Pass transistor logic in a FPGA

[Nitin]

Hi,
I am a graduate student of Auburn Univeristy doing my research in
SoC testing. I am really an amateur in FPGAs and would like your help.
I have a question, which I think you people can answer. For my
research, I would like to implement a transmission gate into a FPGA.
Can it be done? If yes could you tell me how?

Would really appreciate your help...


Thanks
Nitin

 

[rickman]

Nitin wrote:

Hi,
I am a graduate student of Auburn Univeristy doing my research in
SoC testing. I am really an amateur in FPGAs and would like your help.
I have a question, which I think you people can answer. For my
research, I would like to implement a transmission gate into a FPGA.
Can it be done? If yes could you tell me how?

Would really appreciate your help...

Thanks
Nitin

FPGAs use pass transistors in their internal construction, but the key
word is "internal". AFAIK, they don't make a pass transistor directly
available as a user selectable element. But depending on what features
of the pass transistor you are trying to make use of, you may be able to
use the transistors in the routing or possibly even the LUT for your
application. It has been indicated here that the LUTs use pass
transistors to implement the output mux of the RAM.

Can you give us some insight into what you are trying to do?

--

Rick "rickman" Collins

rick.collins@XYarius.com
Ignore the reply address. To email me use the above address with the XY
removed.

Arius - A Signal Processing Solutions Company
Specializing in DSP and FPGA design URL http://www.arius.com
4 King Ave 301-682-7772 Voice
Frederick, MD 21701-3110 301-682-7666 FAX

 

[Mike Treseler]

Nitin wrote:

I have a question, which I think you people can answer. For my
research, I would like to implement a transmission gate into a FPGA.
Can it be done? If yes could you tell me how?

If you need cover voltage levels other than logic '1' and '0'
see these guys:

http://www.analog.com/
http://www.linear.com/

If you mean to transmit or not transmit specified
logic levels in one direction at a time,
then an FPGA will work fine.

-- Mike Treseler

 

[Jim Granville]

Nitin wrote:

Hi,
I am a graduate student of Auburn Univeristy doing my research in
SoC testing. I am really an amateur in FPGAs and would like your help.
I have a question, which I think you people can answer. For my
research, I would like to implement a transmission gate into a FPGA.
Can it be done? If yes could you tell me how?

No, not in the true analog transmission gate sense, pin to pin.

You can get tinylogic SPST / SPDT analog transmission gates
and drive those from your FPGA.

FPGAs can do Open Drain, so can switch to ground thru 'some ohms',
but that ground will be noisy.
In some apps, that may be enough.

FPGAs also support JTAG boundary scan, for contact integrity
testing.

-jg