Antar muka komputer l2: Prinsip dasar digital interface
Antar muka komputer l3: UNIVERSAL SERIAL BUSD3 Metrologi dan
InstrumentasiInstitut Teknologi Bandung dan Kementrian Perdagangan
RI
Dr. Augie [email protected] September
1998, Microsoft, Intel, Compaq, and NEC developed revision 1.1 of
the universal serial bus. The objective was to standardize the
input/output connections on the IBM PC for devices like printers,
mice, keyboards, and speakers. The USB is well suited for DAQ
systems in the laboratory or other small-scale systems.Maximum
cable distance, low speed: 3 meters, high speed: 5 meters
Connecting the Usb
USB Topology
Host Hub Block Diagram
Control of host hubInitialization and configuration Enabling and
disabling the ports Recognizing the speed of devices Recognizing
that a device has been connected Getting information from the
application software Creating a packet and then frame Sending the
information on to the bus Waiting and recognizing a response Error
correction Recognizing that a device has been disconnected Using
the port as a repeaterConnectors
Host hub Controller DiagraM
Communication flow
Connector Pin
Low-Speed and High-Speed Cables
Usb Wiring Diagram
Differential Balanced signalingMaximum voltage transmitted +3.6
V dc Minimum voltage transmitted +2.8 V dc Minimum voltage needed
to sense a transition +/ 0.2 V dc Typical line voltage as seen from
the receiver +/ 3 V dcEncoding Scheme
PACKET FORMAT
