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LPC2388 and SD Card Problem

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madjid

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Hi
I have designed a board using LPC2388 and a SD card class 10.
I use RL-ARM library for interfacing SD card in Native 4-bit mode.
Every thing is Ok, but a problem exist. The write speed on SD card is very low (about 1MBPS).
I expect at least 3-4 MBPS, when I inspected more deeply I understood that when microcontroller send a command to SD card,
in most of the times a command time-out occurs. I don't know why this occurs. Can any body help me?
 

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