Creator Error

[ETRO_SSN583]

In a test to see if I could route a  64 channel analog mux into a SAR I picked up on

an error associate with mux. It reported, as shown, only 5 address bits, but errored

when I gave it a 5 bit buss. Whn I gave it 6 bit buss it stopped complaing, but you can

see in symbol its still reporting only 5 bits needed.

Regards, Dana.

[Len_CONSULTRON]

Dana,

a 64 input mux = 2^6.  Hence 6-bits of the counter is needed not 5.

[ETRO_SSN583]

Yes, but tool is showing buss width at mux is only 5 bits, thats the error, the label

the tool shows. See circled label on the screenshot I posted.

Regards, Dana.

[Len_CONSULTRON]

Dana,

You are correct.  It is a limitation of the AmuxHW component.

I imported the AMuxHW component into a project.

I opened the "AMuxHw_v1_50.cysym" file.

I select the "2" highlighted above.

The field came up:

`=($Mode == MuxMode)?(($Channels <= 2)? 1 : (($Channels <= 4)? 2:(($Channels <=8)?3:(($Channels <= 16)?4:5)))):($Channels)`

Based on the above equation, any number of Channels > 16 is treated as 2^5.  There "5" is the largest "n" factor in 2^n.

This might only be a user feedback/visual issue.  The actual feeding of a 6-bit bus (2^6) on a 64-bit mux might still work fine.

Someone would have to code review the ".v" (Verilog) file to determine if there would be a problem.

Update

I've modified the AMuxHW_v1_50 to AMuxHW_v1_51 where the bus width is increased to now support upto 128 Amux inputs (@ 7-bit bus width).

Just unarc the zip file attached into your project directory.  It should show up on the Component Catalog.

[MotooTanaka]

Hi,

It would be nice, if you can tell us which device and component you are using.

This time, I assumed a PSoC 4 and the component is Analog Hardware Mux.

At first I tried a 2-input Amux and it seems to be OK.

Then I tried a 16-input Amux and it seems to be OK.

Then I tried a 32-input Amux and it seems to be OK.

So far, so good 😉

Then I tried a 36-input Amux, this should require 6-bit for selector bus.

But it still shows 5!  This could be a bug at this point.

Then I tried 64-input, which also should require 6-bit selector bus. 

And I think that this is your case, too.

Then I went 128-input, which should require 7-bit selector bus.

Finally the maximum number of inputs, which is 256, 

and the selector bus should be 8-bit

So what I observed is that the bit-width of the selector bus in the Analog Hardware Mux

with more than 32-input is incorrect.

I would call it a bug, if I may.

I hope that  Infineon (Cypress) will fix this soon 😉

moto

 

 

 

 

[Yugandhar]

Hello,

We have forwarded your query to our internal team, who will evaluate your query.
We will provide a response as soon as we get an update from our internal team.
Thank you for your patience.

Thanks and Regards,
P Yugandhar