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Dany0020at
Joined: 31 Aug 2004
Posts: 5
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 16 Dec 2008 20:01 sdtnllchsm-8192 |
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Hello,
Does anybody know some specs or has experiences with the "SDTNLLCHSM-8192" Nand-Flash Chip from SanDisk.
It is embedded in a Sansa-Fuze (a digital audio player from SanDisk) and is linked to a ARM-SoC (based on a AS3525 from AMS) over its SD (SecureDisc) Interface.
Pictures of the Flash and the DAP: flickr
The Rockbox-Team is currently working on porting a free firmware-replacment for the fuze.
We are currently able to initialize the flash correctly and read/write data to it - but only below ~1GByte. If we try to read data from >1GB the flash does not respond and a data-timeout occurs...
Does anybody know of a compareable (which uses a SD-interface) flash-chip so that we might find any documentation?
I (and the RockBox-Team) would be very glad, if someone could provide further informations.
Thx
Daniel
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FvM
Joined: 22 Jan 2008
Posts: 5160
Helped: 767
Location: Bochum, Germany
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18 Dec 2008 7:46 sdtnllchsm |
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| How can you know, if the memory has a SD interface? I doubt.
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Dany0020at
Joined: 31 Aug 2004
Posts: 5
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18 Dec 2008 9:23 sd nand flash |
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> How can you know, if the memory has a SD interface? I doubt.
We are currently "talking" to the flash over the SD interface from the ARM-SoC. And there are no other components on the PCB which could work as a interface-driver.
Also it would be strange that the designer would use the SD-interface of the SoC, as it also has a NAND-Interface if they would need a additional interface IC.
As I said, it works... but only up to the fist GB. Seems like we need to a page-switch function or kind of... But the SD-protocol does not specify such a function.
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FvM
Joined: 22 Jan 2008
Posts: 5160
Helped: 767
Location: Bochum, Germany
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18 Dec 2008 9:45 sd interface chip |
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I see. I just saw, that the flash has many pins, I guessed, it would be a regular NAND flash. So it's a flash with integrated
SD controller. Sandisk is advertising a family of iNAND devices, the part may belong to it.
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