EVB-20022
Industrial ARCNET
AT Adapter Card
SMSC UG - EVB-20022
Rev. 1/5/00
© 2000 STANDARD MICROSYSTEMS CORPORATION (SMSC)
80 Arkay Drive
Hauppauge, NY 11788
(631) 435-6000
FAX (631) 273-3123
Circuit diagrams utilizing SMSC products are included as a means of illustrating typical applications; consequently complete information sufficient for
construction purposes is not necessarily given. The information has been carefully checked and is believed to be entirely reliable. However, no
responsibility is assumed for inaccuracies. Furthermore, such information does not convey to the purchaser of the semiconduc tor devices described
any licenses under the patent rights of SMSC or others. SMSC reserves the right to make changes to specifications and product descriptions at any
time without notice in order to improve design and supply the best product possible. Contact your local SMSC sales office to obtain the latest
specifications before placing your product order. The product may contain design defects or errors known as anomalies which may cause the
product’s functions to deviate from published specifications. Anomaly sheets are available upon request. SMSC products are not designed, intended,
authorized or warranted for use in any life support or other application where product failure could cause or contribute to personal injury or severe
property damage. Any and all such uses without prior written approval of an Officer of SMSC and further testing and/or modification will be fully at the risk
of the customer. Copies of this document or other SMSC literature may be obtained by visiting SMSC’s website at http://www.smsc.com
SMSC UG - EVB-20022
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EVB-20022
Industrial ARCNET
AT Adapter Card
•
Based on COM20022 Rev. B Industrial Network
Controller
•
Supports both standard and backplane signaling
schemes
•
COAX and UTP support for standard ARCNET signaling
in both bus and star topologies
•
Isolated and direct RS485 interfaces
•
All media interfaces are jumper selectable
•
Data rates from 156 Kbps to 10 Mbps
•
8/16 bit, I/O mapped bus interface, I/O address is switch
selectable
•
Programmable DMA channel
•
On-board node ID switch
•
Capable of receiving all packets
•
Includes demo software
•
Sample driver, network monitor and mapping routes
APPLICATIONS:
Test equipment, network development and debug,
network management/monitoring, network evaluation,
performance analysis
SMSC UG - EVB-20022
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EVB-20022 USER GUIDE
I/O Address Selection
The EVB-20022 is a 16 bit I/O mapped card. Addresses A3-A15 are user selectable at switches S2 and S3. For
example, 02E0h would be 000000101110.
Node ID Selection
The EVB-20022 is equipped with an on-board ID switch, S1. The COM20022 network controller requires a software
programmable ID, therefore the switch does not automatically provide a node ID to the COM20022.
COM20022 ICs
The chip can be attached to the board in two different ways: it can either be socketed or it can be mounted right to the
board on U8. Only one or the other can be done, not both.
LEDs
In the front of the card, there are four LEDs. The PWR LED indicates that there is power on the board. The CPU LED
shows CPU I/O activity. The TX LED shows the data being transmitted. The DMA LED shows DMA activity.
Interrupts/DMAs
Use JP1 for interrupt selection. IRQs 3, 4, 5, 6, 7, 9, 10, 11, 12 and 15 can be selected. DACK selection is done at
JP2. DACKs 0, 1, 3, 5, 6 and 7 can be selected. DRQ selection is done at JP3. DRQs 0, 1, 3, 5, 6 and 7 can be
selected. If DMAs are being used, both the DACK and DRQ must both be set to the same value.
Media Interfaces (Transceivers)
The COM20022 supports four types of transceivers:
ARCNET Coax – operation is valid only at 2.5 Mbps and use SMSC HYC9088 hybrid
Twisted Pair line interface– operation is valid only at 2.5 Mbps
Direct coupled RS-485
Isolated RS-485
Software
For evaluation purposes SMSC provides
DEMOAT,
an MS DOS software utility which can be used to verify and
evaluate the COM20022 evaluation board. DEMOAT was developed at SMSC to both setup and verify basic
functionality of the COM20022 evaluation. The software provides a general user interface, which can be used to
change, or Read/Write register information. This software utility can also be used to both transmit and receive
ARCNET packets. When using this utility in a general network configuration, multiple ARCNET nodes must be
operational. A minimum of two ISA based PCs must be connected via the appropriate cable for correct operation.
Both machines must have the DEMOAT installed and loaded. Once the software is loaded, registers can either be
initialized at their default settings or changed to your custom requirements. At this point traffic can be produced to
send and verify ARCNET frames of data from node to node or PC to PC.
Installing DEMOAT
At the a:\ prompt type DEMOAT
Loading DEMOAT software
1.
2.
From within the Arcnet directory Type “Demoat”. When the software loads, it prompts the user for the
ARCNET evaluation board type.
Type “a”, for COM20020 to test COM20022. If a screen comes up asking if the board is a COM20020,
type “y”. The program will ask for the I/O address, type the address in that is selected by S3 and S2,
typically 2e0.
Next, the main menu will come up. When using any of the transceivers except the coax (BNC), you
need to do a setup with option A. If the coax transceiver is being used, go to step 7.
3.
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4.
At the next menu type “a”. The screen will have a list of registers and their values. Got to the config
register, one from the bottom. Change the third bit from the right (BKPLNE) from a “0” to a “1”. Exit to
the previous menu.
Select “b” from the menu. Change the register labeled IOH_1. The left most bit (P1MODE) needs to be
change from a “0” to a “1”. Exit back to the main menu.
At the main menu, select option “D” to save all of the changes that have been made to the registers.
To start the test, select “I” from the main menu, Ping-Pong. This is only to be done on one machine.
A menu will come up asking how many other nodes, and the node ID of the other nodes. Make sure the
nodes IDs are not the same. If the test is running correctly, “T” and “R” should alternate scrolling down
the screen on both machines .
5.
6.
7.
8.
Coaxial Interface
The coaxial interface uses a standard 93-ohm BNC connector, the same as a 50-ohm BNC, and requires a RG-62
type cable with 93-ohm terminations. The following guidelines for bus topology should be used for coaxial interface:
1.
2.
3.
4.
Max. distance(without repeaters).............1000’
Min. distance between nodes ...................3’
Max. number of nodes per segment........8 (i.e. no repeaters)
Max number of nodes with repeaters ......255
Operation is valid only at 2.5 Mbps and uses the SMSC HYC9088 hybrid (U15).
To setup the board for coaxial interface, with the use of SMSC DEMOAT software, perform the following steps:
1.
2.
3.
4.
5.
Note:
Note:
Install both jumpers horizontally at JP11 (Differential paired data)
Install the jumper horizontally at JP12 (Coax filter)
Set jumper blocks JP13 and JP5 both to D (Transmit data and receive data)
Set I/O board address as specified in I/O address selection in User Guide (e.g. 02E0)
Set Node ID as specified in Node ID selection in User Guide
Make sure JP6, JP8, JP9, and JP10 are left unconnected.
If socketed COM20022 (SKT1) is being utilized, U8 (alternate COM20022 device) must not be mounted on
evaluation board.
S3
S2
JP1
1
A
B
C
D
1
JP
7
U1
JP
A
B
C
D
1
LE
D
JP
1
SKT
1
JP
1
U8
U1
2
`
U1
3
T1
JP
8
JP
9
JP1
0
JP1
1
JP1
2
1
1
C
O
A
J2
1
J1
U1
5
1
S1
7
15 12 11 10 9 7 5 4 3
Figure 1
For proper coaxial operation, installed jumpers denoted in black.
SMSC UG - EVB-20022
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Rev. 1/5/00
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