Friday, December 07, 2007

Peripheral Component Interconnect

The Peripheral Component Interconnect, or PCI Standard (in practice almost always shortened to PCI), specifies a computer bus for attaching peripheral devices to a computer motherboard.The PCI Bus is a high performance bus for interconnecting chips, expansion boards, and processor/memory subsystems.

Wednesday, December 05, 2007

Non-Return-to-Zero Inverted

NRZI encoding is used for data transmission in the standard USB.

EIA standards :RS232/422/485

RS 232,422,485 -quick reference

RS 232 tutorial - A very informative webpage - Recommended

Selecting and Using RS-232, RS-422, and RS-485 Serial Data Standards
An application note from Maxim semiconductors.Includes connection firures for RS232.422,485 and specifications

Dallas Semiconductor application note on RS232
- simple

RS422/485 application note

Comparing Bus Solutions

Texas Instruments Application Report "Comparing Bus Solutions" February 2004, Texas Instruments,

Sunday, December 02, 2007

USB On-The-Go

Every USB communications is between a host and a device. Devices can't communicate with each other directly. The On-The-Go supplement to the USB specification defines a new type of device that can function as both a device and as a scaled-back host (but not both at the same time). When functioning as a device, the On-The-Go device can communicate with a PC or other USB host. When functioning as a host, the device can connect to USB peripherals.

Universal Serial Bus