Sd3.0-host-ahb-emmc4.4-usersguide-ver5.9-jan11-10.pdf [ULTIMATE ✯]

This appears to cover an AHB-based SD/MMC host controller (SD 3.0 spec) talking to eMMC 4.4 devices. Likely from an SoC vendor's IP block (maybe Synopsys or a proprietary ARM-based design).

Based on the AHB bus width (32-bit) and clock (100 MHz AHB typical): sd3.0-host-ahb-emmc4.4-usersguide-ver5.9-jan11-10.pdf