Intégrité du signal ESP32/SDIO (SDCARD)

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qu'on trouvais bizarre depuis quelque temps et qui est celui de  

SDIO) avec Fclk40%MHz).


fichiers FAT32 non consistant i.e. avec pleins d'erreurs sur fichiers).




IL FAUT ABSOLUMENT que les signaux SDIO : CMD, CLK et DATA0 soient  








https://www.cjoint.com/c/KBzroqDZpFk
https://www.cjoint.com/c/KBzrpyv5Hhk
https://www.cjoint.com/c/KBzrpZySKQk




H

PS.
Je pars en we l'esprit tranquille car je ne commence jamais une manip un  


Re: Intégrité du signal ESP32/SDIO (SDCARD)
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Re: Intégrité du signal ESP32/SDIO (SDCARD)


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    avec une SDcard, mais avec un module Wifi de TI au bout) parce que...












    plus. Il fallait cette capa sur une et une seule ligne (n'importe laquelle).



    JKB

--  
Si votre demande me parvient en code 29, je vous titiouillerai volontiers


Re: Intégrité du signal ESP32/SDIO (SDCARD )



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Joel,




https://forums.xilinx.com/t5/Processor-System-Design-and-AXI/ZYNQ-eMMC-SDIO-errors-Timing-or-Signal-Integrity-issue/td-p/742464




rendre compte des rebonds terribles ... ! Je pense sans en avoir la  


Je ne pensais pas qu'on aurait pu avoir ce genre de choses sur du SDIO  
... mais manifestement c'est possible.

H




Re: Intégrité du signal ESP32/SDIO (SDCARD)

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    au milieu de la doc).


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    certains designs alors qu'il n'y a a priori aucune raison.
    C'est encore pire lorsque tu as au milieu du bus un truc pour changer les

    violemment les signaux en forme !).





    Bien cordialement,

    JKB

--  
Si votre demande me parvient en code 29, je vous titiouillerai volontiers


Re: Intégrité du signal ESP32/SDIO (SDCARD )


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doc en page pp.2  
(https://www.prodigytechno.com/resources/HAPA-eMMC-SD/SDIO-App_Note_V1.pdf )  


du 40MHz dans ce mode en 3v3 ... c'est un de nos gars qui me l'as fait  
remarquer et c'est bien vu.


signaux SDIO soient des "tuyaux microstrips" qui atteignent la bande  
passante BW = 0.35/tr ; ce que l'utilitaire de KiCAD me donne bien !





sonde du scope au plus court sur le PCB (genre queue de cochon)




H

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PS.
Je n'ai pas le temps de lire la spec SDIO SDCARD

Re: Intégrité du signal ESP32/SD IO (SDCARD)

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la suivante :











du chip.

Voir par exemple la figure 6 ici :  
https://www.analog.com/media/cn/training-seminars/tutorials/MT-097.pdf





terminations", Circuit Cellar 309 - Avril 2016). Minute de pub : On aborde  

rapides", cf https://alciom.catalogueformpro.com/

Bien cordialement,

Robert Lacoste
ALCIOM - The mixed signal experts - www.alciom.com



Re: Intégrité du signal ESP32/SDIO (SDCARD )



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Bonjour Robert,
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Le run-1 je le laisse tomber pour les mesures ...


que l'on trouve dans cette datasheet
https://assets.nexperia.com/documents/data-sheet/IP4251_52_53_54-TTL.pdf

et dans cette app note

https://assets.nexperia.com/documents/application-note/AN10911.pdf











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les I/O DATA et CMD sont bidir comme dans la figure 7 de l'app note AD



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Cdt, H

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ESP32 --> SD Card

En mode SD 1-bit en 3v3 avec Fclk40%MHz ; Les perfs sont de l'ordre de  







H

Re: Intégrité du signal ESP32/SDIO (SDCARD )




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H. (H)ourra !

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