RM0319 datasheet(37/368 Pages) STMICROELECTRONICS

37 / 368 page

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

RM0319 数据表(PDF) 37 Page - STMicroelectronics

RM0319 数据表(HTML) 37 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

数据表下载