ECS 154A Lecture Notes - Lecture 24: Usb, Serial Communication, Branch Table
2 Aug 2016
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Document Summary
Now almost all are serial: to convert from parallel to serial use a shift register, usb (universal serial bus) is a common standard for serial transmission with usb 3. 0 transferring at 5gb/s. I/o modules (south bridge and north bridge on a pc) on the motherboard provide the logic, buffers, error detection, and ports to communicate with the external devices on one side, and a system-type bus on the other. For external device interfaces, the modules have data, status, and control lines. For the system bus they have data, address, and control lines. The south bridge handles slower i/o devices and is connected to the north bridge rather than the system bus directly. Two modes of addressing are possible for i/o: memory mapped, used by current chips including arm, has the addresses for i/o within the main memory address space. Number of lines must be limited, and will be fewer than devices.
