Cirrus Logic CS485xx - Manual (Page 52)

SPI Port
CS485xx Hardware User’s Manual
DS734UM7 Copyright 2009 Cirrus Logic, Inc. 3-20
5. If SCP_IRQ is still low after 4 bytes, then proceed to step 4 and read another 4 bytes out of the
CS485xx slave.
6. If SCP_IRQ is high, the SCP_CS line of CS485xx should be driven high to end the read transaction.