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DSI Description

Distributed System Interface [DSI] was developed by Motorola [Freescale] as a dedicated safety bus. The DSI is a niche area network (NAN) designed to interconnect multiple remote sensor and actuator devices to a central control module. DSI is a two-wire serial bus linking safety-related sensors and components in vehicles, air-bags for example. The DSI bus uses a 3-level voltage scheme in a Master/Slave access approach. Data speed is up to 4Kbps [minimum], and a 4 bit CRC.
The lines are DSI Bus Input [BUSin], DSI Bus Output [BUSout], and Bus Return [BUSRTN].

DSI messages are composed of individual words separated by a frame delay. Transfers are full duplex at a minimum data rate of 5bps [no maximum is set]. Command messages from the master occur at the same time as responses from the slaves. Slave responses to commands occur during the next command message.
The maximum number of nodes allowed is 16, 1 Master with 15 Slaves.

byteflight Interface description

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