RE: [Discuss-gnuradio] rx_buffer_inband.v FX2 bug

[Eric Schneider]

Arg.  Ok, so the RD counter is cleared along with a drop of RD too.  So I
guess I can assume that RD must be cleared for at least one cycle between
packets?  Maybe some fresh air would be a good idea too.  :-)

--ets

> -----Original Message-----
> From: Eric Schneider [mailto:address@hidden
> Sent: Thursday, September 04, 2008 12:21 PM
> To: address@hidden
> Subject: [Discuss-gnuradio] rx_buffer_inband.v FX2 bug
> 
> The new rx_buffer_inband.v is very nearly complete.
> 
> The FX2/USB interface code refers to a "FX2 Bug Fix" or "257 Bug Fix"
> in the
> non inband rx_buffer.  I'm assuming that this bug is that the FX2 keeps
> the
> RD line set for 257 usbclk cycles instead of 256.  The coded fix is a
> 256
> step counter preventing the 257th read, which is cleared by the
> bus_reset
> signal.
> 
> But bus_reset is connected to the master_control module, which only
> sets it
> on a full reset.  So it would seem that the FX2 is only doing the extra
> RD
> on the first packet transferred (after reset), not every packet.  Is
> that
> correct?
> 
> Does anyone have any simulation waveforms (Quartus) for the FX2
> interface?
> 
> Any other gotchas I should be aware of regarding the FX2 interface?
> 
> --ets
> 
> 
> 
> 
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