[hpsdr] Angelia_v5.5 download package

[Joe Martin]

All, 

I forgot to mention in my announcement (but it is included in the release notes) that in this latest firmware version we have removed the options for selecting which ADC each DDC is using; the assignments are fixed in firmware.  This change was implemented after we realized that switching wide (16-bit), fast data busses in the FPGA is not a great idea because it changes the internal pathlengths for the data into the DDCs depending upon which source is selected.  This results in it being nearly impossible to find a single timing solution that works for all combinations of selections.  Thus, the DDC input sources are now hard coded as follows:

	DDC0 <= temp_ADC[0] 
	DDC1 <= temp_ADC[1] 
	DDC2 <= temp_ADC[0] 
	DDC3 <= temp_ADC[0] 
	DDC4 <= temp_DACD (on Tx) temp_ADC[1] (on Rx) 
	DDC5 <= temp_ADC[0] 
	DDC6 <= temp_ADC[1]	

This eliminates the previous complex switching as only DDC4 input source is switched.  This change should help with firmware timing issues going forward.  

Thanks to John K5IT for bringing this announcement oversight to my attention.  

73, Joe K5SO

> On Jan 29, 2017, at 12:18 AM, Joe Martin <k5so at k5so.com> wrote:
> 
> ***** High Performance Software Defined Radio Discussion List *****
> 
> All, 
> 
> An Angelia_v5.5 download package is available for download at: 
> 
> http://k5so.com/HPSDR_downloads.html
> 
> This version of firmware for Angelia-based radios upgrades the firmware design from Quartus II v13.1 to Quartus Prime Lite v16.0, including upgrades of all megafunctions in the design. The 122.88MHz VCXO lock feature is reworked to operate at 10MHz vs the previous 80KHz which in turn allows removal of one of the previous PLLs, the new PLLs are improved megafunction versions that exhibit lower output noise.  This firmware also removes an unnecessary PTT input in the firmware that had potential for creating audio pops/clicks on Rx-to-Tx transitions.  Details of the changes are listed in the Angelia release notes included in the download package, as is the Quartus source code archive file for the firmware. 
> 
> Thanks, Warren NR0V, for alerting me to the PTT/audio issue!  
> 
> 73, Joe K5SO
> 
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