原标题：Atmel SAM9G45 32位MCU开发方案

　　Atmel公司的SAM9G45是基于ARM926EJ-S的32位MCU，集成了LCD控制器，电阻型触摸屏，照相机接口，音频，以太网10/100和高速USB与SDIO。处理器工作频率400MHz和具有多个100+Mbps数据速率外设，主要用在工业和建筑物控制，HVAC，POS终端，打印机和医疗设备，带数据集中器的智能电网，人机接口(HMI)和机-机接口(M2M)。本文介绍了 SAM9G45主要特性，方框图，系统控制器框图和评估板SAM9G45-EKES主要特性，架构图，电路图和元件布局图。

　　The ARM926EJ-S based SAM9G45 features the frequently demanded combination of user interface functionality and high data rate connectivity, including LCD Controller, resistive touchscreen, camera interface, audio, Ethernet 10/100 and high speed USB and SDIO. With the processor running at 400MHz and multiple 100+ Mbps data rate peripherals, the SAM9G45 has the performance and bandwidth to the network or local storage media to provide an adequate user experience.

　　The SAM9G45 supports DDR2 and NAND Flash memory interfaces for program and data storage.

　　An internal 133 MHz multi-layer bus architecture associated with 37 DMA channels, a dual external bus interface and distributed memory including a 64-KByte SRAM which can be configured as a tightly coupled memory (TCM) sustains the high bandwidth required by the processor and the high speed peripherals.

　　The I/Os support 1.8V or 3.3V operation, which are independently configurable for the memory interface and peripheral I/Os. This feature completely eliminates the need for any external level shifters. In addition it supports 0.8 ball pitch package for low cost PCB manufacturing.

　　The SAM9G45 power management controller features efficient clock gating and a battery backup section minimizing power consumption in active and standby modes.

　　SAM9G45主要特性：

　　• 400 MHz ARM926EJ-S™ ARM® Thumb® Processor

　　– 32 KBytes Data Cache, 32 KBytes Instruction Cache, MMU

　　• Memories

　　– DDR2 Controller 4-bank DDR2/LPDDR, SDRAM/LPSDR

　　– External Bus Interface supporting 4-bank DDR2/LPDDR, SDRAM/LPSDR, Static Memories, CompactFlash, SLC NAND Flash with ECC

　　– One 64-KByte internal SRAM, single-cycle access at system speed or processor speed through TCM interface

　　– One 64-KByte internal ROM, embedding bootstrap routine

　　• Peripherals

　　– LCD Controller supporting STN and TFT displays up to 1280*860

　　– ITU-R BT. 601/656 Image Sensor Interface

　　– USB Device High Speed, USB Host High Speed and USB Host Full Speed with On-Chip Transceiver

　　– 10/100 Mbps Ethernet MAC Controller

　　– Two High Speed Memory Card Hosts (SDIO, SDCard, MMC)

　　– AC’97 controller

　　– Two Master/Slave Serial Peripheral Interfaces

　　– Two Three-channel 16-bit Timer/Counters

　　– Two Synchronous Serial Controllers (I2S mode)

　　– Four-channel 16-bit PWM Controller

　　– Two Two-wire Interfaces

　　– Four USARTs with ISO7816, IrDA, Manchester and SPI modes

　　– 8-channel 10-bit ADC with 4-wire Touch Screen support

　　• System

　　– 133 MHz twelve 32-bit layer AHB Bus Matrix

　　– 37 DMA Channels

　　– Boot from NAND Flash, SDCard, DataFlash® or serial DataFlash

　　– Reset Controller with on-chip Power-on Reset

　　– Selectable 32768 Hz Low-power and 12 MHz Crystal Oscillators

　　– Internal Low-power 32 kHz RC Oscillator

　　– One PLL for the system and one 480 MHz PLL optimized for USB High Speed

　　– Two Programmable External Clock Signals

　　– Advanced Interrupt Controller and Debug Unit

　　– Periodic Interval Timer, Watchdog Timer, Real Time Timer and Real Time Clock

　　• I/O

　　Five 32-bit Parallel Input/Output Controllers

　　160 Programmable I/O Lines Multiplexed with up to Two Peripheral I/Os with Schmitt trigger input

　　• Package

　　– 324-ball TFBGA, pitch 0.8 mm

　　图1。SAM9G45方框图

　　图2。SAM9G45系统控制器框图

　　图3。SAM9G45电源管理控制器框图

　　评估板SAM9G45-EKES

　　The Atmel® SAM9G45-EKES is a fully-featured evaluation platform for the Atmel SAM9G45-based microcontroller. The evaluation kit allows users to extensively evaluate, prototype and create application specific designs.

　　The SAM9G45-EKES includes many hardware peripherals such as:

　　 Two high speed USB hosts and one high speed device port

　　 An Ethernet 10/100 interface

　　 Two high speed multimedia card interfaces

　　 An LCD TFT display (480*RGB*272)

　　 A composite video output

　　 A camera interface

　　 Several communication peripherals such as:

　　– Universal Synchronous/Asynchronous Receiver Transmitter (USART)

　　– Serial Synchronous Controller (SSC)

　　– Two-Wire Interface (TWI)

　　The external memory block is made of 3 memory types:

　　 DDR2-SDRAM

　　 NAND Flash

　　 NOR Flash

　　图4。评估板AT91SAM9G45-EKES外形图

　　图5。评估板AT91SAM9G45-EKES架构图