Cirrus Logic CS4953xx - Manual (Page 30)

Softboot
CS4953xx Hardware User’s Manual
DS732UM10 Copyright 2010 Cirrus Logic, Inc 2-16
2.5.2.2 Softboot Example
Figure 2-6 contains an example softboot flow diagram. Section 2.5.2.3. provides a step-by-step description
of the Softboot procedure using the Host Control Master Boot (HCMB) procedure that is most commonly
used CS4593x systems.
Figure 2-6. Soft Boot Example Flowchart
MSG
==BOOT_START
WRITE_* (HCMB_<MODE>)
READ_* (MSG)
N
Y
MSG==
BOOT_SUCCESS
N
Y
READ_* (MSG)
MSG ==APP_START
WRITE_* (SOFT_RESET)
READ_* (MSG)
N
Y
MORE .ULD FILES?
Y
N
DONE
SEND HARDWARE
CONFIGURATIONS
SEND FIRMWARE
CONFIGURATIONS
WRITE_* (KICKSTART)
* is replaced with SPI,
I2C, etc. depending on
the communication
protocol used.
EXIT(ERROR)
EXIT(ERROR)
EXIT(ERROR)
MSG == SOFTBOOT_ACK?
WRITE_* (SOFTBOOT)
READ_* (MSG) EXIT(ERROR)
N
Y
START
IRQ == LOW?
N
Y Y
N
TIMEOUT?