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* This firmware is for the following products:         *
* --------------------------------------------         *
* 520AD4-DD-HD                                         *
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Version 1.7 build 162 fpga 600 (May 17, 2006)
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- When UTIL/DPCL=1FRM (decoder path latency of 1 frame):
  the decoded audio and its PCM substitutes (see UTIL/DDLS
  control) should be free of noise transients.
  Specifically, any broken Dolby packets are filtered out
  of the decoder outputs. Substitute PCM audio path (DMUX or
  AESB) are also protected and undergo 1 frame of delay.
  There is no protection when UTIL/DPCL=min (which is default).
- Video delay feature corrected for PAL-B and 720P50  
- When META/VADL=1, Metadata de-embedder will look for the
  packets with specified DID and sDID (controls META/VAEI,
  META/VAES) in all lines.
- When META/VAKL=kill, the selected packets will be marked
  for deletion on the specified line, or on all lines if
  META/VADL=1. No other packets will be affected.
- When META/VAEN=enbl, all pre-existing packets with the
  same specified DID and sDID (controls META/VAEI, META/VAES)
  on all lines, will be marked for deletion, before embedding
  of the new data. No other packets will be affected.
- CUV bits delayed with audio data
- Corrected unnecessary error status for Meta data generated 
  with OEM Dolby Decoder modules fed with certain Dolby E
  streams.
- Further reduction in occurance of noisy decoder outputs
  after an asynchronous switch. More tolerance to asynchronous
  Dolby inputs.
- You can quick-browse through MONI/dB status items.

Version 1.6 build 011 fpga 484 (Nov 10, 2005)
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- Reduced occasional issue with the Dolby Decoder module
  going into "motorboat" mode after an asynchronous switch
- Embedder has a fix for HD ACP overwrite and spacing issue
- Audio demux is tolerant of 1/2 group SD embedding scheme
  used by some older Sony boxes, at least 1 version of
  Sci.Atl., and the original Evertz 7720AE.
- Audio Demux should tolerate asynchronous embedding better
  (the only artifact should be single sample drop/repeats)
- Fixed misdirected voice-over
- Fixed blanking contents of META dmx and mux when in SD;
  it used to blank the line to Y=0x040 and Cr=Cb=0x040.

Version 1.5 build 2 fpga 453 (July 19, 2005)
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- audio SD dmx should handle embedding distributions that are
  not "5 frame exact".  Also, expanded tolerance of long
  periods without embedded packets, especially in vertical
  areas, in order to work with older embedders.
- metadata packets use "Syntax 1" (previous s/w produced
  "Syntax 0"). The new metadata de-embedder deals with both
  types automatically.
- Support for 720p50
- channel order in SD packets made normal (1,2,3,4) instead of
  previous (1,3,2,4). It used to cause problems for some
  de-embedders.
- new UTIL/DWMX control for Dolby downmix channel ("DDM" channel)
- input metadata is parsed for checksum errors; status or LED
  will blink if failing

Version 1.4 build 3 fpga 391 (June 07, 2005)
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- corrected VistaLink support

Version 1.3 build 236 fpga 365 (January 27, 2005)
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** requires reset command if upgraded from 1.1 or 1.0 **

- corrected embedded HD CUZ bits (still fixed msg)
- added SD 525 video delay
- added audio delay
- added full audio monophonic router/switch
- added voice-over mixer
- partially tested VistaLink support

Version 1.2 build 20 (November 1, 2004)
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** Must perform a factory reset after upgrading to this version of firmware **

- Can handle both h/w build 1 or 2
- added HD mux/dmx/delay and SD mux/dmx
- VANC embedder has a limit of 60 for repeat packets
- Added controls:
	EAUD/GLOK(embedded audio group lock)
	UTIL/2CHA(stereo vs. Mono channel controls)
	UTIL/SRC(to enable external AES input SRC)


Version 1.0 build 50 (July 29, 2004)
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- first release