Figure 2-2. Slave Boot Sequence - Cirrus Logic CS485 Series User Manual

DS734UM7
START
RESET (LOW)
SET HS[3:0] PINS FOR
OPERATIONAL MODE
RESET (HIGH)
WAIT 50 μS
WRITE_* (SLAVE_BOOT)
READ_* (MSG)
N
MSG
==BOOT_START
Y
SEND .ULD FILE
READ_* (MSG)
N
MSG==
BOOT_SUCCESS
Y
Y
MORE .ULD FILES?
N
WRITE_* (SOFT_RESET)
READ_* (MSG)
N
MSG ==APP_START
Y
SEND HARDWARE
CONFIGURATIONS
* is replaced with SPI,
SEND FIRMWARE
I2C, etc. depending on
CONFIGURATIONS
the communication
WRITE_* (KICKSTART)
DONE

Figure 2-2. Slave Boot Sequence

Copyright 2009 Cirrus Logic, Inc.
CS485xxr Hardware User's Manual
EXIT(ERROR)
EXIT (ERROR)
EXIT (ERROR)
protocol used.
Slave Boot Procedures
2-4