Forums

ADSP-21065L to Micron's MT48LC2M32B2

Started by Jaime Andres Aranguren Cardona December 11, 2004
Hi,

For a project I'm working on, I need SDRAM interfacing to the
ADSP-21065L (my very first project involving design with SDRAM parts).
One suitable part is the MT48LC2M32B2 from Micron. Has anyone already
used this part or any other very similar for interfacing to the 065L?
Any special requeriments or considerations to take caro of? The nicest
things about this part are its direct 32 bit data support, and low
price.

I have one doubt: this part is 4-banked (BA1, BA0). AD13 and AD12
should be used as the bank select signals, but I don't know how
exactly is the connection, either AD13-BA1 and AD12-BA0, or otherwise.
Please clarify this to me.

Something else: there is only one DQM signal on the DSP, and four DQMs
on the SDRAM, for each byte of data. Can the DQM signal be directly
connected to all of the DQM0-3 on the SDRAM directly? I suspect the
answer is "yes", since it's output of the DSP and input to the SDRAM
when writting, and tristated in both parts when reading; I just want
you guys to confirm this, since I don't want to do hardware redesigns,
which is rather expensive.

Regards,

JaaC
Good new for you:  I have used those exact 2 parts in a design and it works just
fine!  More comments interspersed.

"Jaime Andres Aranguren Cardona" <jaime.aranguren@ieee.org> wrote in message
news:14a86f87.0412111844.2776250a@posting.google.com...
> Hi, > > For a project I'm working on, I need SDRAM interfacing to the > ADSP-21065L (my very first project involving design with SDRAM parts). > One suitable part is the MT48LC2M32B2 from Micron. Has anyone already > used this part or any other very similar for interfacing to the 065L? > Any special requeriments or considerations to take caro of? The nicest > things about this part are its direct 32 bit data support, and low > price.
I don't remember anything particularly tricky--just wired it up per the SHARC documentation. Getting all the bits of the SDRAM controller register set-up takes a bit of care, but as long as you have both the SDRAM and SHARC documentation in front of you, it is straightforward.
> I have one doubt: this part is 4-banked (BA1, BA0). AD13 and AD12 > should be used as the bank select signals, but I don't know how > exactly is the connection, either AD13-BA1 and AD12-BA0, or otherwise. > Please clarify this to me.
You got it right: AD13->BA1, AD12->BA0
> Something else: there is only one DQM signal on the DSP, and four DQMs > on the SDRAM, for each byte of data. Can the DQM signal be directly > connected to all of the DQM0-3 on the SDRAM directly? I suspect the > answer is "yes", since it's output of the DSP and input to the SDRAM > when writting, and tristated in both parts when reading; I just want > you guys to confirm this, since I don't want to do hardware redesigns, > which is rather expensive.
"yes"! Wire them all together. Since the SHARC operates on 32 bits at a time, it doesn't really support the byte-wide masking stuff that you get with multiple DQM inputs.
> I don't remember anything particularly tricky--just wired it up per the
SHARC
> documentation. Getting all the bits of the SDRAM controller register
set-up
> takes a bit of care, but as long as you have both the SDRAM and SHARC > documentation in front of you, it is straightforward. >
> > You got it right: AD13->BA1, AD12->BA0 >
> > "yes"! Wire them all together. Since the SHARC operates on 32 bits at a
time,
> it doesn't really support the byte-wide masking stuff that you get with
multiple
> DQM inputs.
Thanks a lot, Jon. -- Jaime Andr&#2013265929;s Aranguren Cardona jaac@nospam.sanjaac.com SanJaaC Electronics Soluciones en DSP www.sanjaac.com (Remove "nospam" from e-mail address)
Hi, I am thinking of using the SDRAM in a project but cant find the price
anywhere, do you remember what you paid for yours?

Regards Martin
Hi,
> >For a project I'm working on, I need SDRAM interfacing to the >ADSP-21065L (my very first project involving design with SDRAM parts). >One suitable part is the MT48LC2M32B2 from Micron. Has anyone already >used this part or any other very similar for interfacing to the 065L? >Any special requeriments or considerations to take caro of? The nicest >things about this part are its direct 32 bit data support, and low >price. > >I have one doubt: this part is 4-banked (BA1, BA0). AD13 and AD12 >should be used as the bank select signals, but I don't know how >exactly is the connection, either AD13-BA1 and AD12-BA0, or otherwise. >Please clarify this to me. > >Something else: there is only one DQM signal on the DSP, and four DQMs >on the SDRAM, for each byte of data. Can the DQM signal be directly >connected to all of the DQM0-3 on the SDRAM directly? I suspect the >answer is "yes", since it's output of the DSP and input to the SDRAM >when writting, and tristated in both parts when reading; I just want >you guys to confirm this, since I don't want to do hardware redesigns, >which is rather expensive. > >Regards, > >JaaC >
This message was sent using the Comp.DSP web interface on DSPRelated.com
msg99007 wrote:

> Hi, I am thinking of using the SDRAM in a project but cant find the price > anywhere, do you remember what you paid for yours? > > Regards Martin > Hi,
What has this to do with ADSP-21065L to Micron's MT48LC2M32B2? There must be a way to start a new thread in the software you use. This message was sent using the Comp.DSP web interface on DSPRelated.com Is everybody there a little wide of center? Jerry -- Engineering is the art of making what you want from things you can get. &#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;
Jerry Avins wrote:

> msg99007 wrote: > > >>Hi, I am thinking of using the SDRAM in a project but cant find the price >>anywhere, do you remember what you paid for yours? >> >>Regards Martin >>Hi, > > > What has this to do with ADSP-21065L to Micron's MT48LC2M32B2? There > must be a way to start a new thread in the software you use.
For that matter you could ask on sci.electronics.components and get good advise.
> > This message was sent using the Comp.DSP web interface on DSPRelated.com > > Is everybody there a little wide of center?
Jerry! That's it! I can never describe myself as Left or Right because my political views are scattered all over the map, yet few of them are actually _in_ the center. I'm not Left or Right -- I'm just wide of center! Thanks! -- Tim Wescott Wescott Design Services http://www.wescottdesign.com
Doesn't seem too off-the-wall to me--in a thread discussing a particular SDRAM,
someone asks what the price of that SDRAM is.  Though it seems to me it would
have possibly been better directed as a personal e-mail to the OP if possible.
And I certainly wouldn't make the jump that everyone on DSPRelated.com is "wide
of center" based on this post!

"Jerry Avins" <jya@ieee.org> wrote in message
news:36sa11F53oqodU1@individual.net...
> msg99007 wrote: > > > Hi, I am thinking of using the SDRAM in a project but cant find the price > > anywhere, do you remember what you paid for yours? > > > > Regards Martin > > Hi, > > What has this to do with ADSP-21065L to Micron's MT48LC2M32B2? There > must be a way to start a new thread in the software you use. > > This message was sent using the Comp.DSP web interface on DSPRelated.com > > Is everybody there a little wide of center? > > Jerry > -- > Engineering is the art of making what you want from things you can get. > &#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;
Tim Wescott wrote:

  ...

> Jerry! That's it! I can never describe myself as Left or Right because > my political views are scattered all over the map, yet few of them are > actually _in_ the center. I'm not Left or Right -- I'm just wide of > center!
Welcome to the club! One question to ponder, though: what's the difference between an eccentric and a crank? Jerry -- Engineering is the art of making what you want from things you can get. &#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;
Jon Harris wrote:

> Doesn't seem too off-the-wall to me--in a thread discussing a particular SDRAM, > someone asks what the price of that SDRAM is. Though it seems to me it would > have possibly been better directed as a personal e-mail to the OP if possible. > And I certainly wouldn't make the jump that everyone on DSPRelated.com is "wide > of center" based on this post!
I didn't understand that it was the same SDRAM, just SDRAM in general. As for "wide of center", this isn't the first post to come via that route that seemed a bit odd to me. Maybe it's just me. Jerry -- Engineering is the art of making what you want from things you can get. &#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;
>As for "wide of center", this isn't the first post to come via that >route that seemed a bit odd to me. Maybe it's just me.
I have to agree with you that so far, contributions from visitors on the site have not been of the highest quality. The reasons for this are not completely clear to me yet. I must say that the interface is still only a few weeks old and I am improving it on a weekly basis. I am of course opened to suggestions. Stephane Boucher This message was sent using the Comp.DSP web interface on DSPRelated.com