pub const CMD11: Command;Expand description
CMD11: VOLTAGE_SWITCH — switch the bus to 1.8 V signaling.
SD 3.0 / UHS-I cards and eMMC HS200 share this command. The card responds with R1; the actual voltage transition is then driven by the host controller (gate SD clock → switch IO domain → wait t_VSW → re-enable clock). Implementations live in the host layer.