Digi Connect ME
Hardware Reference
Digi International Inc. 2003. All Rights Reserved.
The Digi logo is a registered trademark of Digi International,
Inc.
Connectware and Digi Connect ME are trademarks of Digi
International, Inc.
NetSilicon, NET+W orks, NET+OS, and NET+ are trademarks
of NetSilicon, Inc.
All other trademarks mentioned in this document are the
property of their respectiv e owners.
Information in this document is subject to change without
notice and does not represent a commitment on the part of
Digi International.
Digi provides this document “as is,” without warranty of any
kind, either expressed or impl ied, including, bu t not limited to,
the implied warranties of fitness or merchantability for a
particular purpose. Digi may make improvements and/or
changes in this manual or in the product(s) and/or the
program(s) described in this manual at any time.
This product could include technical inaccuracies or
typographical errors. Changes are periodically made to the
information herein; these changes may be incorporated in
new editions of the publication.
Contents
About This Document................................................................................................................v
Chapter 1: About the Digi Connect ME Module................................................................1
Overview..........................................................................................................................1
Types of modules.............................................................................................................2
Dimensions.......................................................................................................................3
Recommended PCB layout ..............................................................................................4
Connectors: power and device interface..........................................................................5
Connectors: Ethernet interface.........................................................................................7
LEDs.................................................................................................................................8
Chapter 2: About the Development Board .........................................................................9
Overview..........................................................................................................................9
Basic description............................................................................................................10
Port descriptions......................................................................................... ....................12
Connectors and blocks....................................................................................................16
Switches..........................................................................................................................21
LEDs...............................................................................................................................23
Power jack........................ ...... ............................................. .......................................... .26
Test points ......................................................................................................................27
n n n n n n n iii
Chapter 3: Programming Considerations ........................................................................ 29
Overview........................................................................................................................29
GPIO ..............................................................................................................................30
LEDs ..............................................................................................................................32
Reset............................................................................................................................... 33
Flash............................................................................................................................... 34
Memory..........................................................................................................................34
Appendix A Module Specifications.................................................................................... 35
Mechanical..................................................................................................................... 35
Environmental................................................................................................................35
Network interface........................................................................................................... 36
Serial interface ............................................................................................................... 36
Data rates (bps) .............................................................................................................. 36
Flow control options ...................................................................................................... 36
GPIO ..............................................................................................................................37
DC characteristics.......................................................................................................... 37
Appendix B Certifications..................................................................................................39
FCC Part 15 Class B...................................................................................................... 39
Industry Canada.............................................................................................................40
Declaration of Conformity............................................................................................. 41
International EMC standards .........................................................................................42
Safety standards .......................................... ...... ............................................. ................ 42
iv n n n n n n n
•
Objective
Audience
About This Document
•••••••••••••••••••••••••••••••••••••••••••••••••••••••
The purpose of this document is to enable developers to integrate the Digi Connect ME
embedded module with other devices, enabling these devices to make use of the module’s
rich networking features.
This document is written for hard- and software developers who are responsible for
designing networked devices.
n n n n n n n v
vi n n n n n n n
Digi Connect ME Hardware Reference
Overview
About the Digi Connect ME
Module
CHAPTER 1
The Digi Connect ME embedded module provides fully transparent device connectivity
over industry-standard Ethernet connections and allows both equipment manufacturers and
systems integrators to network-enable products at a fraction of the time and cost required to
develop a custom solution. It is a highly flexible and compact single component solution
with a serial port, GPIO ports, and a robust on-board TCP/IP stack and 10/100 BASE-T
Ethernet support.
From medical systems to building control and industrial automation, in virtually any
application where embedded device connectivity over Ethernet is needed, the Digi Connect
ME embedded module is the ideal choice, delivering high-performance functionality .
This chapter provides information about the module hardware and contains the following
topics:
! "Types of modules" on page 2
! "Dimensions" on page 3
! "Recommended PCB layout" on page 4
! "Connectors: power and device interface" on page 5
! "Connectors: Ethernet interface " on page 7
! "LEDs" on page 8
n n n n n n n 1
Types of modules
Types of modules
The type of module that you will use for hardware integration depends on the kit you are
using. If you are using an integration kit, you will be using a module without a JTAG
interface. If you are using a development kit, you will be using a module with a JT AG
interface.
Note
The following figures show the two types of modules.
JTAG is a commonly used term that is also referred to as IEEE 1149.1, an
industry standard test protocol. JTAG is an abbreviation for the
European Joint Test Action Group, which invented th e first versions of
the IEEE 1149.1 interface. The JTAG interface, along with the other
development tools, enables you to downlo ad, r un and debug pr ograms
on the module.
2 n n n n n n n
00000018
Module without JTAG Interface
JTAG interface
00000017
Module with JTAG Interface
Dimensions
About the Digi Connect ME Module
The following figures show the dimensions of Digi Connect ME embedded module.
LED
.750
[19,05]
.715
18,16[]
.070
[1,778]
.050
1,27[]
.720
[18,288]
Dimensions: Front View
LED
TOLERANCES:
in [mm]
.010 [,254]
TOLERANCES:
in [mm]
.010 [,254]
00000026
PIN 1
.050
1,27[]
.360
9,14[]
.050
1,27[]
.450
11,43[]
Dimensions: Bottom View
.440
11,18[]
0000027
n n n n n n n 3
Recommended PCB layout
]
.735
.854
FRONT
18,67[]
21,69[]
Dimensions: Side View
Recommended PCB layout
The following figure shows the recommended PCB (printed circuit board) layout of the
Digi Connect ME embedded module.
.351
8,91[]
1.150
29,21[]
1.216
1.445
[36,703]
30,87[]
.300
[7,62]
.715
.804
18,16[]
20,42[]
TOLERANCES:
in [mm]
.010 [,254]
REAR
00000028
4 n n n n n n n
SHIELD OUTLINE
FRONT
TOLERANCES:
in [mm]
.010 [,254]
.720
[18,288]
Ø
.06
[1,524]
The 0.060" diameter
holes (x4) must be
plated and
connected to a solid
logic ground plane.
.815
[20,701]
.799
[20,295]
Recommended PCB Layout
PIN 1
.070
[1.778]
Ø
.023
[0,5842]
.050
[1,27]
.450
[11,43
00000023
.050
[1,27]
Connectors: power and devi ce interface
The module has a 20-pin male connector that supports a serial interface with data rates up
to 230,400 bps and full-modem control, and GPIO ports. See the following figure for pin
orientation and the table for pin assignments.
Note
Digi recommends 100 pF capacitors to ground on all inputs and o utpu ts to the
module for ESD immunity. This does not
pins.
About the Digi Connect ME Module
apply to the power pass-thru
Pin 1
Module
front
Pin 19
Bottom view
Power and Device Interface Connector
Pin 2
Pin 20
00000019
n n n n n n n 5
Connectors: power and device interface
Pin Signal Description Pin Signal Description
1 VETH+ Power Pass-Thru + 11 CTS / GPIO 2 Clear to Send (Input) / GPIO
2 VETH- Power Pass-Thru - 12 DSR / GPIO 3 Da ta Set Ready (Input) / GPIO
3 — Position Removed 13 DCD / GPIO 1
4 — Position Removed 14 RESET Reset
5 — Position Removed 15 +3.3V Power
6 — Position Removed 16 GND Ground
7 RXD Receive Data (Input) 17 — Reserved. Do not connect.
8 TXD Transmit Data (Output) 18 — Reserved. Do not connect
9 RTS / GPIO 4 Request to Send (Output) / GPIO 19 — Reserved. Do not connect
10 DTR / GPIO 5
Data Terminal Ready (Output) / GPIO
20 /INIT GPIO--See "Digi Connect ME
Data Carrier Detect (Input) / GPIO
GPIO pin use" on page 31 and
"Reset" on page 33.
Power and Device Interface Connector Pin Assignments
6 n n n n n n n
Connectors: Ethern et interface
The Ethernet connector is an 8-wire RJ-45 jack that meets the ISO 8877 requirements for
10/100BASE-T. See the following figure and table for pin orientation and pin assignments.
Note
Pin orientation and assignments are the same for modules with or wit hout a
JTAG connector.
Pin 8
About the Digi Connect ME Module
Pin 1
00000021
Ethernet Interface Pin Orientation
Pin Signal Description Pin Signal Description
1 TXD+ Transmit Data + 5 EPWR+ Power from Swit c h +
2 TXD- Transmit Data - 6 RXD- Receive Data -
3 RXD+ R ecei ve Data + 7 EPWR- Power from Switch -
4 EPWR+ Power from Switch + 8 EPWR- Power from Switch -
Ethernet Interface Pin Assignments
n n n n n n n 7
LEDs
LEDs
The module has two LEDs that are located near the upper corners of the Ethernet port (see
the following figure). The following table describe s the LEDs.
Note
The LEDs are the same for a module with or without a JTAG connector.
Network
Link
Network Activity/
Diagnostic
00000030
LED Locations
LED Color Description
Network Link (left-upper) Yellow Network Link is operational: On (continuously)
indicates that an Ethernet connection is made.
Network Activity/Diagnostic
(right-upper)
Green Network Activity: On when network traffic
detected; off when no network traffic detected.
8 n n n n n n n
Diagnostic: Flashes three times in even duration
during power up or reset, indicating successful
startup.
LED Descriptions
Overview
About the Development
Board
CHAPTER 2
The development board is a hardware platform from which you can determine how to
integrate the Digi Connect ME embedded module into your design. The board consists of
the following main features:
! Socket for connecting the Digi Connect ME embedded module
! JTAG connection (for use with the development kit only)
! GPIO switches
! Serial and GPIO ports
! Power input
This chapter provides information on development board components and contains the
topics listed below. For more detailed information on the development board, see the
schematic and mechanical drawings on the CD that accompanies your integration kit or
development kit. (If you have installed the integration kit or development kit, you can access
the schematic from the Start menu.)
! "Basic description" on page 10
! "Placement of Module" on page 12
! "Connectors and blocks" on page 16
! "Switches" on page 21
! "LEDs" on page 23
! "Power jack" on page 26
n n n n n n n 9
Basic descr iption
8
P8
1
P11
C
CR2
P
P3
CR16
CR16
CR6
CR6
CR15
CR15
P6
P6
SW2
SW2
P9
P9
SW3
SW3
CR4
CR4
9
CR9
CR5
CR5
CR1
CR1
P7
P7
P
P2
SW1
SW1
P1
CR8
CR8
CR7
CR7
C
CR11
CR10
CR10
CR13
CR13
CR12
CR12
C
CR14
CR3
CR3
C
CR17
P
P12
! "Test points" on page 27
Note
Basic description
The development board contains connectors, switches, and LEDs for use while integrating
the Digi Connect ME embedded module into your design. See the following figure for the
location of the connectors, switches, and LEDs. Additionally, the board provides test points
(not shown on the figure). For more information about test points, see "Test points" on page
27.
The development board contains some components that are used with other
Digi embedded products and are noted as such in this document.
1
2
2
3
4
5
6
7
8
P
R2
R11
12
R14
R17
3
CR
P1
9
10
11
12
13
14
15
16
00000005
10 n n n n n n n
Digi Connect ME Hardware Reference
About the Development Board
Basic Description: Connectors, Switches and LEDs
# Description # Description
1 Secondary Serial Port, P2 9 Primary Serial Port, P1
2 LEDs, CR1 through CR9 10 GPIO Port, P3
3 GPIO Switch Bank, SW1 11 LEDs, CR10 through CR14
4 GPIO Switch Bank, SW2 12 Digital Signal Monitor Jack, P6
5 JTAG Header, P4 13 LEDs, CR15 and CR16
6 Jumper Block, P12 (Reserved) 14 Reset Switch, SW3
7 Digi Connect ME embedded
15 LED, CR17
module Connector, P7
8 Digi Connect ME embedded
16 Power Jack, P11
module JTAG Connector, P8
Connectors, Switches and LEDs
Caution
For more detailed information on connectors, switches and LEDs, see the following:
! "Port descriptions" on page 12
! "Connectors and blocks" on page 16
! "Switches" on page 21
! "LEDs" on page 23
! "Power jack" on page 26
The development board accepts either of the following modules:
! Module without JTAG connector—for use with an integration kit
When handling the development board, wear a gr oundi ng wrist st r ap to
avoid ESD damage to the board.
n n n n n n n 11
Port descripti ons
! Module with JTAG connector—for use with a development kit
See the following figures for placement of either module onto the development board.
Module with
JTAG connector
Development
board
Module connector
Module JTAG
connector
00000015
Placement of Module
Caution
Port descriptions
The development board provides the following ports:
! Primary serial port, P1
! Secondary serial port, P2
! GPIO port, P3
See the figure titled "Basic Description: Connectors, Switches and LEDs" on page 11 for
the location of the ports. The following sections describe the ports.
If you handle the module, wear a grounding wri st strap t o avoi d ES D
damage.
12 n n n n n n n
Digi Connect ME Hardware Reference
Primary serial port, P1
The Primary Serial Port is a DB-9 male connector that is labeled as P1 on the development
board. The port is used with the integration kit and the development kit. See the following
figure for pin orientation; see the following table for pin assignments.
About the Development Board
Pin 1
Pin 6 Pin 9
Pin 5
0000006
Primary Serial Port Pin Orientation
Pin Signal Description
1 DCD Data Carrier Detect
2 RXD Receive Data
3 TXD Transmit Data
4 DTR Data Terminal Ready
5 GND Signal/Chassis Ground
6 DSR Data Set Ready
7 RTS Request To Send
8CTS Clear To Send
9— —
Primary Serial Port Pin Assignments
n n n n n n n 13
Port descripti ons
Secondary serial port, P2
The Secondary Serial Port is a DB-9 male connector that is labeled as P2 on the
development board. The port is used only with the Digi Connect ME modules with JTAG
interfaces (in the development kit) for debugging purposes. See the following figure for pin
orientation; see the following table for pin assignments.
Pin 1
Pin 6 Pin 9
Pin 5
0000006
Secondary Serial Port Pin Orientation
Pin Signal Description
1— —
2 RXD Receive Data
3 TXD Transmit Data
4— —
5 GND Signal/Chassis Ground
14 n n n n n n n
6— —
7— —
8— —
9— —
Secondary Serial Port Pin Assignments
Digi Connect ME Hardware Reference
GPIO port, P3
About the Development Board
The GPIO port is a 10-pin male right-angle connector that is labeled as P3 on the
development board. The port is used with the integration kit and the development kit. See
the following figure for pin orientation; see the following tables for pin assignments. For
input and output threshold specifications, se e "DC characteristics" on page 37.
Note
The development board is shipped with a 10- pin scr ew-fl ange plug at tached to
the GPIO port.
Pin 1 Pin 10
0000020
GPIO Port Pin Orientation
Pin Sign al Name Pin Signal Name
1 GND 6 GPIO-3
2GPIO-5 7GND
3 GND 8 GPIO-2
4GPIO-4 9GND
5 GND 10 GPIO-1
GPIO Port Pin Assignments
n n n n n n n 15
Connectors and blocks
Connectors and blocks
The development board provides the following connectors and blocks:
! Digi Connect ME embedded module connector, P7
! Module JTAG interface connector, P8
! JTAG debugger connector, P4
! Jumper block, P12
! Digital Signal Analyzer Header, P6
See the figure titled "Basic Description: Connectors, Switches and LEDs" on page 11 for
the location of the connectors and blocks. The following sections describe the connectors
and block s.
Digi Connect ME embedded module connector, P7
The Digi Connect ME embedded module Connector is a 20-pin female vertical header that
is labeled P7 on the development board. The connector is used with the integration kit and
the development kit. See the following figure for pin orientation; see the following table for
pin assignments.
16 n n n n n n n
Note: The figure shows the connector using the same orientation as shown in
the figure titled "Basic Description: Connectors, Switches and LEDs" on page
11
.
Pin 19
Pin 1
Pin 20
Pin 2
00000008
Module Connector Pin Orientation
Digi Connect ME Hardware Reference
About the Development Board
Pin Signal Description
1 VETH+ Power Pass-Thru +
2 VETH- Power Pass-T h ru -
3 — Position Removed
4 — Position Removed
5 — Position Removed
6 — Position Removed
7 RXD Receive Data (Input)
8 TXD Transmit Data (Output)
9 RTS / GPIO-4 Request to Send (Output) / GPIO
10 DTR / GPIO-5 Data Terminal Ready (Output) / GPIO
11 CTS / GPIO-2 Clear to Send (Input) / GPIO
12 DSR / GPIO-3 Data Set Ready (Input) / GPIO
13 DCD / GPIO-1 Data Carrier Detect (Input) / GPIO
14 RESET Reset
15 +3.3V Power
16 GND Ground
17 — Reserved. Do not connect.
18 — Reserved. Do not connect.
19 — Reserved. Do not connect.
20 /INIT GPIO--See "Digi Connect ME GPIO pin use" on
page 31 and "Reset" on page 33
Module Connector Pin Assignments
n n n n n n n 17
Connectors and blocks
Module JTAG interface connector, P8
The Module JTAG Interface Connector is a 14-pin female vertical header that is labeled P8
on the development board. The connector mates with the JTAG connector on the Digi
Connect ME embedded module. The Module JT AG Connector pins are tied to the JTAG
debugger Connector (see “JTAG debugger connector, P4”).
Note
Because there is no direct connection to the Modul e JTAG Interface Connector ,
pin orientation and pin assignments are not describe d for the connector.
JTAG debugger connector, P4
The JTAG debugger connector is a 14-pin male vertical header that is labeled P4 on the
development board. The connector mates with a JT AG debugger plug (for example, a
Macraigor Raven). The connector is used with the development kit only. See the following
figure for pin orientation. See the following table for pin assignments.
Note
The figure shows the connector using the same orientati on as shown in t he
figure titl e d "Basic Description: Connectors, Switches and LEDs" on
page 11.
18 n n n n n n n
Pin 13 Pin 1
Pin 14 Pin 2
JTAG Debugger Connector Pin Orientation
Digi Connect ME Hardware Reference
00000011
About the Development Board
Pin Signal Pin Sign al
1VCC+ 8GND
2 GND 9 TCKRXD
3/TRST 10GND
4 GND 11 TDO
5 TDI 12 ICETRST
6 GND 13 VCC+
7TMS 14GND
JTAG Debugger Connector Pin Assignments
Jumper block, P12
This jumper block is reserved for future use.
Digital Signal Analyzer Header, P6
The Digital Signal Analyzer Header is a 16-pin male vertical header that is labeled P6 on
the development board. The header is for connecting a digital signal analyzer (for example,
a logic analyzer) to the development board. The header is used with the development kit
only. See the following figure for pin orientation; see the following table for pin
assignments.
Note
The figure shows the connector using the same orientati on as shown in t he
figure titl e d "Basic Description: Connectors, Switches and LEDs" on
page 11.
n n n n n n n 19
Connectors and blocks
Pin 1
Pin 19
Pin 2
Pin 20
00000013
Digital Signal Analyzer Header Pin Orientation
Pin Signal Pin Sign al
1 Not connected 11 GPIO-5
2 Not connected 12 TXD2
3 Not connected 13 GPIO-4
4 Not connected 14 RXD2
20 n n n n n n n
5 Not connected 15 GPIO-3
6 Not connected 16 TXD
7 Not connected 17 GPIO-2
8 Not connected 18 RXD
9/RST 19GPIO-1
10 Not connected 20 G ND
Digital Signal Analyzer Header Pin Assignments
Digi Connect ME Hardware Reference
Switches
The development board provides the following switches:
! GPIO switch bank 1, SW1
! GPIO switch bank 2, SW2
! Reset, SW3
See the figure titled "Basic Description: Connectors, Switches and LEDs" on page 11 for
the location of the switches. The following sections describe the switches.
GPIO switch bank 1, SW1
GPIO Switch Bank 1, labeled SW1, is a set of five slide switches that allows the Digi
Connect ME embedded module to use either serial signals or GPIO signals to communicate
with a device. The switch is used with the Digi Connect ME embedded module Integration
Kit and the Digi Connect ME embedded module Development Kit. In addition, the switch
is used in conjunction with GPIO Switch Bank 2, SW2. See the following table for switch
definitions of GPIO Switch Bank 1.
About the Development Board
Switch
Left Position Right Position
Number
1DCD GPIO-1
2CTS GPIO-2
3DSR GPIO-3
4RTS GPIO-4
5DTR GPIO-5
GPIO Switch Bank 1 Settings
n n n n n n n 21
Switches
GPIO switch bank 2, SW2
GPIO Switch Bank 2, labeled SW2, is a set of five slide switches that set GPIO inputs to
logic levels of high (switch to left) or low (switch to right).
If the GPIO port is configured as an output, then the switch should always be to the left. If
there is an external device connected to P3, the switch should always be set to the left.
Each GPIO port can be used independently.
Notes
1 These switches do not determine whether the GPIO is an input or output. That is
determined by the module software.
2 If G P IO is set to an output by software, switch SW2 must be set to the left (high).
3 These switches are used with the integration kit and the developm ent kit and in
conjunction with GPIO Switch Bank 1, SW1.
Reset, SW3
22 n n n n n n n
The Reset switch is a push button switch labeled SW3 on the development board. Pressing
the switch holds the Digi Connect ME embedded module in reset. When the push button is
released, the module reboots.
Digi Connect ME Hardware Reference
LEDs
About the Development Board
The development board contains 17 LEDs that are labeled CR1 through CR17. The
following table lists and describes the LEDs.
Board
Description
Color or State
Indication
Label
CR1 TXD, Secondary Serial Port Flickering Serial activity
Green Inactive
CR2 RXD, Secondary Serial Port Flickering Serial activity
Green Inactive
CR3 CTS, Prim ary Serial Port Yellow Active
Green Inactive
Off Not connected or signal not
being driven
CR4 DTR, Primary Serial Port Yellow Active
Green Inactive
Off Not connected or signal not
being driven
CR5 TXD, Primary Serial Port Flickering Serial activity
Green Inactive
CR6 RXD, Primary Serial Port Flickering Serial activity
Green Inactive
n n n n n n n 23
LEDs
Board
Description
Color or State
Indication
Label
CR7 RTS, Prim ary Serial Port Yellow Active
Green Inactive
Off Not connected or signal not
being driven
CR8 DCD, Primary Serial Port Yellow Active
Green Inactive
Off Not connected or signal not
being driven
CR9 DSR, Primary Serial Port Yellow Active
Green Inactive
Off Not connected or signal not
being driven
24 n n n n n n n
CR10 GPIO-1 Input/Output On Logic high
Off Logic low
CR11 GPIO-2 Input/Output On Logic high
Off Logic low
CR12 GPIO-3 Input/Output On Logic high
Off Logic low
CR13 GPIO-4 Input/Output On Logic high
Off Logic low
Digi Connect ME Hardware Reference
About the Development Board
Board
Description
Color or State
Indication
Label
CR14 GPIO-5 Input/Output On Logic high
Off Logic low
CR15 3.3V Indicator On Powe r on
Off Power off
CR16 5V Indicator On Power on
Off Power off
CR17 EPWR, Powered Ethernet
Enabled
On Ethernet power present from
external powered Ethernet
connector (Ethernet hub or
switch)
Off No powered Ethernet voltage
LED Descriptions
n n n n n n n 25
Power jack
Power jack
The Power Jack is a barrel c onnector that accepts 9 to 30 VDC + /- 5%. The jack is label ed
as P11 on the development board. The following table shows the polarity of the power jack.
Contact Polarity
Center +9 to +30 VDC
Outer Ground
Power Jack Polarity
The following figure schematically represents the polarity of the power jack.
Ground
+9 to +30 VDC
00000014
Power Jack Polarity, Schematic
26 n n n n n n n
Digi Connect ME Hardware Reference
Tes t points
About the Development Board
The development board provides 24 test points that can be identified by board label or test
point number. The board labels are adjacent to each test point on the board. The test point
numbers are in the development board schematic drawings. The following table lists the
test point number, board label, and a brief description of each test point.
Test
Point
TP1 RI RI (test point supported
TP2 TX TXD-2, Tran smit,
TP3 RX RXD-2, Receive,
TP4 CTS CTS, Primary Serial Port TP16 GND Ground
TP5 DTR DTR, Primary Serial Port TP17 3.3V 3.3V Supply
TP6 TX TXD, Primary Serial Port TP18 GND Ground
TP7 RX RXD, Primary Serial Port TP19 5V 5.0V Supply
TP8 RTS RTS, Primary Serial Port TP20 RESET Reset (active low)
TP9 DCD DCD, Primary Serial Port TP21 E+ Ethernet Power +
Board
Label
Description Test
Point
TP13 GPIO3 GPIO-3
only)
TP14 GPIO4 GPIO-4
Secondary Serial Port
TP15 GPIO5 GPIO-5
Secondary Serial Port
Board
Label
Description
TP10 DSR DSR, Prima ry Serial Port TP22 E- Ethernet Power -
TP11 GPI O 1 GPIO-1 TP23 V-IN 9-30 VDC Input
TP12 GPIO2 GPIO-2 TP24 GND Ground
Test Point Descriptions
n n n n n n n 27
Test points
28 n n n n n n n
Digi Connect ME Hardware Reference
Overview
Programming
Considerations
CHAPTER 3
This chapter provides information programmers may require to make use of some Digi
Connect ME hardware resources. It provides information on the following topics:
! "GPIO" on page 30
! "LEDs" on page 32
! "Reset" on page 33
! "Flash" on page 34
! "Memory" on page 34
n n n n n n n 29
GPIO
GPIO
General informa tion
The NS7520 processor supports 16 general purpose I/O (GPIO ) lines, some of which are
reserved for specific functions and some of which can be customized. These GPIO lines
fall into three categories:
! Those labeled “Reserved” in the following table are reserved for a specific use
! Those labeled “Allocated” in the following table are exposed to an external
! Those labeled “Available” are exposed to an external interface, not controlled
T wo registers govern the 16 GPIO lines. These registers are named PORTA and PORTC.
Each GPIO pin has four bits which completely describe its behavior, and each register is
responsible for eight GPIO pins. The four bits that describe the GPIO behavior are its mode
(CMODE), its direction (CDIR), its special function (CSF--only applicable to PORTC),
and the data value. The first three bits describe the functionality of the GPIO pin. The
"data" bit provides the current value of the pin when read and allows one to control the
value of an output pin when written.
and must not
be reprogrammed, or the unit might not operate correctly. Often,
these lines are not connected to external interfaces.
interface and allocated to a specific use by the software, but can be customized
safely with code modifications.
directly by the software, and can be customized.
30 n n n n n n n
In order to configure any GPIO pin as a GPIO input, the corresponding bit positions in the
appropriate register must be configured as:
CMODE = 0 CDIR = 0 CSF = 0
In order to configure any GPIO pin as a GPIO output, the corresponding bit positions in the
appropriate register must be configured as: CMODE = 0 CDIR = 1 CSF = 0
Since each register controls 8 GPIO lines, it is safest to read the full 32 bit register, modify
the bits corresponding to the GPIO line of interest, a nd then write the full 32 bits back. In
this way, the behavior of the other GPIO lines will be preserved. For more information
regarding the format and programming of the GPIO registers, see the NS7520 Hardware
Reference.
Digi Connect ME Hardware Reference
Digi Connect ME GPIO pin use
Programming C onsiderations
Name Register
Bit
Serial
transmit
DTR/
GPIO5
RTS/
GPIO4
NA PORTA4 Reserved NA NA
Serial
receive
DSR/
GPIO3
PORTA7 Allocated Pin 8 on the 20
PORTA6 Allocated Pin 10 on the 20
PORTA5 Allocated Pin 9 on the 20
PORTA3 Allocated Pin 7 on 20 pin
PORTA2 Allocated Pin 12 on 20 pin
Category External
Interface
pin head e r
pin head e r
pin head e r .
header,
header
Description
Used for serial transmit. It could be reassigned as
GPIO input or output and used for a general
purposes.
Used for the serial DTR signal. It can be reassigned
as either GPIO input or output and used for a
general purpose. If used in conjunction with the
development board, this pin maps to GPIO5.
Used for the serial RTS signal. It could be
reassigned as either GPIO input or output and used
for a general purpose. If used in conjunction with
the development board, this pin maps to GPIO4.
Used for serial receive. It could be reassigned as
either GPIO input or output and used for a general
purpose.
Used for the serial DSR signal. It could be
reassigned as either GPIO input or output and used
for a general purpose. If used in conjunction with
the development board, this pin maps to GPIO3.
CTS/
GPIO2
DCD/
GPIO1
NA PORTC7 Reserved NA NA
PORTA1 Allocated Pin 11 on 20 pin
header
PORTA0 Allocated Pin 13 on 20 pin
header.
Used for the serial CTS signal, but could be
reassigned as either GPIO input or output and used
for a general purpose. If used in conjunction with
the development board, this pin maps to GPIO2.
Used for the serial DCD signal, but could be
reassigned as either GPIO input or output and used
for a general purpose. If used in conjunction with
the development board, this pin maps to GPIO1.
n n n n n n n 31
LEDs
Name Register
Bit
Green
LED
/INIT PORTC5 Available Pin 20 on 20 pin
NA PORTC4 -
PORTC6 Allocated Connected to the
PORTC0
Category External
Interface
green LED
header
Reserved NA NA
LEDs
General informa tion
The Digi Connect ME has two types of LEDs:
Description
Used as the Ethernet activity LED, but could be
reassigned as a general purpose LED. It must
remain a GPIO output for the LED to operate
correctly. The LED is lit wh en the signal is a logic
low.
Can be configured for either GPIO input or GPIO
output
32 n n n n n n n
! An LED connected directly to GPIO pins on the processor and controlled
directly in software
! An LED connected to other hardware components (normally the Ethernet
hardware) and not directly programmable by the operating system
The development kit, by default, correctly configures the GPIO connected to the LED
(PORTC6) as an outp u t an d t h en uses this LED to represent Ethernet activity. For more
information regarding the control of LEDs, see the Net+Works with GNU Tools BSP
Porting Guide.
Digi Connect ME Hardware Reference
About Digi Connect ME LEDs
LED Description
Yellow This is wired directly to Ethernet hardware and provides an indication of link.
Green This software programmable LED is wired to processor GPIO register bit
Reset
Hard reset
The Digi Connect ME supports a hardware reset via pin 14 of the 20-pin header. The unit is
forced into a hard reset when this pin is pulled low. When plugged into a development
board, this pin is wired to the push button at SW3. As a result, this switch acts as a hard
reset button.
Programming C onsiderations
PORTC6 and is wired to be lit when low. The default behavior is to blink on
Ethernet activity.
Soft reset
Net+OS provides an internal facility to enact a soft reset, but it is the responsibility of a
specific implementation to choose a reasonable trigger to invoke it. One choice is to use a
GPIO pin as a signal to trigger a soft reset. The Digi Connect ME has one GPIO pin named
"/INIT” (PORTC5) that is not normally assigned to any other task. It is an ideal candidate
for a soft reset. The signal is e x posed via pin 20 on the 20-pin header, so it can be
controlled by an embedded host. When plugged into the development board, the /INIT
signal is pulled high, unless a jumper is placed across pins 2 and 3 of jumper block P12. In
this way, placing the jumper s imulates pressing a soft reset button.
The naresetapp example application demonstrates a simple mechanism for monitoring a
GPIO pin and then initiating a soft reset when the pin achieves a particular value.
n n n n n n n 33
Flash
Flash
General informa tion
Logical regions with Digi Connect ME flash are assigned to particular uses. As a result, its
use for general purposes in development kit applications is limited.
In particular, the flash file system region can be used for general purposes if the BSP is not
configured to create the flash files system, and all but the first sector of the NVRAM region
can be used since the Net+OS NVRAM parameters currently (easily) fit into one sector.
See the table that follows for specific information.
Note
The Boot, POST, and Reserved sections should not be touched.
Digi Connect ME flash mappings
Region Sector Size Region Sector Size
Boot 0 - 4 128KB NVRAM 23 - 25 192KB
POST 5 - 6 128KB File system 26 - 33 512KB
Image 7 - 22 1MB Reserved 34 64KB
Memory
34 n n n n n n n
Digi Connect ME has 8 MB of SDRAM memory, which is controlled by chip select 1,
located at 0x00000000 in the processor address space and aliased at 0x04000000 and
0x08000000. The application program (EOS) is loaded at address 0x08080000.
Digi Connect ME Hardware Reference
Mechanical
! Length: 1.445 in. (36.703 mm)
! Width: 0.75 in. (19.05 mm)
! Height: 0.735 in. (18.669 mm)
! Device/serial interface connector: 20-pin micro header (10-pin double row)
Environmental
Module Specifications
APPENDIX A
with .50-inch (1.27-mm) pitch (Samtec P/N FTS-110-01-F-DV-TR or similar).
Positions 3 through 6 are removed.
! Ambient Temperature: -40
! Storage Temperature: -40
! Humidity: 5% to 90%
! Altitude: 12,000 feet (3657.60 meters)
0
F to 1850F (-400C to 850C)
0
F to 2570F (-400C to 1250C)
n n n n n n n 35
Network interface
Network interface
! RJ-45 connector (8-pin)
! 10/100BASE-T
! Half-duplex and full-duplex support
! Cable: A shielded RJ-45 cable must be used to connect the module to the
Serial interface
One TTL serial interface (CMOS 3.3v) with full modem control signals (DTR, DSR, DCD,
RTS, CTS).
network. The s hield must make contac t wi th the tabs of the R J-4 5 e nc l osure on
the module.
Data rates (bps)
50, 110, 134, 150, 200, 300, 600, 1200, 2400, 3600, 4800, 9600, 19200, 38400, 57600,
115200, 230400
Flow control options
RTS/CTS, XON/XOFF, None
36 n n n n n n n
Digi Connect ME Hardware Reference
GPIO
Five GPIO (General Purpose Input/Output) ports are selectable between modem control
and GPIO as follows:
! RTS/GPIO 4
! DTR/GPIO 5
! CTS/GPIO 2
! DCD/GPIO 1
! DSR/GPIO 3
DC characteristics
The following tables provide DC characteristic s for operating conditions, inputs, and
outputs.
Module Specifications
Symbol Description Min Typ Max Unit
V
CC
I
CC
I
IL
I
IH
I
OZ
I
OD
C
IO
Supply Voltage 3.14 3.3 3.45 V
Supply Current — 250 300 mA
Input Current as “0”
10 — 10 µA
(no pull-up)
Input Threshold
-10 — 10 µA
(no pull-up)
HighZ Leakage Current -10 — 10 µA
Output Drive Strength — — 2 mA
Pin Capacitance (VO=0)——4 pF
Operating Conditions
n n n n n n n 37
DC characteristics
Symbol Description Min Typ Max Unit
V
IH
V
IL
Input High Voltage
Input Low Voltage
2
V
-0.3
SS
—3.45V
—
0.2*V
CC
Inputs
Symbol Description Min Typ Max Unit
V
OH
V
OL
Output High Voltage 2.4 — 3.45 V
Output Low Voltage 0 — 0.4 V
Outputs
V
38 n n n n n n n
Digi Connect ME Hardware Reference
Certifications
APPENDIX B
This product complies with the following standards.
FCC Part 15 Class B
Radio frequency interference (RFI)(FCC 15.105)
The Digi Connect ME embedded module has been tested and found to comply with the
limits for Class B digital devices pursuant to Part 15 Subpart B, of the FCC Rules. These
limits are designed to provide reasonable protection against harmful interference in a
residential environment. This equipment generates, uses, and can radiate radio frequency
energy, and if not installed and used in accordance with the instruction manual, may cause
harmful interference to radio communications . However, there is no guarantee that
interference will not occur in a particular installation. If this equipment does cause harmful
interference to radio or television reception, which can be determined by turning the
equipment off and on, the user is encouraged to try and correct the interference by one or
more of the follo wing measures:
! Reorient or relocate the receiving antenna.
! Increase the separation between the equipment and the receiver.
! Connect the equipment into an outlet on a circuit different from that to which
the receiver is connected.
! Consult the dealer or an experienced radio/TV technician for help.
n n n n n n n 39
Industry Canada
Labeling requirements (FCC 15.19)
This device complies with Part 15 of FCC rules. Operation is subject to the following two
conditions: (1) this device may not cause harmful interference, and (2) this device must
accept any interference received, including interference that may cause undesired
operation.
Modifications (FCC 15.21)
Changes or modifications to this equipment not expressly approved by Digi may void the
user's authority to operate this equipment.
Industry Canada
This digital apparatus does not exceed the Class B limits for radio noise emissions from
digital apparatus set out in the Radio Interference Regulations of the Canadian Department
of Communications.
40 n n n n n n n
Le present appareil numerique n'emet pas de bru i ts ra dioelectriques depassant les limites
applicables aux appareils numeriques de la class B prescrites dans le Reglement sur le
brouillage radioelectrique edicte par le ministere des Communications du Canada."
Digi Connect ME Hardware Reference
Declaration of Conformity
(In accordance with FCC Dockets 96-208 and 95-19)
Certifications
Manufacturer's Name:
Corporate Headquarters:
Manufacturing Headquarters:
Digi International
11001 Bren Road East
Minnetonka MN 55343
10000 West 76th Street
Eden Prairie MN 55344
Digi International de cl ares, that the product:
Product Name:
Model Numbers:
Digi Connect ME embedded module
50000866-01
50000866-02
to which this declaration relates, meets the requirements specified by the Federal
Communications Commission as detailed in the following specifications:
! Part 15, Subpart B, for Class B Equipment
! FCC Docket 96-208 as it applies to Class B personal
! Computers and Peripherals
The product listed above has been tested at an External Test Laboratory certified per FCC
rules and has been found to meet the FCC, Part 15, Class B, Emission Limits.
Documentation is on file and available from the Digi International Homologation
Department.
n n n n n n n 41
International EMC standards
International EMC standards
The Digi Connect ME embedded module meets the following electromagnetic emissions
standards:
! EN55022: 1998
! EN55024: 1998
! VCCI
! AS 3548
Safety standards
The Digi Connect ME embedded module meets the following safety standards:
! UL 60950
! CSA 22.2 No. 60950
42 n n n n n n n
! EN60950
Digi Connect ME Hardware Reference
PN:(1P)
90000318 B
Loading...