Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.forth > #10511

GA144 memory interfacing was Re: GA144 Application Board

Show all headers | View raw

In article <29c5b9f9-65da-44ed-aacb-0baaa9130e72@eb6g2000vbb.googlegroups.com>,
rickman  <gnuarm@gmail.com> wrote:
>On Mar 23, 2:15=A0pm, Roger Ivie <ri...@ridgenet.net> wrote:
>> On 2012-03-23, rickman <gnu...@gmail.com> wrote:
>>
>> > Farnell is EU and I am USA. =A0We hae Digikey and Mouser, both with goo=
>d
>> > parts search engines. =A0I prefer Digikey and have a company account,
>> > never a delivery problem. =A0In fact, I've discovered that US Mail
>> > Priority mail is faster for me than UPS and cheaper too!
>>
>> The US outlet of Farnell is Newark. I only know this because of
>> the recent Raspberry Pi hoopla.
>>
>> It looks to me like there were a couple of typos in the part number;
>> near as I can tell, the part number should have actually been
>> H5PS1G63EFR instead of HSPS1G3EFR. The Newark page is here:
>>
>> http://www.newark.com/hynix-semiconductor/h5ps1g63efr-s6c/sdram-ddr2-...
>>
>> --
>> roger ivie
>> ri...@ridgenet.net
>
>Thanks for the clarification.
>
>This is a DDR2 device using SSTL logic level interfaces, not supported
>by the GA144.  I am not interested in analyzing this with the GA144 to
>see if it can be kludged.  I don't think the GA144 data sheet provides
>enough info.  I'll take a look at SDRAM and DDR when I get a chance.

I did an investigation.

I hope www.digikey.us works the same as www.digikey.nl.

Okay there we go.
We start with selecting an arbitrary memory supplier, so we are not
bothered with other components: ISS.
Then narrow it down to memory. They supply merely 1200 types ( ;-).

Lets have a look what they have in the popular 16M x 16 category,
i.e. 32 Mbyte.
That narrows it down to 64 chip types.

Lets select the same voltage as the GA144: 1.7 .. 1.9
706-1127-ND            digikey part number
IS43DR16160A-xxx       supplier part number

Download the datasheet.
I see what you meant. We are out of luck, 4 differential inputs.
I am afraid that most newer chips with attractive capacities have
such an interface.

This is what I found with only the clock as a differential input.

706-1144-ND    Digikey
IS43R16160B    ISS

60 pin bga 8*13   mm
TSOP-2     12*22  mm

I have studied this in some detail:

1. Why does it bother you to have a TSOP-2 package, when
the pin spacing is more than that of the GA144?
If that demands 4 mil, so does the GA144.

2. I see the term STTL-2. That is not a reference, as
the data sheet is self contained. I see there is a differential
clock input, but that is the only differential input.
If we put CLK and ~CLK on the same output word, it should be okay.
It costs one extra pin, so be it.

3. This chip still works at 2.3 V. I don't expect problems with
direct interfacing, do you?

4. It seems that burst length can be kept to 2.
If set to 2 permanently, we would have obligatory 32 bit
access, not bad.

5. The GA144 is well equipped to read on both edges of DQS.
It can wait for a signal to go up, as well as go down.

6. There is a total of 18 bidirectional wires. 16 databits and 2
strobes, a good match for the GA144.

The IS43R16320B is even slightly more attractive, except for the package.
It differs with the 16160 in voltage, works on 1.8V and has a
64 mbyte capacity. Only disadvantage : only available in BGA.
This is the digikey part number:
    706-1142-ND
It is about twice as expensive, for twice the amount of RAM.

This type of memory is called "DDR SDRAM". It seems that we have
to stay away from "DDR2 SDRAM". Okay, you told so.

This is two orders of magnitude better than the evaluation board.

Caveat: I only investigated one supplier and I'm not an expert.

>
>Rick

Groetjes Albert

--
-- 
Albert van der Horst, UTRECHT,THE NETHERLANDS
Economic growth -- being exponential -- ultimately falters.
albert@spe&ar&c.xs4all.nl &=n http://home.hccnet.nl/a.w.m.van.der.horst

Back to comp.lang.forth | Previous | Next — Previous in thread | Next in thread | Find similar

Thread

Re: GA144 Application Board Paul Rubin <no.email@nospam.invalid> - 2012-03-14 19:53 -0700
  Re: GA144 Application Board rickman <gnuarm@gmail.com> - 2012-03-20 20:15 -0700
    Re: GA144 Application Board Albert van der Horst <albert@spenarnc.xs4all.nl> - 2012-03-21 13:08 +0000
      Re: GA144 Application Board rickman <gnuarm@gmail.com> - 2012-03-21 12:13 -0700
        Re: GA144 Application Board Albert van der Horst <albert@spenarnc.xs4all.nl> - 2012-03-22 11:36 +0000
          Re: GA144 Application Board Albert van der Horst <albert@spenarnc.xs4all.nl> - 2012-03-22 17:50 +0000
            Re: GA144 Application Board rickman <gnuarm@gmail.com> - 2012-03-22 14:50 -0700
              Re: GA144 Application Board Albert van der Horst <albert@spenarnc.xs4all.nl> - 2012-03-23 12:24 +0000
                Re: GA144 Application Board rickman <gnuarm@gmail.com> - 2012-03-23 10:11 -0700
                Re: GA144 Application Board Roger Ivie <rivie@ridgenet.net> - 2012-03-23 13:15 -0500
                Re: GA144 Application Board rickman <gnuarm@gmail.com> - 2012-03-24 11:51 -0700
                Re: GA144 Application Board Albert van der Horst <albert@spenarnc.xs4all.nl> - 2012-03-25 12:06 +0000
                Re: GA144 Application Board rickman <gnuarm@gmail.com> - 2012-03-25 12:50 -0700
                GA144 memory interfacing was Re: GA144 Application Board Albert van der Horst <albert@spenarnc.xs4all.nl> - 2012-03-26 13:00 +0000
                Re: GA144 memory interfacing was Re: GA144 Application Board rickman <gnuarm@gmail.com> - 2012-03-26 20:03 -0700
                Re: GA144 memory interfacing was Re: GA144 Application Board Albert van der Horst <albert@spenarnc.xs4all.nl> - 2012-03-28 12:21 +0000
                Re: GA144 memory interfacing was Re: GA144 Application Board Paul Rubin <no.email@nospam.invalid> - 2012-03-28 07:59 -0700
          Re: GA144 Application Board rickman <gnuarm@gmail.com> - 2012-03-22 14:26 -0700
        Re: GA144 Application Board hwfwguy@gmail.com - 2012-03-22 12:25 -0700
          Re: GA144 Application Board Paul Rubin <no.email@nospam.invalid> - 2012-03-22 13:07 -0700
            Re: GA144 Application Board rickman <gnuarm@gmail.com> - 2012-03-22 14:54 -0700
              Re: GA144 Application Board Paul Rubin <no.email@nospam.invalid> - 2012-03-22 15:00 -0700
                Re: GA144 Application Board rickman <gnuarm@gmail.com> - 2012-03-23 10:15 -0700
                Re: GA144 Application Board Paul Rubin <no.email@nospam.invalid> - 2012-03-23 17:32 -0700
                Re: GA144 Application Board rickman <gnuarm@gmail.com> - 2012-03-24 12:01 -0700
                Re: GA144 Application Board Jan Coombs <jan_2011-02@murray-microft.co.uk> - 2012-03-24 22:27 +0000
                Re: GA144 Application Board rickman <gnuarm@gmail.com> - 2012-03-24 19:13 -0700
                Re: GA144 Application Board Paul Rubin <no.email@nospam.invalid> - 2012-03-24 16:01 -0700
                Re: GA144 Application Board rickman <gnuarm@gmail.com> - 2012-03-24 19:18 -0700
                Re: GA144 Application Board Paul Rubin <no.email@nospam.invalid> - 2012-03-25 13:06 -0700
                Re: GA144 Application Board rickman <gnuarm@gmail.com> - 2012-03-25 15:02 -0700
                Re: GA144 Application Board Paul Rubin <no.email@nospam.invalid> - 2012-03-25 15:51 -0700
                Re: GA144 Application Board rickman <gnuarm@gmail.com> - 2012-03-25 16:38 -0700
          Re: GA144 Application Board Richard Owlett <rowlett@pcnetinc.com> - 2012-03-22 16:54 -0500
            Re: GA144 Application Board rickman <gnuarm@gmail.com> - 2012-03-23 10:17 -0700
          Re: GA144 Application Board rickman <gnuarm@gmail.com> - 2012-03-22 14:52 -0700
          Re: GA144 Application Board Albert van der Horst <albert@spenarnc.xs4all.nl> - 2012-03-23 12:34 +0000
            Re: GA144 Application Board rickman <gnuarm@gmail.com> - 2012-03-23 10:24 -0700
          Re: GA144 Application Board Albert van der Horst <albert@spenarnc.xs4all.nl> - 2012-03-23 14:22 +0000
    Re: GA144 Application Board Paul Rubin <no.email@nospam.invalid> - 2012-03-22 08:12 -0700
      Re: GA144 Application Board Albert van der Horst <albert@spenarnc.xs4all.nl> - 2012-03-23 12:38 +0000
    Re: GA144 Application Board Paul Rubin <no.email@nospam.invalid> - 2012-03-22 08:52 -0700
      Re: GA144 Application Board rickman <gnuarm@gmail.com> - 2012-03-22 15:00 -0700

csiph-web