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'[SX] Which RAM for a small frame buffer (8KB)'
2005\12\08@094254 by inakin/a

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, inaki wrote:

I need to add some RAM to a SX project.
The space I need is about 8KB. It is intended to be used as a 8KB frame buffer for a printer.

The CPU would be a SX48 although I would like also to work with a SX28.


In your opinion/experience which would be a suitable RAM to use ?

I would like to take as few pins as possible.

Speed is not a concern here but the fastest the better.  :smilewinkgrin:

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2005\12\08@102509 by Coriolisn/a

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Coriolis wrote:

Ramtron's FRAM.

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2005\12\08@103132 by Jon Williamsn/a

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Jon Williams wrote:

Terry Hitt (Bean) is working on a project that uses a 32K RAM connected directly to an SX48 -- perhaps he'll share details.

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2005\12\08@104559 by beann/a

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, bean wrote:

inaki,
 Yeah I'm working on a project that uses the cypress CY62256 chip. But it requires 26 I/O pins. I'm using the SX48 clocked at 4Mhz (for low power). It's was pretty easy to use. It is 70nSec so a 4Mhz I just need one NOP delay to access it. You can get them from digikey for $3.40 each
Bean.

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2005\12\08@105156 by Coriolisn/a

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Coriolis wrote:

The cypress memory is indeed very good, its cheap fast and large. I didn't meantion them because they require so many pins, for 8K unmultiplexed addressing youll need: 8 data, 13 address, plus control (2-3 pins) for a total of 23-24 pins, by no means a "few pins" solution.

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2005\12\08@111550 by Chris Savagen/a

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Chris Savage wrote:

Terry,
  Is that chip a 32K SRAM?  I recognize the 62256 from 32K SRAMs I used in the Z80 days an assume it's the same configuration.

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2005\12\08@111644 by beann/a

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, bean wrote:

Paul,
 Your right about the ungodly number of pins required. I have no experience with the Ramtron parts, but one of these days I hope to experiment with them (plus they are non-volatile). I need to use a slow clock for power reasons so a serial ram would be a little slow for my project.

Bean.

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2005\12\08@112531 by Chris Savagen/a

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Chris Savage wrote:

Okay, yeah I checked the link and was verifying the configuration.

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2005\12\08@115514 by Coriolisn/a

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Coriolis wrote:

I got some samples of the 32K serial, and they were sending me the parallel 128K chip, but they neglected to write my apartment number on the address so it showed up as a delivery exception w/ FedEX, after the second delivery attempt FedEx called Ramtron who in turn instructed FedEx to destroy the package 2 hours before I went to go pick up the package! grrr. I don't know if I want to wait another 6+ months for a new sample with the chance they'll screw up my address again.

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2005\12\08@130729 by inakin/a

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, inaki wrote:

I think a serial solution would be better for my needs, 26 pins is too much.

In the RAMTRON site there are two flavors of serial: serial 'two wires' and SPI.

Then there are 2.8V, 3V an 5V, each with different packages.

Paul, which one did you try with the SX ?

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2005\12\08@133656 by Coriolisn/a

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Coriolis wrote:

FM25256  256Kb 8SOIC 15MHz 4.0V-5.5V SPI
The FM25640 is the 8K version of the same chip (its bus speed is 5MHz)
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2005\12\08@153730 by Chris Savagen/a

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Chris Savage wrote:

Paul,
  You've probably posted this before, but what is the part number of the serial version of the 32K RAM chip you used/ordered?  Thanks.

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2005\12\08@154604 by Coriolisn/a

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Coriolis wrote:

ROFL thanks Chris you just made my day, its the first line of the post just before yours :)))
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