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Disclosed is a method for the insertion of debug port device traffic into a universal serial bus (USB) host-controller transaction schedule. Benefits include improved functionality.
English (United States)
This text was extracted from a Microsoft Word document.
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This is the abbreviated version, containing approximately
50% of the total text.
Method for the insertion of debug port device traffic into
a universal serial bus host-controller transaction schedule
Disclosed is a method for the insertion of debug port device
traffic into a universal serial bus (USB) host-controller transaction schedule.
Benefits include improved functionality.
A debug port device is a console used
by operating-system (OS) programmers to monitor and/or modify internal memory
by accessing data by way of a hardware interface on a personal computer (PC). Conventionally,
the interface is the RS-232 serial interface.
The conventional serial interface [DA1] is being replaced by a universal serial bus
(USB) implementation. In the future, a requirement may exist for the debug
console to communicate with the OS via USB hardware.
A USB host controller comprised of
hardware and software is, ideally, constantly busy with packet-based traffic to
USB devices. USB devices can be categorized into two types, asynchronous and
periodic. A periodic device requires data to be delivered at a particular time
and at a particular rate. An asynchronous device requires data to be
A USB transaction consists of one or
more serial packets that are signaled on a USB wire.
A microframe is a concept only
applicable to the high-speed implementation of USB (USB 2.0). A microframe is a
period of time for which the beginning is marked by the transmission of a start
of frame (SOF) packet. SOF packets are sent at near-constant intervals so that
devices have a usable concept of timing. The amount of time that spans between
two SOF packets is typically 125 microseconds. If any devices are using the USB
physical media when it is time for the SOF packet to be transmitted, they are
disabled by the host controller.
Due to the time-sensitive nature of
periodic data, transaction...