USB embedded host computer control device designs

The serial interface engine " Each engine includes two USB Driver and may control four USB apparatuses without making use of the other hardware EZ-Host EZ-Host device have the intersection of firmware and structure can manage most the intersection of USB and detailed requirement of host computer structural another characteristic this to guide the intersection of network along with the intersection of line concentrator and keyboard / line concentrator association Part appear often a really question with keyboard or keeping the keyboard of the line concentrator line concentrator answer whether with keyboard line concentrator requires, understand, consist line concentrator And then keyboard need lasting line concentratoring chassis code last support to line concentrator after supporting fortunately As follows chapter it if you fail to last chassis and a few chassis, last example and the way their but not employ by code interface.
Chassis summary EZ-Host chassis include all realize the intersection of USB Flash Drive along with the intersection of host computer and firmware function need range from the task sequence apparatus enumerate bandwidth distributing and power management among them In contrast the service program could be that the firmware controls the specialized USB apparatus and transmits their data to final application The core in the chassis could be the operation of TD processor TD processor as a consequence of being called " The work description device " (TD) Data organization use their information and USBs hardware especially " The serial interface engine " (SIE) That want paying attention to communication is the fact that each SIE control two ports with each SIE to get a TD processor EZ-Host chassis used many kinds of data organizations to achieve that can come thereto to use the structure including TD and USB and " ask for the module " (URB) Task description device to transmit to data organization of hardware include particular hardware imterface such as intersection of knowledge field and port of SIE number terminal count, receive and dispatch the intersection of information as well as the intersection of buffer length and data packet ID code and URB structural indicating device.
This logical information includes installing package of software and USB Flash Disk structure indicating device with USB apparatus dashpot URB's including TD required logical information URB provides the data organization assigned and packed into in transaction after which URB describes TD processor TD processor and adds URB into TD tabulation freely while carrying on USB transaction TD processor cope with the intersection of TD and tabulation arrange, transmit sequence and TD that could set for convey to EZ-Host hardware process leisurely Fig.