On 2024-01-26 12:09, Quentin Schulz wrote:
On 1/26/24 12:04, Dragan Simic wrote:
On 2024-01-26 11:37, Quentin Schulz wrote:
On 1/26/24 03:57, Kever Yang wrote:
On 2024/1/25 19:02, Quentin Schulz wrote:
We don't have a dedicated CD pin for the SD card connector. https://www.digikey.com/en/products/detail/molex/0472192001/3044807 is the SD card connector we use.
Thanks for your information, but I think you are using the wrong microSD connector for rk3588 and maybe also for other rockchip SoCs. Here are four microSD card connector from the web you provide, all of them have card detect signal available for pcb: https://www.digikey.com/en/product-highlight/m/molex-connector/sd-memory-car...
None of those fit our requirements. We need a safe system that doesn't break because of vibrations or shocks. Push-pull connectors are out of question for our design. We have had issues with our Q7 devkit with push-pull connector with SD cards slightly smaller or inserted somewhat the wrong way. I can recall also countless of discussions in the early days of the Raspberry Pis where there were a lot of issues related to SD cards.
This is basically the mechanism we are using https://media.distrelec.com/Web/WebShopImages/landscape_large/4-/01/Molex-50...
Please, allow me to interject... I'm really curious why don't you use eMMC chips instead of microSD cards? I mean, if the reliability is of utmost importance, I wouldn't even consider microSD cards, not even the high-endurance variants.
We have both :)
Ah, I see. :) Perhaps my question wasn't precise enough; actually, now I'd like to know what do you use as the primary storage for the operating system installation -- eMMC chip or microSD cards? Is the eMMC chip soldered? I'm just curious. :)
Just to name one potential use-case, you may want to save some data on SD card for investigation without the need for the system to run to dump data from the eMMC. It's there anyway, so now my job as a SW guy is to support it :)
Sure, it needs to be supported, no matter what. The microSD slot is presumably there to be used as the secondary storage, or to perform operating system rescue, debugging and similar operations, as needed.