mirror of https://github.com/YosysHQ/yosys.git
131 lines
3.2 KiB
Plaintext
131 lines
3.2 KiB
Plaintext
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See fstapi.h for the values for the FST_BL_XXX enums.
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===========================================================================
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compressed wrapper (typically over whole file)
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uint8_t FST_BL_ZWRAPPER
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uint64_t section length
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uint64_t length of uncompressed data
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[zlib compressed data]
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===========================================================================
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header block
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uint8_t FST_BL_HDR
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uint64_t section length
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uint64_t start time
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uint64_t end time
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double endian test for "e"
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uint64_t memory used by writer
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uint64_t scope creation count
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uint64_t var creation count
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uint64_t max var idcode
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uint64_t vc section count
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int8_t timescale exponent
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[128 bytes] version
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[128 bytes] date
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===========================================================================
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geometry block
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uint8_t FST_BL_GEOM
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uint64_t section length
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uint64_t length of uncompressed geometry data
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uint64_t maxhandle
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[compressed data]
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(length of compressed data is section length - 24)
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===========================================================================
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hierarchy block
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uint8_t FST_BL_HIER
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uint64_t section length
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uint64_t length of uncompressed hier data
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[zlib compressed data]
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or
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uint8_t FST_BL_HIER_LZ4
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uint64_t section length
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uint64_t length of uncompressed hier data
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[lz4 compressed data]
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uint8_t FST_BL_HIER_LZ4DUO
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uint64_t section length
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uint64_t length of uncompressed hier data
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varint length of hier data compressed once with lz4
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[lz4 double compressed data]
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===========================================================================
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dumpon/off block
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uint8_t FST_BL_BLACKOUT
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uint64_t section length
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varint num blackouts (section below is repeated this # times)
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[
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uint8_t on/off (nonzero = on)
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varint delta time
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]
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===========================================================================
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1..n value change blocks:
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// header
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uint8_t FST_BL_VCDATA (or FST_BL_VCDATA_DYN_ALIAS)
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uint64_t section length
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uint64_t begin time of section
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uint64_t end time of section
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uint64_t amount of buffer memory required in reader for full vc traversal
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varint maxvalpos (length of uncompressed data)
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varint length of compressed data
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varint maxhandle associated with this checkpoint data
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[compressed data]
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---
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// value changes
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varint maxhandle associated with the value change data
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uint8_t pack type ('F' is fastlz, '4' is lz4,
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others ['Z'/'!'] are zlib)
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varint chain 0 compressed data length (0 = uncompressed)
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[compressed data]
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...
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varint chain n compressed data length (0 = uncompressed)
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[compressed data]
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---
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// index: chain pointer table (from 0..maxhandle-1)
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varint if &1 == 1, this is <<1 literal delta
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if &1 == 0, this is <<1 RLE count of zeros
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if == 0, next varint is handle of prev chain to use,
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bit only if FST_BL_VCDATA_DYN_ALIAS or
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later VCDATA format
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---
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uint64_t index length (subtract from here to get index position)
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---
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[compressed data for time section]
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uint64_t uncompressed data length in bytes
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uint64_t compressed data length in bytes
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uint64_t number of time items
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// end of section
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===========================================================================
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