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This is the strict procedure from the January 2010 release notes:
SD 3.0 hosts typically handle removable cards, while eMMC 4.4 is soldered storage. This guide details a controller that manages both via an AHB bridge.
The sd3.0-host-ahb-emmc4.4-usersguide-ver5.9-jan11-10.pdf describes a robust, albeit aging, bridge between an ARM AHB fabric and two critical storage interfaces. While modern systems use eMMC 5.1 and SD 6.0 (PCIe/NVMe), understanding this specific combination is essential for maintaining automotive/industrial devices built between 2010 and 2014.
| Feature | SD 3.0 Host Mode | eMMC 4.4 Mode | | :--- | :--- | :--- | | | Class 0, 2, 4, 6 (ACMD41) | Class 0, 1, 2, 3, 4, 5, 6 (CMD1) | | Initialization | ACMD41 with OCR | CMD1 with OCR | | Voltage | 2.7V – 3.6V | 2.7V – 3.6V or 1.8V (Dual) | | Data Transfer | High Speed (50 MHz) / SDR104 (208 MHz) | Legacy (26 MHz) / High Speed (52 MHz) / DDR (50 MHz) | | Bus Width | 1-bit or 4-bit | 1-bit, 4-bit, or 8-bit |
// Set AHB clock to 66 MHz, divide by 2 for host core (33 MHz) write_register(SDCTL, (1 << 8) | 0x01); // Soft reset | Clock div 2 delay_ms(10);