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Raspberry Pi 4 SD-interface maximum clock frequency?

Posted: Mon Apr 20, 2020 6:11 pm
by lingon
According to this block diagram of the BCM2711 (in german) the SD-interface on the Raspberry Pi 4 is designated as DDR50. Is the Arasan SDIO capable of running at higher frequencies like 100 MHz or 208 MHz or is it limited to 50 MHz maximum?

Is the block diagram an accurate representation of the BCM2711 or are there some errors in the diagram?

Image

Re: Raspberry Pi 4 SD-interface maximum clock frequency?

Posted: Mon Apr 20, 2020 6:41 pm
by Ernst
Please rephrase your question after reading (and understanding) all the posts in this thread:viewtopic.php?f=29&t=256931

Re: Raspberry Pi 4 SD-interface maximum clock frequency?

Posted: Wed Apr 22, 2020 2:22 pm
by lingon
Thanks for pointing out the thread from last November. I had not read it previously. I'm curious to know if the SD-interface on the Raspberry Pi 4 can run at 104 MHz or not. If not then I'm curious to know where the hardware limitation is that restricts the clock frequency to 50 MHz.

Re: Raspberry Pi 4 SD-interface maximum clock frequency?

Posted: Wed Apr 22, 2020 5:43 pm
by Ernst
lingon wrote:
Wed Apr 22, 2020 2:22 pm
Thanks for pointing out the thread from last November. I had not read it previously. I'm curious to know if the SD-interface on the Raspberry Pi 4 can run at 104 MHz or not. If not then I'm curious to know where the hardware limitation is that restricts the clock frequency to 50 MHz.
Why ? viewtopic.php?t=244416#p1510284

Re: Raspberry Pi 4 SD-interface maximum clock frequency?

Posted: Thu May 07, 2020 1:12 am
by twrpi
I have increased the frequency on the bus of my SD card to 208 MHz through system adjustments.
Unfortunately, the system is unstable in such a situation. It will lead to a system crash (required to reboot) or fail to write after hours. :?

Re: Raspberry Pi 4 SD-interface maximum clock frequency?

Posted: Thu May 07, 2020 3:08 pm
by jdb
twrpi wrote:
Thu May 07, 2020 1:12 am
I have increased the frequency on the bus of my SD card to 208 MHz through system adjustments.
How?