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USB host controller

A universal serial bus, host controller technology, used in data exchange, instrumentation, electrical digital data processing, etc. through path configuration

Inactive Publication Date: 2005-07-13
ADVANCED MICRO DEVICES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It's worth noting that other motherboard layouts exist that don't have a Northbridge, or that have a Northbridge but no AGP or PCI

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Embodiment Construction

[0080] Preferred embodiments of the present invention will be described below with reference to the accompanying drawings, in which like components and structures are designated with like reference numerals.

[0081] Referring now to the accompanying drawings in particular Figure 4 , Figure 4 The main components of a USB 2.0 compliant host controller 400 according to an embodiment are shown. In general, a host controller consists of three main components: an enhanced host controller 225 , one or more companion host controllers 215 , and a port router 415 .

[0082] Enhanced host controller 225 handles USB 2.0 high-speed data traffic. In addition, port router 415 is also controlled.

[0083]In the companion host controller unit 215 of the embodiment of the present invention, there are two OHCI-compatible host controllers, namely OHC0 405 and OHC1 410 . These controllers handle all USB 1.1-compliant data traffic and can include legacy keyboard emulation for non-USB-aware env...

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Abstract

A USB host controller is provided for handling the data traffic between at least one USB device and a system memory of a computer system. The USB host controller comprises a data fetch unit (530) for fetching data elements from the system memory, a storage unit (535) for storing the fetched data elements, and a transaction processing unit (570) for processing transactions sent to or received from the USB device dependent on the fetched data elements stored in the storage unit. The data fetch unit and the transaction processing unit are arranged for operating asynchronously. The host controller may be USB 2.0 compliant and may be realized in a southbridge.

Description

technical field [0001] The present invention mainly relates to a universal serial bus (Universal Serial Bus, referred to as USB) host controller, and in particular to processing data traffic between each USB device and a system memory of a computer system. Background technique [0002] The Universal Serial Bus was first developed in 1995 to define an external expansion bus that facilitated the connection of additional peripherals to a computer system. USB technology is implemented by PC host controller hardware and software and by a peripheral-friendly master-slave protocol, resulting in robust connections and cable assemblies. Each USB system can be expanded by a multi-port hub. [0003] In USB systems, the role of the system software is to provide all application software with a consistent view of the I / O architecture by hiding the hardware implementation details. Specifically, system software manages the dynamic attachment and detachment of peripheral devices and commun...

Claims

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Application Information

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IPC IPC(8): G06F13/12G06F13/38H04L12/28
Inventor S·K·海塞D·E·古利克
Owner ADVANCED MICRO DEVICES INC
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