The transfer rate, when the USB is operating in low-speed of operation is _____
Explanation: The USB has two rates of operation the low-speed and the full-speed one.
THe high speed mode of operation of the USB was introduced by _____
Explanation: The high-speed mode of operation was introduced with USB 2.0,which enabled the USB to operatte at 480 Mb/s.
The sampling process in speaker output is a ________ process.
Explanation: The isochronous process means each bit of data is seperated by a time interval.
The USB device follows _______ structure.
Explanation: The USB has a tree structure with the root hub at the centre.
The I/O devices form the _____ of the tree structure.
Explanation: The I/o devices form the leaves of the structure.
USB is a parallel mode of transmission of data and this enables for the fast speeds of data transfers.
Explanation: The USB does a serial mode of data transfer.
In USB the devices can communicate with each other.
Explanation: It allows only the host to communicate with the devices and not between themselves.
The device can send a message to the host by taking part in _____ for the communication path.
When the USB is connected to a system, its root hub is connected to the ________
Explanation: The USB’s root is connected to the processor directly using the BUS.
The devices connected to USB is assigned an ____ adrress.
Explanation: To make it easier for recognition the devices are given 7 bit addresses.
The USB address space can be shared by the user’s memory space.
Explanation: The USB memory space is not under any address sapces and cannot be accessed.
The initial address of a device just connected to the HUB is ____ .
Explanation: By standard the usual address of a new device is zero.
Locations in the device to or from which data transfers can take place is called ____
A USB pipe is a ______ channel.
Explanation: This means that the pipe is bi-directional in sending messages or information.
The type/s of packets sent by the USB is/are _______
Explanation: This means that the usb gets both data and control signlas required for the transfer operation.
The first feild of any packet is _____
Explanation: The PID is the field that is used to identify the device (the device id).
The 4 bit PID’s are transmitted twice.
Explanation: The fields are transmitted twice, once with the true values and the second time with the complemented values.
The last field in the packet is ______
Explanation: The last 5 bits of the packet is used for error checking, that is cyclic redundancy check.
The CRC bits are computed based on the values of the _____
Explanation: The CRC bits are calculated based on the values of the address and endp.
The data packets can contain data upto ______
The most important objective of the USB is to provide ______
Explanation: The above are all the common features of the USB.
The transmission over the USB is divided into ____
Explanation: To support the isochronous mode of operation the usb transmission is divided into frames.
The _____ signal is used to indiacate the beginning of a new frame.
Explanation: The SOF(State Of Frame) is used to inidicate the beginning of a new frame.
The SOF is transmitted every ______
The power specification of usb is _____