STA680 datasheet(27/48 Pages) STMICROELECTRONICS

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STA680 Scheda tecnica(PDF) 27 Page - STMicroelectronics

Il numero della parte	STA680

Spiegazioni elettronici	Automotive HD Radio™ baseband receiver

PDF	48 Pages

Scroll/Zoom	100%

Produttore elettronici	STMICROELECTRONICS [STMicroelectronics]

Homepage	http://www.st.com

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27 / 48 page

DS5877 Rev 13

27/48

STA680

Power supply ramp-up phase

Once the source of the secondary boot code has been identified, the STA680 executes the

following steps:

code authentication

SDRAM initialization

secondary boot code download to SDRAM.

In order to decrease the boot time during the secondary phase, the STA680 performs the

setup of the PLLs and sets the internal clock frequency to 28.224 MHz (see Figure 7).

Subsequently it downloads and validates the application code either from the external Flash

memory or from the host microcontroller. This ends the boot procedure.

4.3

Normal operation mode

After the execution of the boot code, the device enters the normal operation mode by

jumping to the main program loop.

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