Spartan/SpartanXL Device Selection

[Naimesh]

I need to use spartan series FPGA for a design.( As design have only 5
V supply available). when I start a new project in XILINX ISE 6.1 I
dont get option of Spartan in Device selection list. can anyone help
me out. which software do I need.

Thanks for any help

 

[Greg Neff]

On 21 Jun 2004 04:06:06 -0700, t_naimesh@rediffmail.com (Naimesh)
wrote:

I need to use spartan series FPGA for a design.( As design have only 5
V supply available). when I start a new project in XILINX ISE 6.1 I
dont get option of Spartan in Device selection list. can anyone help
me out. which software do I need.

Thanks for any help

Although Xilinx does sell most Spartan and SpartanXL devices still
(except those in PC84 and CSxxx packages), you have to use ISE 4.1 to
work with those families.


================================

Greg Neff
VP Engineering
*Microsym* Computers Inc.
greg@guesswhichwordgoeshere.com

 

[John_H]

Consider shelling out the cash for a regulator (about 69 cents?) and use one
of the new - read this as "inexpensive" - Xilinx devices. The
functionality, capability, and support are all superior to the older
devices. If you have 5V interface concerns, know that the LVTTL I/O format
easily drive 5V logic and compliance with >3.3V inputs can be achieved with
a series resister per Xilinx recommendations. It's such a good way to go.

"Naimesh" <t_naimesh@rediffmail.com> wrote in message
news:ecee4f8a.0406210306.3bea9972@posting.google.com...

I need to use spartan series FPGA for a design.( As design have only 5
V supply available). when I start a new project in XILINX ISE 6.1 I
dont get option of Spartan in Device selection list. can anyone help
me out. which software do I need.

Thanks for any help

 

[Brian Philofsky]

Greg Neff wrote:

Although Xilinx does sell most Spartan and SpartanXL devices still
(except those in PC84 and CSxxx packages), you have to use ISE 4.1 to
work with those families.

Also, it can be downloaded at no cost from:
http://www.xilinx.com/webpack/classics/index.htm


You do have to provide a design entry (synthesis) tool however as that
is not included.

I also agree that it is much better to use a newer device if possible
however.

-- Brian

 

[Naimesh]

Is it possible to interface both CMOS and TTL devices to a 3.3 V
device? This is because I have to replaced a SOC on the alreay
designed board and dont want to change the design too much.

 

[John_H]

74HCT series logic, for instance, is CMOS yet fully compatible with the 3.3V
interface as long as the series resistors are used on the inputs (or I/Os).
The 74HCT input levels are specified for TTL levels. The big question is
what are the logic level requirements that you're interfacing with?

Don't expect to replace a SYSTEM on a chip with a Spartan/SpartanXL. Have
you checked out the densities of those old devices?

"Naimesh" <t_naimesh@rediffmail.com> wrote in message
news:ecee4f8a.0406211935.6d22115c@posting.google.com...

Is it possible to interface both CMOS and TTL devices to a 3.3 V
device? This is because I have to replaced a SOC on the alreay
designed board and dont want to change the design too much.

 

[Naimesh]

Thanks for the help. I've decided to go for Spartan II now. saw the
price difference between Spartan and Spartan II.


"John_H" <johnhandwork@mail.com> wrote in message news:<ugYBc.13$I25.1709@news-west.eli.net>...

74HCT series logic, for instance, is CMOS yet fully compatible with the 3.3V
interface as long as the series resistors are used on the inputs (or I/Os).
The 74HCT input levels are specified for TTL levels. The big question is
what are the logic level requirements that you're interfacing with?