User`s manual

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Slave Boot Procedures

CS485xxr Hardware User’s Manual

DS734UM7 Copyright 2009 Cirrus Logic, Inc. 2-4

Figure 2-2. Slave Boot Sequence

MSG

==BOOT_START

RESET (HIGH)

WAIT 50 μS

WRITE_* (SLAVE_BOOT)

READ_* (MSG)

EXIT(ERROR)

N

Y

MSG==

BOOT_SUCCESS

EXIT (ERROR)

N

Y

READ_* (MSG)

MSG ==APP_START

WRITE_* (SOFT_RESET)

READ_* (MSG)

EXIT (ERROR)

N

Y

MORE .ULD FILES?

Y

N

DONE

SEND HARDWARE

CONFIGURATIONS

SEND FIRMWARE

CONFIGURATIONS

WRITE_* (KICKSTART)

START

RESET (LOW)

SET HS[3:0] PINS FOR

OPERATIONAL MODE

* is replaced with SPI

,

I2C, etc. depending o

n

the communication

protocol used.

SEND .ULD FILE