RM0319 datasheet(37/368 Pages) STMICROELECTRONICS

No. de pieza	RM0319

Descripción Electrónicos	SPEAr320S architecture and functionality

PDF	368 Pages

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Fabricante Electrónico	STMICROELECTRONICS [STMicroelectronics]

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RM0319

BootROM

Doc ID 022640 Rev 3

37/368

5.4

Hardware overview

Figure 6.

Hardware memory

5.4.1

eROM (Embedded ROM)

eROM is the 32KB of area starting from 0xFFFF_0000. The ARM processor is mapped to

HIGH vectors and starts executing instructions from 0xFFFF_0000.

5.4.2

Shadow memory

Shadow memory is the area where BootROM copies the X-Loader after reading/receiving

from any of the booting processes. Address where X-Loader is copied in the shadow

memory is specified in the X-Loader header.

5.4.3

System controller

The system controller is used to program/control the system clock mode and frequency.

After reset, the system is set to DOZE mode.

BootROM configures the system in different modes depending on different booting types:

●

For serial NOR, parallel NOR, 8/16-bit NAND, UART0 and BootROM bypass booting:

SLOW mode (CPU 24 MHz - AHB 24 MHz)

●

For Ethernet and USB booting: NORMAL mode (CPU 333 MHz - AHB 166 MHz)

ARM

Shadow

Memory

eSRAM

FF00.0000h

eROM

High Vectors

SDRAM

(DDR2)

NAND/

NOR

FLASHES

Power On Reset

D2800000h

SPEAr320S

Boot ROM

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