EEPROMs & more....

Vaati

I was wondering whether this·would work as an EEPROM for the prop...· I didn't know whether there was a limit to the external memory, like in the case of the stamp modules...

Also, where it says the memory organization (in the given link, 128k x 8) does that mean that there is 1M memory available for use, or 128k?· I have a few 2k x 8 SRAMs, so they would technically be 16k?


Thanks.

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Quit buying all those fixed voltage regulators, and·get an Adjustable Power Supply·for your projects!· Includes an LED testing terminal!

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Cluso99

The prop will only access the lower 32KB without special software (which has been done). Normally, we use the AT24C256, AT24C512 and AT24C1024 which are 32KB, 64KB 1n3 128KB respectively. You can daisy chain 4 x 24C256, or 2 x 24C512 or 1 x 24C1024.

The 24C1025 begins a new set of daisy chaining. I haven't looked closely at it's specs to see if it will work.

128K x 8 means 128KBytes or 1024Kbits (=1Mbits). I think you are confusing bytes and bits. Yes, your 2Kx8 SRAMs are 16Kbits or 2KBytes. Note the upper and lower case B.

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Links to other interesting threads:

· Home of the MultiBladeProps: TriBladeProp, RamBlade, TwinBlade,·SixBlade, website
· Single Board Computer:·3 Propeller ICs·and a·TriBladeProp board (ZiCog Z80 Emulator)
· Prop Tools under Development or Completed (Index)
· Emulators: Micros eg Altair, and Terminals eg VT100 (Index) ZiCog (Z80), MoCog (6809)
· Search the Propeller forums (via Google)
My cruising website is: ·www.bluemagic.biz·· MultiBladeProp is: www.bluemagic.biz/cluso.htm

Vaati

Does that mean it's basically pointless to buy an eeprom with more than 32k, because you would only be able to use 32k of it?

So, what "special software" is required to use more than the lower 32k?


Thanks.

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Quit buying all those fixed voltage regulators, and·get an Adjustable Power Supply·for your projects!· Includes an LED testing terminal!

*-NEW-* SD Card Adapter·Now available!· Add extra memory to your next Propeller project with ease!

Mike Green

There are several I2C driver objects in the Object Exchange. Any of them would work: "Basic I2C Driver", "BS2 Functions", "Enhanced I2C", "i2cObjectV2". FemtoBasic and its derivatives can store programs and data in the extra EEPROM. You can attach up to 512K to a pair of I/O pins (64K x 8 or 128K x 4).

Vaati

Hmmmm... So I could have two eeproms? One in the standard spot and another on any desired I/O's?

The thing is, I'm making a propstick kit, so I wanted to be sure about an eeprom before I solder it down...


Thanks.

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Quit buying all those fixed voltage regulators, and·get an Adjustable Power Supply·for your projects!· Includes an LED testing terminal!

*-NEW-* SD Card Adapter·Now available!· Add extra memory to your next Propeller project with ease!

Mike Green

I have a Demo Board with 4 EEPROMs connected to I/O pins 6 and 7 (since you can't really get to I/O pins 28 and 29) to provide 512K of EEPROM (4 x Atmel 24C1024B)

Vaati

Wow! Well, I just found out that I can socket the eeprom in the propstick kit, so no worries.

Thanks for the help.

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Quit buying all those fixed voltage regulators, and·get an Adjustable Power Supply·for your projects!· Includes an LED testing terminal!

*-NEW-* SD Card Adapter·Now available!· Add extra memory to your next Propeller project with ease!