능을 보여주고 있다. 이는 4K UHD(Ultra High Definition) 영상 한 채널을 담당할 수 있는 규모이다. 향후 본 연구를 계속 진행하여 3GB/s 이상 대역폭을 보이는 연구결과를 보일 예정이다.
KSP Keywords
Field Programmable Gate Arrays(FPGA), data rate, direct memory access, ultra high definition
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