Patent ID: 8307143

Claim:
An interface card system configured to intervene between a host system and a first and a second Secure Digital card device, the interface card system comprising: a CPU bus interface and a front Secure Digital bus interface on host side, both serving as an interfaces for the host system; a host interface module connected to both the CPU bus interface and the front Secure Digital bus interface on host side, wherein the host interface module interprets a Secure Digital command and controls operation of the whole of the interface card system; a first and a second internal Secure Digital host engines each connected to the host interface module, wherein the first and second internal Secure Digital host engines are operative as a host controller for the first and second Secure Digital card devices respectively, wherein each of the first and second internal Secure Digital host engines includes a direct transfer interface via which the first and second internal Secure Digital host engines are connected to a UDMA handler, and wherein a transfer mode and a data transfer path of each of the first and second internal Secure Digital host engines are selected by a direct transfer interface control signal issued through the UDMA handler; a first and a second selectors connected to the first and second internal Secure Digital host engines, respectively, wherein each selector selects a path for data or a command; a first and a second Secure Digital bus interface on device side connected to the first and second selectors, respectively, wherein the first and second Secure Digital bus interfaces on device side serve as interfaces with the first and second Secure Digital card devices, respectively; and a data pass-through control section connected to the front Secure Digital bus interfaces on host side and the first and second selectors, wherein the data pass-through control section allows Secure Digital commands and data to pass through as needed.