IEEE 1394 USB and AGP High Speed Transfer

IEEE 1394, USB, and AGP High Speed Transfer

AGP • Accelerated Graphics Port – Intended to create a faster means of retrieving data from the computer to the graphics card – Simply enhanced from the PCI architecture – Designed by Intel Corporation

AGP – Purpose Of Design • As technology progresses and overall demand increases, the demand from the user for fast and smooth flowing graphics also increases • Software demands are continuously growing • 3 D Rendering has a high demand for memory bandwidth

AGP vs. PCI • Enhanced from PCI architecture running at 66 MHz • Four Enhancements Made: – Deeply Pipelined memory read and write operations, fully hiding memory access latency – Demultiplexing of address and data on bus to allow almost 100% bus efficiency – New AC timing in the 3. 3 v electrical specification that provides for one or two data transfers per 66 -MHz clock cycle, allowing for data throughput in excess of 500 MB/s – A new low voltage electrical specification that allows four data transfers per 66 MHz clock cycle, providing real data throughput of up to 1 GB/s Intel Corporation (AGP Interface Specification)

AGP vs. PCI • Architecture of AGP is identical to PCI except for the four enhancements of AGP • AGP’s work on an independent bus than that of the PCI ports • The physical make-up of PCI cards and AGP cards are not interchangeable

IEEE 1394 • Created by Apple in 1986 – Fire. Wire • IEEE standard 1394 created 1995 • High speed data transfer – Up to 400 mb/s – Working on 1 gb/s • Much faster than IDE and SCSI

IEEE 1394 – Cable Design • 6 wires – Two power – Two twisted pairs

IEEE 1394 – Limitations • 1394 Cable can not exceed 4. 5 meters – Can be increased • 63 1394 devices can be connected in a chain • Non-cyclical

IEEE 1394 – Application • • Video Audio Hard Drives DVD

USB • Universal Serial Bus – Designed by Intel Corporation – Originally Designed for: • Connection of PC to Telephone • Ease-Of-Use • Port Expansion

USB 2 • USB 2 was born as a modification of the original USB architecture • Designed to deal with the increasing technology demand increasing need to deal with large amounts of data • Digital Media is a perfect example of increasing needs to deal with large amounts of data due to high resolution pictures and movies which create high density files

USB 1 vs. USB 2 • USB 1 – Minimum transfer rate of 1. 5 MB/s – Maximum transfer rate of 12 MB/s • USB 2 – Maximum transfer rate of 480 MB/s • USB 2 has a maximum transfer rate 40 x faster than USB 1!

USB - Connectors • Connector A is commonly located upstream from the host – It usually connects to the PC • Connector B is commonly located downstream from the USB device – It usually connects to the peripheral

USB – So Much More • There is a much more complex system behind USB than what has been shown here • USB often supplies its peripherals with its own power supply, indicating a sophisticated electrical system • Most of the concepts are out of our comprehension at this point • These concepts can be found in the USB Specification found at WWW. INTEL. COM