fpga bitstream format?

configuration flash memory에 저장되는 데이터는 어떤 포맷인가 검색을 해봤는데

LSB 로 저장된다 정도만 알았을 뿐이지 어떤 식으로 구현이 적용되는지

포맷 자체가 어떤지는 알 수가 없네...

MCU의 파일이야 ELF 포맷이라던가 그런식으로 존재하는데..

얘는 로직셀에 직접 쓰여지고 적용되는 거니..

당연(?)할지 모르겠지만 altera나 xilinx의 제품간의 바이너리가 호환될리는...

당연히 없을려나?

그나저나 이녀석.. 쓰는건 드럽게 느리고

켜지는건 드럽게 빠른데 도대체 이유를 모르겠네..

BIT Swapping in PROM Files The PROM Formatter produces a PROM file in which the bits within a byte are swapped compared to the bits in the input BIT file. Bit swapping (also called bit mirroring) reverses the bits within each byte. In a bitstream contained in a BIT file, the Least Significant Bit (LSB) is always on the left side of a byte. But when a PROM programmer or a microprocessor reads a data byte, it identifies the LSB on the right side of the byte. In order for the PROM programmer or microprocessor to read the bitstream correctly, the bits in each byte must first be swapped so they are read in the correct order. The bits are automatically swapped for all of the PROM formats: MCS, EXO, BIN and TEK. For a HEX file output, bit swapping is on by default, but it can be turned off by deselecting a Swap Bits option.

[링크 : https://www.xilinx.com/itp/xilinx10/isehelp/pim_r_promformatter_files.htm]

Bob Stein February 22nd, 2014, 12:02 PM Found the answer (http://quartushelp.altera.com/current/mergedProjects/reference/glossary/def_rbf.htm). It is LSB first.

[링크 : https://alteraforum.com/forum/archive/index.php/t-36022.html]