Jonas Horberg []
authorntfreak <ntfreak@b42882b7-edfa-0310-969c-e2dbd0fdcd60>
Tue, 18 Aug 2009 14:41:58 +0000 (14:41 +0000)
committerntfreak <ntfreak@b42882b7-edfa-0310-969c-e2dbd0fdcd60>
Tue, 18 Aug 2009 14:41:58 +0000 (14:41 +0000)
Jonas Horberg []

1. It can only be built with the FTD2XX driver. libftdi supports FT2232H/FT4232H
since version 0.16

2. A speed value of 0 is used as a RTCK request indicator. This clashes with the
valid clock division value 0 that provide the highest fixed clock frequency.

3. The ft2232_speed_div function return the maximum selectable frequency (30MHz)
when RTCK is activated. It should return 0.

4. The ft2232_khz function return ERROR_OK when RTCK is requested even for
devices lacking RTCK support. It should return ERROR_FAIL so the upper driver layers
can detect this and try to fallback to a fixed frequency.

5. FT2232H/FT4232H have a backward compatibility function that divide the clock
by 5 to get the same frequency range as FT2232D. There is no code that disable
this functionality. I can not find anything about if this is enabled or disabled by default.
I think it is safest to actively disable it.

git-svn-id: svn:// b42882b7-edfa-0310-969c-e2dbd0fdcd60

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