MCIMX255AJM4A(2010) View Datasheet(PDF) - Freescale Semiconductor

Part Name

Description

Manufacturer

MCIMX255AJM4A
(Rev.:2010)

i.MX25 Applications Processor for Automotive Products

Freescale Semiconductor 

2 Features

Table 3 describes the digital and analog modules of the device.

Table 3. i.MX25 Digital and Analog Modules

Block

Mnemonic

1-WIRE

ARM9 or

ARM926

ATA

AUDMUX

CCM

CSPI(3)

DRYICE

EMI

Block Name Subsystem

Brief Description

1-Wire

Interface

ARM926

platform and

memory

Connectivity

peripherals

ARM®

ATA module Connectivity

peripherals

Digital audio Multimedia

mux

peripherals

Clock control Clocks

module

Configurable

serial

peripheral

interface

Connectivity

peripherals

DryIce module Security

External

memory

interface

Connectivity

peripherals

1-Wire support provided for interfacing with an on-board EEPROM, and

smart battery interfaces, for example: Dallas DS2502.

The ARM926 Platform consists of the ARM926EJ-S™ core, the ETM

real-time debug modules, a 5x5 Multi-Layer AHB crossbar switch, and a

“primary AHB” complex. It contains the 16-Kbyte L1 instruction cache,

16-Kbyte L1 data cache, 32-Kbyte ROM and 128-Kbyte RAM.

The ATA module is an AT attachment host interface. Its main use is to

interface with IDE hard disc drives and ATAPI optical disc drives. It interfaces

with the ATA device over a number of ATA signals.

The AUDMUX is a programmable interconnect for voice, audio, and

synchronous data routing between host serial interfaces (SSIs) and

peripheral serial interfaces (audio codecs). The AUDMUX has two sets of

interfaces: internal ports to on-chip peripherals, and external ports to off-chip

audio devices. Data is routed by configuring the appropriate internal and

external ports.

This block generates all clocks for the iMX25 system. The CCM also

manages the ARM926 Platform's low-power modes (wait, stop, and doze) by

disabling peripheral clocks appropriately for power conservation.

This module is a serial interface equipped with data FIFOs. Each

master/slave-configurable SPI module is capable of interfacing to both serial

port interface master and slave devices. The CSPI ready (SPI_RDY) and

Slave Select (SS) control signals enable fast data communication with fewer

software interrupts.

DryIce provides volatile key storage for Point-of-Sale (POS) terminals, and a

trusted time source for Digital Rights Management (DRM) schemes. Several

tamper-detect circuits are also provided to support key erasure and time

invalidation in the event of tampering. Alarms and/or interrupts can also

assert if tampering is detected. DryIce also includes a Real Time clock (RTC)

that can be used in secure and non-secure applications.

The External Memory Interface (EMI) module provides access to external

memory for the ARM and other masters. It is composed of four main

submodules:

• M3IF provides arbitration between multiple masters requesting access to

the external memory.

• Enhanced SDRAM/LPDDR memory controller (ESDCTL) interfaces to

DDR2 and SDR interfaces.

• NAND Flash controller (NFC) provides an interface to NAND Flash

memories.

• Wireless External Interface Memory controller (WEIM) interfaces to NOR

Flash and PSRAM.

i.MX25 Applications Processor for Automotive Products, Rev. 5

6

Freescale Semiconductor

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