SEC2410 datasheet(41/283 Pages) MICROCHIP

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 2013 - 2014 Microchip Technology Inc.

DS00001587C-page 41

SEC2410/SEC4410

7.0

MEMORY MAP

7.1

Bus Map Overview

The ARM has three external AHB-Lite buses. The ICode bus is used for instruction fetches in the range of 0x00000000

to 0x1FFFFFFF. The DCode bus is used for data and debug access in the same range from 0x00000000 to

0x1FFFFFFF. The System bus allows instruction fetch, data, and debug access to the ranges 0x20000000-

0xDFFFFFFF and 0xE0100000-0xFFFFFFFF.

The System bus coming out of the ARM is divided into 5 regions. The first is the CR_X32 bus which is a 32 bit version

of the Xdata bus. This is done through a bridge which occupies a 64Kbyte address space 0x40000000~0x40000FFFF.

All the card reader control registers reside in this space. The second region is CR_AHB which is the AHB bus in the

card readers. This is done through another bridge which occupies a 16Mbyte address space (between

0x20000000~0x20FFFFFF. The third region is the EC_SPB which is also a 64Kbyte address space from 0x40020000-

0x4002FFFF. The forth is the SPI region 0x60000000 to 0x60FFFFFF. Any access in this region results in access from

the external SPI rom if present. The remaining region is used to decode for devices such as SmartCard, clock control,

Data SRAM etc.

FIGURE 7-1:

BUS ADDRESSES

AHB

SPB

AHBS

AHB

SPI

Interface

AHB

CR_X32

Trace Fifo

0x60000000-

0x6100BFFF

0x40000000 ~ 0x4000FFFF

0x42000000 ~ 0x421FFFFF

0x40020000 ~ 0x4002FFFF

0x42400000 ~ 0x425FFFFF

0x20000000 ~ 0x200FFFFF

0x22000000 ~ 0x23FFFFFF

CR_AHB

EC_SPB

CR_X32

ROM

32KB

CODE

RAM

96KB

ARM Cortex-M3

System AHB

AHBC

AHBS

External

Interrupts

JTAG

nReset

Clocks

DNOTITRANS

0x00060000-

0x00067FFF

0x00000000-

0x00007FFF

0x00020000-

0x00037FFF

0x20000000-

0xDFFFFFFF

(System AHB bus)

DATA

RAM

32KB

AHB Slave

(NC)

Arbiter

OTP

TEST

0x62000800-

0x62000BFF

CLOCK

Control

0x62000400-

0x620007FF

Smart

Card

0x62000000-

0x620003FF

External Access

0x60000000-

0x60FFFFFF

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