about SD clk | Cypress Semiconductor
about SD clk
I test a simple Read/Write action using FX3S FPGA Dev Board.
I use a two SD cards. one is Class 10 another is UHS-1.
I test Read test a big file (about 1GB) , these cards are almost same performace.
In the Desktop PC. these cards performace difference is about 150%
(Class 10 card : 20 MB/s, UHS-1 : 33 MB/s)
I have some question.
Can I improve a performace on UHS-1 card ?
I set a 104MHz on SD CLK, but The CLK works 48MHz.
I change a CLK to 20Mhz, 26Mhz, 52Mhz, 104Mhz.
the CLK working 18Mhz, 24Mhz, 48Mhz, 48Mhz
Why 52MHz and 104Mhz are same CLK?
and can I improve a CLK over 48Mhz ?