Multiplex communications – Wide area network – Packet switching
Patent
1995-06-07
1998-10-20
An, Meng-Ai T.
Multiplex communications
Wide area network
Packet switching
395681, 395286, 395304, 395873, 395881, 395556, 370278, G06F 1340, G06F 104
Patent
active
058260684
ABSTRACT:
A host adapter integrated circuit that contains data transfer modules has a serial port that uses a single serial port pin to communicate with a slave serial port input-output integrated circuit that interfaces to various resources that are included in a support circuit. The serial port forms a packet from each byte of information to be transferred from a module to the slave device by adding a start bit before the byte, followed by a parity bit at the end of the byte and followed by a stop bit. After transmitting the packet, the serial port waits for an acknowledge packet from the slave serial port input-output integrated circuit, for example for two clock cycles after transmission of the packet. For synchronous operation, a common oscillator drives the clock signal on the slave serial port input-output integrated circuit and host adapter integrated circuit. The serial port pin in the host adapter integrated circuit is connected to a shifter circuit in the serial port that serially clocks data from the serial port pin and passes the data parallelly to a bus in the host adapter integrated circuit and vice versa.
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Adaptec, Inc.
An Meng-Ai T.
Follansbee John
Suryadevara Omkar K.
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