On Oct 3, 8:39=A0am, "abrous" <abrous3d@n_o_s_p_a_m.hotmail.com> wrote:
> Hi guys,
>
> I am designing a new Stellaris based (LM3S9B92) platform for a POS
> project.
> Stellaris looked the best way to go for me (small package,MAC+PHY!!,easy =
to
> start ROM libraries,reputable manufacturer and good price),I ran very
> quickly out of i/o's. I was thinking about to use as a companion chip my
> old faithful ATF1504 CPLD, but ATMEL has disappointed me lately with its
> policy and prices to smaller customers. My requirements are very simple -=
 a
> mem mapped device for I/O port expansion and that's all. Every 64
> macrocell/64 - 100 pin device would do. My main concern is the price and
> availability. Since I am not familiar with with the policies of the vario=
us
> CPLD manufacturers could you give me some directions ?
> Which is the best way to go ? (Altera, Xilinx, Lattice) and which is the
> more common used CPLD families ?
>
> Thanks in advance,
>
> Angelo
>
> --------------------------------------- =A0 =A0 =A0 =A0
> Posted throughhttp://www.EmbeddedRelated.com

Without a speed requirement your question is nonsence. Without a
volume requirement, your price/availability concern is nonsence as
well. You could allways google "shift register" and save everyone alot
of time and effort.

On Oct 3, 8:39=A0pm, "abrous" <abrous3d@n_o_s_p_a_m.hotmail.com> wrote:
 I was thinking about to use as a companion chip my
> old faithful ATF1504 CPLD, but ATMEL has disappointed me lately with its
> policy and prices to smaller customers.

What issues did you hit with ATF1504, as it shows as being widely
available ?
There is also ATF1508ASx/ATF1508BE/ATF1508RE in 100pins, and in 44
pins, the ATF1502 too .

Alternatives would be XC2C64 and LC2064, but the Atmel parts have
better logic density, well suited to IO expanders.

If it is a fixed IO mix, then simple shift registers are still hard to
beat.
i2c expanders are more costly.

-jg

On Oct 4, 5:23=A0am, Mike Harrison <m...@whitewing.co.uk> wrote:
>
> An external low-end PIC/AVR/whatever is another option for IO expansion

I've never done a price tradeoff to see if adding multiple MCUs is
cheaper than using one with a larger pin count.  As the pin count goes
up, they typically provide more peripherals, more Flash, more RAM,
etc, so I would think multiple MCUs could be less expensive.  But it
is more work getting the extra software written and debugged.  But
once you write an I/O expander function, it should be reusable.

Rick

On Sun, 3 Oct 2010 10:11:11 -0700 (PDT), rickman <gnuarm@gmail.com> wrote:

>On Oct 3, 3:39&#4294967295;am, "abrous" <abrous3d@n_o_s_p_a_m.hotmail.com> wrote:
>> Hi guys,
>>
>> I am designing a new Stellaris based (LM3S9B92) platform for a POS
>> project.
>> Stellaris looked the best way to go for me (small package,MAC+PHY!!,easy to
>> start ROM libraries,reputable manufacturer and good price),I ran very
>> quickly out of i/o's. I was thinking about to use as a companion chip my
>> old faithful ATF1504 CPLD, but ATMEL has disappointed me lately with its
>> policy and prices to smaller customers. My requirements are very simple - a
>> mem mapped device for I/O port expansion and that's all. Every 64
>> macrocell/64 - 100 pin device would do. My main concern is the price and
>> availability. Since I am not familiar with with the policies of the various
>> CPLD manufacturers could you give me some directions ?
>> Which is the best way to go ? (Altera, Xilinx, Lattice) and which is the
>> more common used CPLD families ?
>
>I almost forgot.  There are SPI and I2C I/O expander chips out there
>that are pretty inexpensive, up to 16 bits of I/O for $1 or $2.
>
>Rick

And don't forget the good old 74HC595 for output expansion at about $0.30 for 8 lines. 

An external low-end PIC/AVR/whatever is another option for IO expansion

On Oct 3, 3:39=A0am, "abrous" <abrous3d@n_o_s_p_a_m.hotmail.com> wrote:
> Hi guys,
>
> I am designing a new Stellaris based (LM3S9B92) platform for a POS
> project.
> Stellaris looked the best way to go for me (small package,MAC+PHY!!,easy =
to
> start ROM libraries,reputable manufacturer and good price),I ran very
> quickly out of i/o's. I was thinking about to use as a companion chip my
> old faithful ATF1504 CPLD, but ATMEL has disappointed me lately with its
> policy and prices to smaller customers. My requirements are very simple -=
 a
> mem mapped device for I/O port expansion and that's all. Every 64
> macrocell/64 - 100 pin device would do. My main concern is the price and
> availability. Since I am not familiar with with the policies of the vario=
us
> CPLD manufacturers could you give me some directions ?
> Which is the best way to go ? (Altera, Xilinx, Lattice) and which is the
> more common used CPLD families ?

I almost forgot.  There are SPI and I2C I/O expander chips out there
that are pretty inexpensive, up to 16 bits of I/O for $1 or $2.

Rick

On Oct 3, 3:39=A0am, "abrous" <abrous3d@n_o_s_p_a_m.hotmail.com> wrote:
> Hi guys,
>
> I am designing a new Stellaris based (LM3S9B92) platform for a POS
> project.
> Stellaris looked the best way to go for me (small package,MAC+PHY!!,easy =
to
> start ROM libraries,reputable manufacturer and good price),I ran very
> quickly out of i/o's. I was thinking about to use as a companion chip my
> old faithful ATF1504 CPLD, but ATMEL has disappointed me lately with its
> policy and prices to smaller customers. My requirements are very simple -=
 a
> mem mapped device for I/O port expansion and that's all. Every 64
> macrocell/64 - 100 pin device would do. My main concern is the price and
> availability. Since I am not familiar with with the policies of the vario=
us
> CPLD manufacturers could you give me some directions ?
> Which is the best way to go ? (Altera, Xilinx, Lattice) and which is the
> more common used CPLD families ?

I have been using the Lattice XP family which has a 3 kLUT part in a
100 pin QFP package (62 IOs).  It has internal configuration Flash so
you don't need to use flash in your MCU.  I can get this for under $10
in qty 100 which is very competitive.  I think when I have posted
about this being the most cost effective FPGA I can find, others have
posted parts that are similar, but not better that I recall.  Lattice
is stocked by Mouser and is easy to use.  I think you have to pay for
a version of their tools that includes a simulator, but a base version
is free.

Si Blue has some pretty nice parts when it comes to package and price,
but I can't say how real they are.  If you look into this company,
please report back here what you find.

Rick

On 3 Oct, 08:39, "abrous" <abrous3d@n_o_s_p_a_m.hotmail.com> wrote:
> Hi guys,
>
> I am designing a new Stellaris based (LM3S9B92) platform for a POS
> project.
> Stellaris looked the best way to go for me (small package,MAC+PHY!!,easy =
to
> start ROM libraries,reputable manufacturer and good price),I ran very
> quickly out of i/o's. I was thinking about to use as a companion chip my
> old faithful ATF1504 CPLD, but ATMEL has disappointed me lately with its
> policy and prices to smaller customers. My requirements are very simple -=
 a
> mem mapped device for I/O port expansion and that's all. Every 64
> macrocell/64 - 100 pin device would do. My main concern is the price and
> availability. Since I am not familiar with with the policies of the vario=
us
> CPLD manufacturers could you give me some directions ?
> Which is the best way to go ? (Altera, Xilinx, Lattice) and which is the
> more common used CPLD families ?
>
> Thanks in advance,
>
> Angelo
>
> --------------------------------------- =A0 =A0 =A0 =A0
> Posted throughhttp://www.EmbeddedRelated.com

I'd use a bigger ARM chip. However, I like the Altera MAX II CPLDs.
The software is easier to use than Xilinx's, and they seem to do more
development with their devices than the latter.

Hi guys,

I am designing a new Stellaris based (LM3S9B92) platform for a POS
project.
Stellaris looked the best way to go for me (small package,MAC+PHY!!,easy to
start ROM libraries,reputable manufacturer and good price),I ran very
quickly out of i/o's. I was thinking about to use as a companion chip my
old faithful ATF1504 CPLD, but ATMEL has disappointed me lately with its
policy and prices to smaller customers. My requirements are very simple - a
mem mapped device for I/O port expansion and that's all. Every 64
macrocell/64 - 100 pin device would do. My main concern is the price and
availability. Since I am not familiar with with the policies of the various
CPLD manufacturers could you give me some directions ?
Which is the best way to go ? (Altera, Xilinx, Lattice) and which is the
more common used CPLD families ?

Thanks in advance, 

Angelo
      	   
					
---------------------------------------		
Posted through http://www.EmbeddedRelated.com