Datasheet

06 February 2012 Broadcom Europe Ltd. 406 Science Park Milton Road Cambridge CB4 0WW Page 150
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10.3 LoSSI mode
Figure 10-5 LoSSI mode Typical usage
The LoSSI standard allows us to issue commands to peripherals and to transfer data to and from
them. LoSSI commands and parameters are 8 bits long, but an extra bit is used to indicate whether
the byte is a command or data. This extra bit is set high for a parameter and low for a command. The
resulting 9-bit value is serialized to the output. When reading from a LoSSI peripheral the standard
allows us to read bytes of data, as well as 24 and 32 bit words.
Commands and parameters are issued to a LoSSI peripheral by writing the 9-bit value of the
command or data into the SPI_FIFO register as you would for SPI mode. Reads are automated in that
if the serial interface peripheral detects a read command being issued, it will issue the command and
complete the read transaction, putting the received data into the FIFO.
10.3.1 Command write
10.3.2 Parameter write