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D600 SD memory card speeds

dagoldst

Little Rock, US
3075 posts

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"RE: D600 SD memory card speeds"

dagoldst Gold Member Nikonian since 02nd Dec 2012
Sat 03-Aug-13 10:04 PM


>Correct. However, a DDR50 mode allows to transfer these 4 bits
>two times per clock cycle (during signal rise and fall). Not
>sure if this is used in this case though.

Yep, but this is NOT the DDR50 version of the chip according to the spec sheet. I read it closely for the TE4307RXPF, (the chip in the teardown picture). Also, Inrevium does not speak to overclocking the chip.

>More importantly, there is one important part behind the SDIO
>interface - a flash memory chip. In real wold is is the memory
>chip that defines the real-world performance of a SD card, not
>the SDIO signalling speed.

I don't believe the camera flash would be relevant. The clock signal is sent on pin 5 to the SD cards by the SDIO chip and the chip has the smarts, (ie, its own firmware), to determine what kind of card it is talking to. It gets a base clock signal of 25Mhz and has its own clock multipliers that it controls based in the card it sees plugged in. The image below is a basic block diagram.


Click on image to view larger version




>No, the results are repeatable. I can consistently take 17
>extra RAW frames when having the shutter button pressed for
>30s burst with Lexar 90mb/s card compared to 45mb/s. When
>repeating the error is maximum 1 frame.

So to be clear, you are holding down the shutter button, waiting and counting frames for the buffer to fill and timing the results with a stopwatch?





Attachment#1 (jpg file)

David

"Extraordinary claims require extraordinary proof " - Carl Sagan

This is a hot, active topic! D600 SD memory card speeds [View all] , mirek21 , Sun 14-Apr-13 09:12 PM
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