Re: 16 MB REU clone

From: Marko Mäkelä (
Date: 2001-08-22 14:39:06

On Wed, 22 Aug 2001, Ruud Baltissen wrote:

[quote for the Micron 16-megabyte SDRAM chips]
> $6.00 for 25 pieces, no VAT

Not bad.  On the Xilinx web site, you can find application note 134, which
provides an example of controlling a 16-megabit (1 Mb*16) Micron SDRAM
chip with a Xilinx Spartan-II family logic chip.

I checked the Atmel site.  The AT17LV256 (datasheet available from is an in-system
programmable FPGA configuration EEPROM chip that could be used with the
Xilinx chip.  It appears that the SRAM-based programmable logics from
Atmel cannot be used in mixed 5V and 3.3V operation, but the Xilinx chip
could be used.

Does anyone (Rainer?) have experience in designs like this?  If the total
cost of parts is less than $20 or $30, I think that it would be feasible
to build a 16 MB REU clone (possibly including some Flash ROM, such as the
Am29LV640 that provides 8 megabytes).  When all parts are in-system
programmable, the first prototypes could omit most of the planned
features, and the VHDL code could be written as a joint project.  The
entire design would be open-source, of course.


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