[time-nuts] Divide by five

Bob Camp kb8tq at n1k.org
Sat Nov 8 21:35:18 EST 2014


Hi

One of the more interesting uses for something like a Cyclone V would be a front end board to drive a KS-24361 from an ensemble of sources. That’s what David Allan’s original idea was when he started the whole software empire that turned into the Z3801 and all the rest.

Bob

> On Nov 8, 2014, at 8:36 PM, Bert Kehren via time-nuts <time-nuts at febo.com> wrote:
> 
> We do most our projects with Altera G/A.
> The biggest benefit is that if something does not work on first pass  
> changing the G/A logic is much faster, less costly than a new board  layout.
> Bert Kehren
> 
> 
> In a message dated 11/8/2014 6:17:29 P.M. Eastern Standard Time,  
> kb8tq at n1k.org writes:
> 
> Hi
> 
> I’ve done a lot of designs with Altera parts. They are  fine parts, but 
> they are not magic. On the CPLD parts, be careful of the speed  grade and be 
> sure you do a timing analysis on your design before you buy any  hardware. All 
> the design tools are schematic entry capable and free on the  web. There’s 
> not a big speed bump when you start using them (like say needing  to go 
> learn VHDL…). 
> 
> Once you get using them, the CPLD's are quite  handy for a wide range of 
> projects, way beyond a simple divide by 5. Their  bigger cousins (the FPGA’s) 
> aren’t that much more (under $35) and they will do  a LOT, especially in the 
> newer series. The Cyclone 2’s had a minimum rated PLL  input of 20(?) MHz. 
> The later parts bumped that down to 10 MHz. Much more  TimeNuts compatible. 
> 
> Bob
> 
>> On Nov 8, 2014, at 5:58 PM, cfo  <xnews5 at luna.dyndns.dk> wrote:
>> 
>> On Sat, 08 Nov 2014  09:58:36 +0100, Francesco Messineo wrote:
>> 
>>> 
>>> can anyone suggest a (cheap if possible) programmer and software  for
>>> these modern PLD?
>>> 
>>> Thanks and best  regards Frank  IZ8DWF
>> 
>> I'd suggest ALTERA parts , but  only because they are the cheapest boards 
>> on *bay , XILINX boards are  2 x the Altera price on *Bay.
>> 
>> An EPM240 CPLD Board $9   (240 cells let you do quite a lot)
>> http://tinyurl.com/qcusb69
>> 
>> There's also an EPM-570 Board , but the price is almost the same as  the 
>> below FPGA , and then the FPGA is the thing to get.
>> 
>> 
>> A CycloneII EP2C5T144 FPGA board (With 2 onbard PLL's) $18 -  Super value 
>> for the money
>> http://tinyurl.com/pd326ct
>> 
>> An ALTERA Programmer  $6
>> http://tinyurl.com/po2qhq2
>> 
>> 
>> The only caveat is that  they are NOT 5v tolerant , they can do 3v3 or 
>> less.
>> 
>> 
>> ALTERA has the free QuartusII WEB Edition , and it works fine under  both 
>> Windows & Linux (i'm using Mint17 x64 ... Ubuntu 14.04 based  "under the 
>> hood")
>> 
>> I am a VHDL beginner , and  completed this (free) course s few month back
>> 
>> Course
>> http://tinyurl.com/per8lm5
>> 
>> Forum 
>> http://tinyurl.com/pw3b9bv
>> 
>> 
>> I have just did a divide  by 5 with the EP2C5T144 FPGA board , using one 
>> of the PLL's. I did  use so few resources, that it reported 0% of the 
> 4608 
>> Cells utilized,  and 1 of 2 PLL's used.
>> 
>> *********** SNIP *************
>> Fitter Status    Successful - Sat Nov  8 23:11:59 2014
>> Quartus II 64-Bit Version    13.0.1 Build 232 06/12/2013 SP 1 SJ Web  
>> Edition
>> Revision Name    div5pll
>> Top-level  Entity Name    div5pll
>> Family    Cyclone  II
>> Device    EP2C5T144C8
>> Timing Models     Final
>> Total logic elements    0 / 4,608 ( 0 % )
>> Total combinational functions    0 / 4,608 ( 0 % )
>> Dedicated  logic registers    0 / 4,608 ( 0 % )
>> Total registers   0
>> Total pins    6 / 89 ( 7 % )
>> Total virtual  pins    0
>> Total memory bits    0 / 119,808 ( 0 %  )
>> Embedded Multiplier 9-bit elements    0 / 26 ( 0 %  )
>> Total PLLs    1 / 2 ( 50 % )
>> *********** SNIP  *************
>> 
>> Actually i like Xilinx ISE WebPack better , but  the cheap 
> *Bay/Aliexpress 
>> boards are ALTERA Boards , so i have both  tools installed on my linux 
>> machine.
>> 
>> 
>> If you  don't feel like learning VHDL or Verilog , you can do the layout 
>> in  "Schematic". ALTERA QuartusII does have an extensive 74xx lib built 
> in  
>> the schematic engine.
>> 
>> See my ansver to assignment 10  , for a QuartusII schematic entry of a 
> 50M 
>> divider. Using use 4 x  HC390 dividers in a divide : 100 / 100 / 100 / 50 
>> configuration.
>> http://tinyurl.com/ntdkcst
>> 
>> 
>> Be  sure to get these versions of the tools , as both have upgraded their 
>> tools , and the new tools doesn't support the older (cheaper chips).
>> 
>> Altera QuartusII  : Version 13.0sp1  (13.1+ doesn't suport  the old 
> CPLD's)
>> Xilinx ISE      : Version 14.7   (Vivado doesn't support the old stuff)
>> 
>> 
>> I  suggest to try it out , you can do a lot of logic in a 240 Cell CPLD , 
> 
>> and MUCH more in the FPGA. 
>> 
>> The 4 x HC390 used 16%  of the EPM240 logic , and it is less than 1% in 
>> the FPGA. As seen  below.
>> 
>> *********** SNIP ***************
>> Flow  Status    Successful - Sat Nov  8 23:56:46 2014
>> Quartus  II 64-Bit Version    13.0.1 Build 232 06/12/2013 SP 1 SJ Web  
>> Edition
>> Revision Name    lesson10d
>> Top-level Entity Name    lesson10d
>> Family     Cyclone II
>> Device    EP2C5T144C8
>> Timing Models   Final
>> Total logic elements    39 / 4,608 ( < 1 %  )
>> Total combinational functions    39 / 4,608 ( < 1 %  )
>> Dedicated logic registers    31 / 4,608 ( < 1 %  )
>> Total registers    31
>> Total pins    3 /  89 ( 3 % )
>> Total virtual pins    0
>> Total memory  bits    0 / 119,808 ( 0 % )
>> Embedded Multiplier 9-bit  elements    0 / 26 ( 0 % )
>> Total PLLs    0 / 2 ( 0  % )
>> *********** SNIP ***************
>> 
>> 
>> CFO -  Denmark
>> 
>> -- 
>> E-mail:xnews5 at luna.dyndns.dk
>> 
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