27C256 EPROM Model spice needed

[sid]

Hello,
I'd like to know if someone has a model spice for eprom 27C256 or 27C512.
Thank's

 

[Chuck Harris]

Why??? Are you planning to use it as an oscillator?

-Chuck Harris

 

[sid]

Hello,
No, I Want to use it as a combinatorial circuit for a true table.
Thank's

 

[Chuck Harris]

Hi Sid,

Then why do you need the spice model? The digital characteristics
of a 27C256 are very well behaved, and very well known. Spice models
deal primarily with analog phenomena.

The best that you could hope for in a spice model of such a complicated
device is a model that shows how the pads (pin drivers/receivers)
behave. Stuff that is mostly only of interest to the designer of the
27C256.

-Chuck Harris

 

[sid]

Hi,
I have to build a system with a GAL , an eprom and a microcontroller.
I Want to simulate the GAL-EPROM before programming the microcontroller.
I can simulate the GAL with the JEDEC file in Pspice but not the EPROM (no
model).
Thank's

 

[sid]

Hi,
the simulation of the eprom by attaching the hex or bin file.
thank's

 

[Chaos Master]

sid called The Usenet Police (tm) of sci.electronics.cad and said to the cops, at
Tue, 10 Feb 2004 18:27:34 -0500:

Hi,
I have to build a system with a GAL , an eprom and a microcontroller.
I Want to simulate the GAL-EPROM before programming the microcontroller.
I can simulate the GAL with the JEDEC file in Pspice but not the EPROM (no
model).
Thank's

PSpice has some RAM and ROM models (IIRC) which may not be 100% equal to the
27C256 but close. Look at the dig_* libraries.

PS: my PSpice knowledge is somewhat rusty (I've moved to SIMetrix).

 

[Charles Edmondson]

sid called The Usenet Police (tm) of sci.electronics.cad and said to the cops, at
Tue, 10 Feb 2004 18:27:34 -0500:



PSpice has some RAM and ROM models (IIRC) which may not be 100% equal to the
27C256 but close. Look at the dig_* libraries.

PS: my PSpice knowledge is somewhat rusty (I've moved to SIMetrix).

You have a hard row to hoe here. You can do eprom models, take a look
in the PSpice Reference Guide in the digital models section, and you
will see a lot of very interesting details in the creation of these
devices. If you get good at it, create a few models and submit them to
Cadence!

Charlie
Edmondson Engineering
Unique Solutions to Unusual Problems

 

[Andy Peters]

Hi,
I have to build a system with a GAL , an eprom and a microcontroller.
I Want to simulate the GAL-EPROM before programming the microcontroller.
I can simulate the GAL with the JEDEC file in Pspice but not the EPROM (no
model).
Thank's

You're simulating the GAL in PSpice? What, are you hand-burning the
fuses, or something? What language are you using to design the GAL?

Why aren't you using a logic simulator?

I'm truly amazed at the levels of complexity some people insist on.

-a

 

[Jim Thompson]

You're simulating the GAL in PSpice? What, are you hand-burning the
fuses, or something? What language are you using to design the GAL?

Why aren't you using a logic simulator?

I'm truly amazed at the levels of complexity some people insist on.

-a

You apparently don't know that PSpice has mixed-signal capability?

...Jim Thompson

 

[Chaos Master]

Andy Peters called The Usenet Police (tm) of sci.electronics.cad and said to the
cops, at 11 Feb 2004 12:10:58 -0800:

You're simulating the GAL in PSpice? What, are you hand-burning the
fuses, or something? What language are you using to design the GAL?

Why aren't you using a logic simulator?

I'm truly amazed at the levels of complexity some people insist on.

PSpice supports mixed-mode simulation.
It uses a JEDEC file as GAL "code". If you can get the demo look at the "frqchk"
example which is an excellent example of PSpice' digital simulation funcions.

 

[Chaos Master]

Charles Edmondson called The Usenet Police (tm) of sci.electronics.cad and said to
the cops, at Wed, 11 Feb 2004 09:46:54 -0800:

You have a hard row to hoe here. You can do eprom models, take a look
in the PSpice Reference Guide in the digital models section, and you
will see a lot of very interesting details in the creation of these
devices. If you get good at it, create a few models and submit them to
Cadence!

Is the PSpice reference guide downloadable from the Internet? I am on vacation
(read: loooots of free time) so I can learn the model creation details.

 

[Charles Edmondson]

Charles Edmondson called The Usenet Police (tm) of sci.electronics.cad and said to
the cops, at Wed, 11 Feb 2004 09:46:54 -0800:




Is the PSpice reference guide downloadable from the Internet? I am on vacation
(read: loooots of free time) so I can learn the model creation details.

Well, that is a yes and no! If you have Sourcelink access at Cadence,
then it is definitely downloadable, or if you have any of the CDs, its
on them. Otherwise, it is time to search the web for a University ftp
site that has the PDF on it!

Charlie
Edmondson Engineering
Unique Solutions to Unusual Problems