嵌入式linux开发 (十五) FLASH(5) I.MX6ULL外扩SD卡

- 正点原子ARMLinux开发板 I.MX6ULL	cortex-A7
	-外扩
		micro sd卡:16GB,无型号

• soc

The i.MX 6ULL application processors are NXP's latest additions to a growing family of real-time processing products offering high-performance processing optimized for lowest power consumption.
The i.MX 6ULL processors feature NXP's advanced implementation of the ARM ® Cortex ® -A7 core.
The processors can be interfaced with DDR3, DDR3L LPDDR2 (single channel) DRAM memory devices.

The ROM supports booting from the MMC/eMMC and SD/eSD compliant devices.

SOC端 SD卡控制器(Ultra Secured Digital Host Controller)

• 总介
• 寄存器及映射
• 引脚

USDHC1_DATA0-USDHC1_DATA3
USDHC1_CMD
USDHC1_CLK
USDHC1_CD_B

• 时序

设备端 MicroSD卡

• 引脚

DAT0-DAT3
CMD
CLK
CD

总结

• SD卡和EMMC相同点

控制器一样

• SD卡和EMMC不同点

EMMC: 接了控制器的2口	8线		没有插入检测接口
SD  : 接了控制器的1口 	4线		有插入检测接口(CD)