Host and device serial communication protocols and communication packet formats
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United States of America Patent
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Aug 19, 2003
Issued Date -
N/A
app pub date -
Mar 15, 2000
filing date -
Mar 17, 1999
priority date (Note) -
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status (Latency Note)
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Abstract
A method for communicating data and control from a host computer to a device is provided. The method includes generating a packet at the host computer and transmitting the packet to the device. The device responding to the packet with a handshake, and the handshake includes one of an ACK, a NACK, and an ALERT. The ACK is indicative that the packet was received without errors and a next packet in a sequence of packets can be sent to the device, the NACK is indicative that the packet was received without errors but a re-transmission should be attempted, and the ALERT is indicative of an error condition at the device and a re-transmission should not be attempted. In this example, the packet has a packet format including: (a) a synchronization field; (b) a packet type (PT) field following the synchronization field; (c) a byte count (BC) field for defining a length of data for the packet; (d) a data type (DT) field for defining whether the data is one of link control, device control, and device data; and (e) a data field.
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