Patent ID: 7162562
Filing Date: 2007-01-09
Classification: G06F

Abstract:
1. A reading method of a portable electronic device, the portable electronic device including a main electronic apparatus and an expansion pack, wherein the main electronic apparatus includes an MFHS bus, a CPU, and a host controller which is connected to the CPU by a first system bus; the expansion pack includes a client controller; and the MFHS bus includes a clock signal line, a status line, a ready signal line, and a plurality of content signal line, the reading method comprising: detachably connecting the expansion pack to the main electronic apparatus and connecting an expansion device to the expansion pack so that the main electronic apparatus communicates with the expansion device through the expansion pack, wherein the client controller of the expansion pack communicates with the host controller of the main electronic apparatus through the MFHS bus and communicates with the expansion device by a second system bus; outputting a first command address cycle from the CPU to the first system bus; receiving the first command address cycle which is outputted from the first system bus in M clock cycles by the host controller; transforming the first command address cycle into a second command address cycle by the host controller and transferring the second command address cycle through the MFHS bus in N clock cycle, thereby enabling the status signal line of the MFHS bus, where N>M; receiving the second command address cycle by the client controller when the status signal line is enabled; transforming the second command address cycle into a third command address cycle by the client controller; and transferring the third command address cycle to the expansion device by the second system bus.