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飞思卡尔 i.MX27 MCiMX27 ADS 原装开发板原理图 ，这是它的原理图，orCAD格式，大家可以下载下来看看，国内的开发板都是以它为基础开发的。我估计是中国大陆唯一开放的i.MX27开发板原理图。
The i.MX27 Application Development System (MCIMX27ADSE) is a development tool which is designed to run software applications designed for the i.MX27 processor.
Features
- i.MX27 Multimedia Application Processor
- Two clock-source crystals, 32 KHz and 26 MHz
- Power management & Audio IC (MC13783) included battery charging, 10bit ADC, buck switchers, boost switcher, regulators, amplifiers, CODEC, SSI audio bus, real time clock, SPI control bus, USB OTG transceiver & touchscreen interface
- Multi-ICE debug support
- Two 512Mbit DDR-SDRAM devices, configured as one 128MB, 32-bit device
- One 256Mbit Burst Flash with 128Mbit Pseudo Static RAM (PSRAM) memory device, configured as one 16MB flash with 8MB PSRAM, 16-bit device
- An single board system with connections for LCD display panel, Keypad and Image sensor.
- Complex Programmable Logic Device (CPLD) for reducing glue logic interface
- Software readable board revisions
- Configuration and user definable DIP switches
- Two SD/MMC, MS memory card connectors
- PCMCIA & ATA Hard Disk Drive (HDD)
- Two RS-232 transceivers and DB9 connectors (one configured for DCE and one for DTE operation) supporting on-chip UART ports
- External UART with RS-232 transceiver and DB9 connector
- Infrared transceiver that conforms to Specification 1.4 of the Infrared Data Association
- USB Host (HS & FS), USB OTG (HS & HS) interface
- Separate LCD panel assembly that connects to the main board
- Separate keypad unit with 36 push button keys
- Separate CMOS Image Sensor Card
- A 3.5 mm headset jack, a 3.5 mm line out jack, a 3.5 mm line in jack, a 3.5 mm microphone jack and a 2.5 mm microphone and headset jack
- Cirrus Logic CS8900A-CQ3Z Ethernet controller (10BASE-T), with RJ-45 connector
- AMD AM79C874 NetPHY (10BASE-T & 100BASE-X), with RJ-45 connector
- Two 32 × 3-pin DIN expansion connectors with most i.MX27 I/O signals
- Variable resistor for emulation of a battery voltage level
- NAND Flash card (Plugs into Main Board) which is included in the ADS kit
- LED indicators for power, Ethernet activity, and two LEDs for user defined status indication
- Universal power supply with 5 volt output @ 5 Amperes
- USB, RS-232 and RJ45 cables available in kit
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