blockdiag sd_arch {
    default_fontsize = 16;
    node_width = 300;
    node_height = 100;
    span_width = 150;

	A [label = "SD Protocol Layer Driver Component:\nsdmmc"]
	B [label = "Host Driver Component:\nesp_driver_sdmmc"]
	C [label = "Host Driver Component:\nesp_driver_sdspi"]

	A -> B [dir = back, label = "Implements", style = dashed, hstyle = generalization, fontsize=14]
	A -> C [dir = back, label = "Implements", style = dashed, hstyle = generalization, fontsize=14]
}