[hpsdr] ALEX - Call for Comments - III

[Lyle Johnson]

> In terms of series R, how much can we allow before the RF switches complain?

I doubt they'd care about 100 R.  These liens will be seldom toggled, I 
was thinking more of the ATLAS bus lines like I2C and SPI.

Lyle
> 
> Phil....VK6APH 
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> 
> Quoting Lyle Johnson <kk7p at wavecable.com>:
> 
>> ***** High Performance Software Defined Radio Discussion List *****
>>
>> Hello Graham!
>>
>>> 2.) Control...
>>> Lyle's KK7P comments on control lines allowing coupling to the
>>> input and output of the filters and allowing "filter bypass"
>>> are noted.
>>>
>>> A question for Lyle or Phil C or someone familiar with the CPLD parts...
>>> If I don't care about output rise and fall time, what is the
>>> largest capacitor (I am thinking 0.01 uF or 0.1 uF, .01 ohm ESR)
>>> that I can throw on the output line of a CPLD?  Will it current
>>> limit and protect itself until the capacitor charges, or will
>>> it trigger life issues after repetitive cycling?
>> Please use series R next to the CPLD pin and then a bypass C if your 
>> goal is to slow an output from the CPLD, series R and then C at the DIN 
>> connector to slow input edges, and a T (series R - shunt C - series R at 
>> the DIN to slow a bidirectional pin.
>>
>> Don't put anything to mess with edges on the JTAG pins!  They normally 
>> will be dormant anyway, so shouldn't cause any operational noise.
>>
>> 73,
>>
>> Lyle KK7P
>>
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