Digi ConnectCore XP 270 Application guide

Part number/version: 90000759_C
Release date: August 2007
www.digi.com
ConnectCore™XP 270
Hardware Reference

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Contents
n n n n n n n iii
Documentation updates .............................................................. viii
Chapter 1: About the Module ................................................................................... 1
Intel XScale PXA270 ..................................................................... 2
ConnectCore XP 270 module ........................................................... 3
Using the ConnectCore XP 270 chip select.................................... 5
Reset Logic......................................................................... 6
Watchdog .......................................................................... 6
Clock signals ....................................................................... 7
Flash memory ..................................................................... 7
SDRAM memory.................................................................... 7
Power Management Chip for PXA270 processor .............................. 8
Ethernet Controller............................................................... 9
External schematics for SMSC LAN91C111 Ethernet Controller........... 10
1-Wire EEPROM................................................................... 12
USB................................................................................. 14
UARTs.............................................................................. 20
SSP Serial Ports................................................................... 21
I²C Bus Interface ................................................................. 22
PC Card and CompactFlash Interface......................................... 22
MultiMedia Card / SD / SDIO Controller + Memory Stick................... 23
LCD Controller.................................................................... 24
AC’97 Controller ................................................................. 27
Pulse Width Modulator Controller ............................................. 27
Connector pinout ....................................................................... 28
ConnectCore XP pinouts: Connector X1 ...................................... 28

iv
ConnectCore XP pinouts: Connector X2 ...................................... 33
ConnectCore XP 270 GPIOs ............................................................ 36
Bidirectional GPIOs .............................................................. 37
ConnectCore XP 270 GPIO use ................................................. 37
GPIO Controller Register Summary............................................ 46
GPIOs used internally ........................................................... 47
ConnectCore XP 270 Memory Map.................................................... 48
Chapter 2: About the Development Board .................................................51
XScale .................................................................................... 52
What’s on the development board?.................................................. 53
General Precautions............................................................. 54
Installation............................................................................... 55
Replacing the module ........................................................... 55
Setting up basic and optional connections................................... 57
Hardware block diagram .............................................................. 58
LEDs and selection of Ethernet magnetics.......................................... 59
Jumpers .................................................................................. 59
Pin descriptions ......................................................................... 61
ConnectCore XP 270 X1 pinout ....................................................... 77
ConnectCore XP 270 X2 pinout ....................................................... 81
Chapter 3: ConnectCore XP 270 Customization ..................................87
Adding custom hardware to the development board ............................. 88
Custom development board design check list...................................... 88
Appendix A: ConnectCore XP 270 Module Specifications 91
Mechanical dimensions ................................................................ 92
Environmental information............................................................ 93
Power requirements.................................................................... 94
Layout considerations.................................................................. 94
Appendix A: JTAG-Booster for Intel XScale PXA270 97
Overview ................................................................................. 98
System requirements................................................................... 98

v
CD files ................................................................................... 99
Connecting your PC to the target system .......................................... 99
Initialization file JTAG270.INI .......................................................100
Supported Flash devices ..............................................................100
JTAG270 Parameter Description ....................................................101
Program a Flash Device ...............................................................103
Use: JTAG270 /P filename [optionlist] ......................................103
Options ...........................................................................103
Example with Intel PXA270...........................................................106
Support for Windows NT, Windows 2000 and Windows XP ......................107
Installation on a clean system ................................................108
Installation with an already installed version 5.x/6.x of Kithara .......108

Using This Guide
vii
Review this section for basic information about the guide you are using, as
well as general support and contact information.
About this guide
This guide provides information about the Digi ConnectCore XP 270, a fully
integrated system-on-chip solution on a 67.6 x 36.7mm card.
The ConnectCore XP 270 module is built on the Intel XScale processor PXA270,
flash and SDRAM memory, and the SMSC LAN91C111 Ethernet controller.
What’s in this guide
This table shows where you can find specific information in this guide.
To read about See
ConnectCore XP 270 module Chapter 1, “About the Module”
ConnectCore XP development board Chapter 2, “About the Development Board”
Customizing the ConnectCore XP 270 Chapter 3, “ConnectCore XP 270
Customization”
Module specifications Appendix A, “ConnectCore XP 270
Module Specifications
Using This Guide

Documentation updates
viii ConnectCore XP 270 Hardware Reference, Rev. C 08/2007
Conventions used in this guide
This table describes the typographic conventions used in this guide:
Related documentation
Intel® PXA27x Processor Family
Developer’s Manual
October 2004
Order Number: 280000-002
Documentation updates
Digi occasionally provides documentation updates on the Web site (www.digi.com/
support).
Be aware that if you see differences between the documentation you received in your
package and the documentation on the Web site, the Web site content is the latest
version.
Using the JTAG-Booster Appendix B, “JTAG -Booster for Intel
XScale PXA270”
To read about See
This convention Is used for
italic type Emphasis, new terms, variables, and document titles.
monospaced type Filenames, pathnames, and code examples.

www.digi.com ix
Customer support
To get help with a question or technical problem with this product, or to make
comments and recommendations about our products or documentation, use the
contact information listed in this table:
For Contact information
Technical support United States: [phone]
Other locations: [phone]
www.digi.com/support
www.digi.com

1
About the Module
CHAPTER 1
The ConnectCore XP 270 module is a fully integrated system-on-chip solution on a
67.6 x 36.7mm card — a system built on Intel XScale processor PXA270, flash and
SDRAM memory, and the SMSC LAN91C111 Ethernet controller.

Intel XScale PXA270
2 ConnectCore XP 270 Hardware Reference, Rev. C 08/2007
Intel XScale PXA270
Features
Intel XScale Technology highly scalable core from 104 MHz up to 520 MHz
Little Endian operation
Embedded Packaging: 23 x 23 mm with 1.0 mm ball pitch
Enhanced LCD Controller
Large Peripheral Set:
–USB Host / Client
–USB OTG
–PCMCIA / Compact Flash
–IrDA
–I²C
–AC97 Controller
–Full Function UART
–Bluetooth UART
–LCD controller
–SSP and NSSP Serial ports

www.digi.com 3
About the Module
Intel XScale PXA270 processor block diagram
ConnectCore XP 270 module
Features
32-bit Intel XScale PXA270 processor
64 Mbytes SDRAM memory (32-bit@100 MHz)
32 Mbytes Flash memory (32-bit)

ConnectCore XP 270 module
4 ConnectCore XP 270 Hardware Reference, Rev. C 08/2007
1 Full Function UART, 1 Bluetooth UART, 1 IrDA, 1 NSSP, 1 SSP serial port
I²C Bus
USB Host and/or USB Device
GPIOs and Interrupt signals
PCMCIA / Compact Flash interface
Multimedia Card/SD/SDIO Controller
LCD controller
10/100 Mbit/s Ethernet connection (through the SMSC chip LAN91C111)
1-wire EEPROM DS2431
AC’97 interface
PWM
DMA request pins
Complete external 32-bit interface available
Reset circuitry
Single +3.3V Power Supply
Integrated Power I2C interface
PMIC – Power Management IC supporting PXA270 DVM (Dynamic Voltage
Management)
JTAG interface

www.digi.com 5
About the Module
ConnectCore XP 270 module
Using the ConnectCore XP 270 chip select
PXA27x SDRAM FLASH ET H ERN ET
SILICON
NUMBER
CORE
VOLTAGE
RESET
CONTROLLER
X1 X2
+3.3V
Data, Address, Ethernet, AC97, LCD, UART, Bluetooth, PCMCIA,
USB, JTAG, NSSP, SSP, IrDA, Multimedia Card, GPIOs
Chip Select Use
CS0# Flash memory
CS1# Ethernet Controller – SMSC LAN91C111
CS2# Free for external use
CS3# Free for external use
CS4# Free for external use
CS5# Free for external use

ConnectCore XP 270 module
6 ConnectCore XP 270 Hardware Reference, Rev. C 08/2007
Reset Logic
The Connect Core XP 270 module has two reset signals:
RESET_IN#
RESET_OUT#
Both signals are low-active. If RESET_IN# is activated outside the module (through
reset controller or reset button), the signal is first debounced by the on-board reset
circuitry (MAXIM MAX6390XS29D4 chip) and a reset signal is transmitted to the PXA270
processor. The reset input of the PXA270 can also be activated by a power-on
sequence.
Once the processor receives the reset input signal, it resets its internal peripherals
and a processor specific output reset signal — RESET_OUT# — becomes active. This
signal is available on ConnectCore XP 270 connectors.
On-board flash memories receive the reset signal through the RESET_IN# pin and the
Ethernet controller receives the reset signal through the RESET_OUT# signal.
Intel PXA270 power-on sequence timing is fully respected on the ConnectCore XP 270
module — no special care has to be taken outside the module. For more information
about power on timing, see “Intel PXA270 Processor Electrical, Mechanical and
Thermal Specification – Order Number 280002-004 p.64.”
Watchdog
The Intel XScale PXA270 processor comes with a watchdog unit. The processor’s
OSCR0 register can be programmed to generate a watchdog-reset signal. When the
OWER[WME] field is set, the OSCR0 register is compared to the OSMR3 register every
rising edge of the internal-made 3.25MHz clock.
If a match is detected, the OS timer asserts the internal WDOG_RST pin, which
asserts the RESET_OUT# pin. A reset is applied to the PXA270 processor and most
internal states are cleared.
Once enabled, the watchdog function can be disabled only by one of the reset
functions (hardware reset, watchdog reset, or GPIO reset). Writing a zero to the
Watchdog Match Enable bit after it has been set has no effect.
For more information about the watchdog unit, see the “Intel PXA27x Processor
Family Developer’s Manual – Order Number: 280000-002”.

www.digi.com 7
About the Module
Clock signals
The processor needs two clock signals:
The 13-MHz processor oscillator provides the primary clock source for the
PXA270 processor. The on-chip PLL frequency multipliers and several
peripheral modules use the processor oscillator as a reference. If the
application has not enabled the 32.768-kHz timekeeping oscillator, the
processor oscillator also drives the real-time clock (RTC) and power
manager.
The 32.768-kHz timekeeping oscillator is a low-power, low-frequency
oscillator that clocks the real-time clock (RTC) and power manager.
Both clock sources are used and implemented on the ConnectCore XP 270 module.
Flash memory
The ConnectCore XP 270 module support two Intel StrataFlash Flash Memory chips.
Each chip is 16-bit wide, making a whole 32-bit Flash Memory area. All accesses to
the flash memory are made with 32-bit words.
The Flash Memory chips are controlled by CS0#, so the module can support a
maximum of 64MB of memory. Flash Memory chips have an initial access speed of
120ns and a block sector size of 64-Kword (= 128-Kbyte).
The Flash Memories reset signal is connected to the RESET_IN# input signal. With this
choice, Flash Memories aren’t reset for software reset events such as sleep mode,
watchdog reset, and GPIO reset.
SDRAM memory
Intel PXA270 processor supports a SDRAM interface at a maximum frequency of 104
MHz. On the ConnectCore XP 270 module, two SDRAM memory chips have been
connected to the processor SDRAM partition 0 (controlled by SDCS0# signal).
There are two possible considerations regarding the size of SDRAM partition on a
PXA270-based product:
Use a normal 256-Mbyte memory map; in this case, the SDRAM partition is
64-Mbyte wide.

ConnectCore XP 270 module
8 ConnectCore XP 270 Hardware Reference, Rev. C 08/2007
Use a large 1-Gbyte memory map; in this case, the SDRAM partition is
256-Mbyte wide. This memory map allows the possibility of connecting to
bigger SDRAM chips.
Note: As far as SDRAM signals available on ConnectCore XP 270 module connectors,
the signals are available as references only. The module has not been adapted
to support SDRAM memory outside the module, nor “length-adapted” to
support PXA270 SDRAM timing.
Power Management Chip for PXA270 processor
The ConnectCore XP 270 module comes with an integrated chip that manages Intel
XScale PXA270 voltages and can implement some minor power management
functions. The chip is a versatile power management IC designed especially for the
XScale type of processors. The chip contain three regulators, which share a common
enable pin. When disabled using the enable pin, the chip enters a low-power state.
To assure stability and minimize overshoot at start-up and during DVM transitions,
Power Management IC implements a controlled rise time of each regulator output.
This is a short list of available features implemented by the PMIC (Power Management
Integrated Circuit):
Three voltage regulators (1 Buck for core voltage, 2 LDOs for SRAM, and PLL
voltage)
Full-integrated synchronous buck regulator with DVM (Dynamic Voltage
Management) — 800mA DC output current
I²C interface module for DVM from 0.58V to 1.6V
Battery fault signal
Input supply voltage range: 2.76V – 5.5V
4x4 mm QFN package
Note: The power management chip doesn’t control all the XScale PXA270 voltages.
The other voltages (VCC_LCD, VCC_MEM, VCC_IO, VCC_BB, VCC_USB) are
controlled directly by a MOS switch from main +3.3 Vdc power supply.

www.digi.com 9
About the Module
Ethernet Controller
The ConnectCore XP 270 module provides an Ethernet connection (Link + PHY Layer)
directly on the module board. This connection is made with the LAN91C111 chip from
SMSC.
These are features of the chip:
10/100 non-PCI Ethernet Single Chip Ethernet Controller (MAC + PHY)
Fully supports Full Duplex Switched Ethernet
Supports burst data transfer
8 Kbytes internal memory for receive and transmit FIFO buffers
Supports 16 and 32-bit CPU accesses
Internal 32 bit wide data path (into packet buffer memory)
3.3V operation with 5V tolerant I/O buffers
Single 25 MHz reference clock for both PHY and MAC
128-pin TQFP package, 1.0 mm height
Industrial temperature range from -40°C to 85°C
Fully integrated IEEE 802.3/802.3u - 100BASE-TX/10BASE-T physical layer
Auto negotiation: 10/100, full/half duplex
LED outputs (user selectable, up to 2 LED functions at one time): link,
activity, full duplex,10/100, transmit, and receive
The Intel PXA270 processor CS1# signal enables accesses to the Ethernet Controller
chip. Although the chip can be accessed in 8, 16, and 32-bit accesses, ConnectCore
XP 270 has been designed to support only 16-bit and 32-bit accesses.
The memory area reserved for the ConnectCore XP 270 Ethernet Controller is
0x0400 0300 to 0x0400 030F. Accesses to the chip are made with the PXA270
processor’s VLIO (Variable Latency) interface. LAN91C111 has no special external
EEPROM, but receive the MAC address from the 1-wire EEPROM.
The LAN91C111 interrupt pin is connected to the PXA270 processor GPIO90 pin.

ConnectCore XP 270 module
10 ConnectCore XP 270 Hardware Reference, Rev. C 08/2007
External schematics for SMSC LAN91C111 Ethernet Controller
This diagram shows the external components needed for implementing Ethernet
connectivity on a product based on the ConnectCore XP 270 module. SMSC has a
reference design for their LAN91C111 chip (see http://www.smsc.com). SMSC also
provides an application note, where suggested magnetics are listed (application note
8- 13).
The most important component is the isolation transformer module. Because the
ConnectCore XP 270 uses a supply voltage of 3.3V, a transformer module with a 1:1
ratio between the primary and the secondary windings on the receive side and a ratio
of 1:1 for the Tx path must be used.
These are recommended transformers; this information comes from SMSC application
note 8-13.
4x75Ω
ConnectCore XP270
LAN91C111
+3.3V
49.9 Ω
10n
24 Ω
24Ω
TRANSFORMER
+3.3V
+3.3V
+3.3V
330Ω
330ΩLAN Activity
LED1
LED2
RX+
RX-
TX+
TX-
1
2
3
4
5
6
7
8
RJ45
1nF / 2kV
LINK Status