Ziatech Corporation ZT 8995 Instructions for use

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ZT 8995
STD Bus Ethernet Interface
Hardware User Manual
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CONTENTS
MANUAL ORGANIZATION.....................................................................................................................4
1. INTRODUCTION .................................................................................................................................5
ABOUT THE ZT 8995 INTERFACE.............................................................................................5
PRODUCT DEFINITION.................................................................................................5
FEATURES....................................................................................................................6
FUNCTIONAL BLOCKS..............................................................................................................7
LAN INTERFACE (DP83905)..........................................................................................8
SERIAL INTERFACE (DP83905)....................................................................................8
TRANSCEIVER INTERFACE (DP8392)..........................................................................9
PACKET RAM BUFFER .................................................................................................9
USER PROM SOCKET...................................................................................................9
INTERRUPT CAPABILITY..............................................................................................9
DIAGNOSTIC LEDS.......................................................................................................9
ZT 97115 SOFTWARE DISK.......................................................................................................9
ZT 97115 PRODUCT DEFINITION...............................................................................10
2. GETTING STARTED.........................................................................................................................12
UNPACKING.............................................................................................................................12
SYSTEM REQUIREMENTS......................................................................................................12
MEMORY REQUIREMENTS........................................................................................13
PROCESSOR COMPATIBILITY................................................................................................14
DEFAULT CONFIGURATION ...................................................................................................14
SOFTWARE CONFIGURATION................................................................................................15
USING THE SETUP PROGRAM ..................................................................................15
SHARED MEMORY MODE OPERATION.....................................................................26
CONFIGURING MULTIPLE BOARDS...........................................................................29
TESTING A BOARD.....................................................................................................29
INSTALLING THE DRIVERS........................................................................................30
TROUBLESHOOTING HINTS...................................................................................................30
FURTHER INFORMATION .......................................................................................................32
3. THEORY OF OPERATION................................................................................................................33
FREQUENTLY ASKED QUESTIONS........................................................................................33
STD INTERFACE......................................................................................................................34
I/O PORT DECODE......................................................................................................35
SHARED MEMORY ADDRESSING..............................................................................35
INTERRUPTS...............................................................................................................36
WAIT STATES..............................................................................................................37
ETHERNET INTERFACE..........................................................................................................37
TWISTED-PAIR ETHERNET (10BASET) CONNECTOR ..............................................39
ETHERNET (AUI) CONNECTOR..................................................................................39
THIN ETHERNET (BNC) CONNECTOR.......................................................................40
DIAGNOSTIC LEDS..................................................................................................................40
A. JUMPER CONFIGURATIONS ..........................................................................................................41
JUMPER DESCRIPTIONS........................................................................................................43
W1 (CHASSIS GROUND TO LOGIC GROUND)...........................................................43
W2 (AT/LANTIC POWER-ON CONFIGURATION)........................................................43
W3 (ISP PAL PROGRAM ENABLE)..............................................................................44
W4-W7 (24-BIT ADDRESS SELECTION).....................................................................44
W8,9,15 (SHARED MEMORY BLOCK LOCATION)......................................................45
W10 (THIN ETHERNET ENABLE)................................................................................45
W11-W14 (INTERRUPT SIGNAL SELECTION)............................................................46
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Contents
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W15 (EARLY ALE* SIGNAL GENERATION) ................................................................46
W16 (WAITRQ* ENABLE SELECTION)........................................................................47
W17 (16-BIT DATA WIDTH SELECTION).....................................................................47
W18 (16-BIT DATA WIDTH SELECTION).....................................................................47
W19 (WAITRQ* ENABLE SELECTION)........................................................................48
B. NETWORK COMPONENTS AND CABLING ....................................................................................49
ETHERNET OPTIONS SUMMARY...........................................................................................49
THIN ETHERNET.........................................................................................................49
THICK ETHERNET.......................................................................................................50
TWISTED-PAIR ETHERNET........................................................................................50
FIBER-OPTIC USAGE..................................................................................................51
THIN ETHERNET CABLING .....................................................................................................51
THIN ETHERNET "T" CONNECTORS AND TERMINATORS.......................................51
THIN ETHERNET REPEATERS...................................................................................52
THICK ETHERNET CABLING...................................................................................................55
THICK ETHERNET "T" CONNECTORS AND TERMINATORS.....................................56
THICK ETHERNET MEDIA ATTACHMENT UNITS.......................................................56
THICK ETHERNET REPEATERS.................................................................................58
TWISTED-PAIR ETHERNET CABLING.....................................................................................58
TWISTED PAIR ETHERNET REPEATERS ..................................................................59
FIBER OPTIC CABLING ...........................................................................................................60
FIBER OPTIC MEDIA ATTACHMENT UNITS...............................................................60
FIBER OPTIC REPEATERS.........................................................................................61
C. NETWORK INTERCONNECTION.....................................................................................................62
NETWORK CHARACTERISTICS..............................................................................................64
D. SPECIFICATIONS............................................................................................................................68
ELECTRICAL AND ENVIRONMENTAL SPECIFICATIONS.......................................................68
ABSOLUTE MAXIMUM RATINGS................................................................................68
DC OPERATING CHARACTERISTICS.........................................................................68
STD LOAD CHARACTERISTICS..................................................................................68
STD-80 COMPATIBILITY .............................................................................................70
MECHANICAL SPECIFICATIONS.............................................................................................71
CARD DIMENSIONS AND WEIGHT.............................................................................71
CONNECTORS............................................................................................................72
E. CUSTOMER SUPPORT....................................................................................................................78
TECHNICAL/SALES ASSISTANCE...........................................................................................78
RELIABILITY.............................................................................................................................78
RETURNING FOR SERVICE....................................................................................................78
ZIATECH WARRANTY..............................................................................................................79
TRADEMARKS.........................................................................................................................79
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MANUAL ORGANIZATION
This manual describes the operation and use of the ZT 8995 STD Ethernet Interface
Board. Each chapter is briefly outlined below to help you find the best place to start.
Chapter 1, "Introduction," offers an overview of the ZT 8995. It includes a product
definition, a list of product features, a functional block diagram, and a brief description of
each block. The ZT 97115 software drivers, setup, and diagnostic programs are also
described. If you wish to evaluate the ZT 8995 to determine if it fits your needs, this
chapter is especially useful to you.
Chapter 2, "Getting Started," summarizes the information you need to get your
ZT 8995 up and running. Refer to the following sections for further explanation of the
material covered in "Getting Started."
Chapter 3, "Theory Of Operation," presents a detailed description of ZT 8995 system
level operation. The topics discussed in this chapter include commonly asked questions,
the STD bus interface, the Ethernet interface, and diagnostic LEDs present on the
board.
Appendix A, "Jumper Configurations," illustrates jumper options that tailor the
board's operation to your specific application.
Appendix B, "Network Components and Cabling," provides an overview of Ethernet
components and cabling, contrasting Thin Ethernet, Thick Ethernet, Twisted-Pair
Ethernet, and fiber optic cabling.
Appendix C, "Network Interconnection," describes the electrical and mechanical
requirements to interconnect an Ethernet network.
Appendix D, "Specifications," contains the electrical, mechanical, and environmental
specifications for the ZT 8995.
Appendix E, "Customer Support," includes a product revision history, technical
assistance, and the necessary information should you need to return your ZT 8995 for
repair.
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1. INTRODUCTION
This chapter introduces some key features of the ZT 8995. It includes a product
definition, a list of product features, a functional block diagram, and a description of
each block. The ZT 97115 software setup and driver package for the ZT 8995 is also
covered. Carefully review this chapter to gain a basic understanding of the capabilities
of the ZT 8995. Unpacking information, as well as installation and setup instructions, are
in Chapter 2, "Getting Started."
ABOUT THE ZT 8995 INTERFACE
The following sections include a product definition for the ZT 8995 and a list of product
features.
Product Definition
The ZT 8995 is an Ethernet Interface for the STD 32 bus and for the STD bus. It
supports 10Base-T as well as Thin Ethernet (Cheapernet, 10BASE2) and Thick
Ethernet (10BASE5) cabling options. For cable configurations, review Appendix B,
"Network Components and Cabling". Additional ZT 8995 support includes extensive
software drivers for several popular network operating systems, a setup program, and
complete diagnostics.
The ZT 8995 conforms to the IEEE 802.3 and Ethernet standards for a 10 Mbps Carrier
Sense Multiple Access/Collision Detection (CSMA/CD) local area network. Local area
networks using twisted-pair, coax, and fiber optic media can be supported. Refer to
Appendix B, "Network Components and Cabling", for more information.
The ZT 8995 comes with a ROM socket and software drivers. Check the ZT 97115
disks for a complete list of supported drivers.
Software packages are also available for TCP/IP support. Department of Defense
TCP/IP software from FTP Software allows remote log-in, file transfer, terminal
emulation, electronic mail, and many other functions. TCP/IP is widely used and is
supported by over 150 vendors, allowing dissimilar computers and operating systems to
communicate.
Boot ROM capability for Novell NetWare V2.0A, V2.1 and later is supported by National
Semiconductor's boot ROM. When the boot ROM is installed on the ZT 8995, the disk
operating system is loaded from the network server. This diskless installation is ideal for
systems in harsh industrial environments where driver installation would normally
require rotating media.
The ZT 8995 is compatible with all Ziatech STD 32 and STD systems. A versatile setup
program allows you to configure the board for the desired I/O address, packet RAM
address, PROM socket address, and interrupt selection.
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1. Introduction
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In addition to these features, the ZT 8995 incorporates low-power CMOS devices for
operation in 0º to +70º Celsius environments. CMOS devices that are TTL-compatible
ensure system compatibility with other CMOS or TTL STD bus boards.
Features
•Novell NE2000-compatible chipset
•STD 32- and STD-compatible
•Exact STD form factor (no porches or connector extensions)
•True 16-bit I/O addressing
•20- or 24-bit memory addressing
•Includes drivers for Novell's NetWare®environment
•Supports both IEEE 802.3 10BASE2 (Thin Ethernet) and 10BASE5 (Thick Ethernet),
as well as 10Base-T Ethernet interfaces, depending on the option ordered
•Dual port RAM capability
•Transmit, Receive, and activity LEDs
•EEPROM stores system configurations
•Low-power CMOS design
•+5 V only operation
•AUI support with locking DB15 connector
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1. Introduction
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FUNCTIONAL BLOCKS
A description of each functional block follows the below figure "Functional Block
Diagram."
AUI10Base-T
ZT 8995
RG58
LEDS RJ-45
Serial
EEPROM
LAN
Interface
DP83905
Frontplane
Interrupts DB-15 BNC
Trans.
Interface
8392
(Cheapernet)
PROM
Socket
Functional Block Diagram
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1. Introduction
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LAN Interface (DP83905)
The National Semiconductor DP83905 AT/LANTIC provides the interface between the
STD bus and the on-board Local Area Network (LAN) bus The DP83905 also provides
the network interface portion of the LAN bus.
The LAN Bus
The LAN bus consists of the packet RAM and Network Interface. LAN Interface
configuration values are programmed into an external EEPROM when the device is set
up. These values are automatically loaded into on-board registers when the board is
powered up.
Depending on the configuration, the DP83905, with some external help, decodes both
memory and I/O addresses when accessing the on-board PROM socket, RAM, or
Network Interface.
The Network Interface
The Network Interface provided by the DP83905 implements all Media Access Control
(MAC) layer functions for transmission and reception of Ethernet packets, in accordance
with both the IEEE 802.3 standard and pre-IEEE 802.3 standards.
It also contains an internal First In First Out (FIFO) buffer and arbitration logic to control
access to the packet RAM. The DP83905 includes:
•Support for physical, multicast, and broadcast address filtering
•Provision for three levels of loopback
•Implementation of buffer management
The DP83905 provides complete IEEE 802.3 protocol and electronics with the only
exception being the packet RAM.
Serial Interface (DP83905)
The National Semiconductor DP83905 also provides Manchester encoding, decoding,
and collision detection for the Serial Interface. The 83905 includes the following:
•10 Mbps encoding and decoding
•Loopback capability for diagnostics
•Isolation from Ethernet cable
The DP83905 interfaces the ZT 8995 to the Ethernet cable via an external Attachment
Unit Interface (AUI) drop cable, the on-board Transceiver Interface (8392), or twisted-
pair cabling.
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1. Introduction
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Transceiver Interface (DP8392)
The National Semiconductor (or equivalent) DP8392 Transceiver Interface is used as a
coaxial cable driver/receiver for Thin Ethernet (Cheapernet) applications. The Thin
Ethernet cable can be connected directly to the ZT 8995 without using an external drop
(AUI) cable because the connector is isolated from the Serial Interface (8391) by an
isolation transformers and a DC to DC converter.
Packet RAM Buffer
The packet RAM buffer is 16 Kbytes in length and can be used by either the STD bus
processor or the Network Interface Controller (DP83905). This memory may be placed
on any 8-Kbyte memory address boundary. Compatibility with any memory move
instruction to the Network Interface results in a very efficient dual-ported packet buffer.
User PROM Socket
The ZT 8995 includes a PROM socket that can accommodate 32-, 64-. 128-, or 256-
Kbyte parts where only the top 32Kbyte block is accessible. The PROM can be mapped
into any 8, 16, 32, or 64Kbyte boundary beginning at one of eight software selectable
locations between 0C000h and 0D000h. The PROM can be accessed without
interfering with Ethernet packets being sent or received. You can use the setup program
AUTOSET8.EXE to configure the PROM socket address.
Interrupt Capability
Interrupts are supported by the ZT 8995. Interrupts are software selectable for
backplane signals INTRQ*, INTRQ1*, INTRQ2* (CNTL), INTRQ3*, INTRQ4* and
NMIRQ*. Frontplane interrupts can also be selected through software control across
FP3*, FP5*, FP6* and FP7*. Since IRQx is slot specific, it is always driven out onto the
backplane.
Diagnostic LEDs
The ZT 8995 has separate transmit, receive, and diagnostic LEDs. These LEDs provide
visual indication of network activity. Transmit activity is indicated by a red LED. Receive
activity is indicated by a green LED. A green LED is used to indicate a LINK and red
LEDs are used to indicate POLARITY problems as well as COLLISIONs.
ZT 97115 SOFTWARE DISK
The ZT 97115 software disk included with each ZT 8995 is supplied under license with
National Semiconductor. A variety of software drivers, a setup programs, and extensive
diagnostic programs are included. You can use any or all of the software drivers without
any additional cost or licensing.
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1. Introduction
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ZT 97115 Product Definition
Each ZT 97115 includes:
•Software drivers for several popular network operating systems
•A setup program
•Complete diagnostics
These features are described in the following topics.
Software Drivers
The disk includes software drivers for use with several network operating systems. You
must integrate these drivers into your network operating system. A complete list of
supported software drivers is available on the ZT 97115 disk. Keep in mind that the
ZT 8995 is NE2000 compatible and can be used with most drivers that are already
provided with your network software.
Setup Program
The ZT 97115 includes a setup program to initialize the ZT 8995. The setup program is
used to initialize the following:
•Base I/O address
•Interrupt line
•Operating mode (I/O or Memory Mapped)
•Media Selection (UTP, Thin or Thick Ethernet)
The board is shipped software "disabled". This prevents a possible conflict with your
existing system I/O map and interrupt structure. To set your default values, a DOS
based configuration program called INFOSET.EXE must be used. Refer to the topic
"Using The Setup Program" in Chapter 2 for details.
Diagnostic Programs
The ZT 97115 software disk contains a diagnostic program named AUTOSET8.EXE
used to verify the correct configuration (via setup) and operation of a ZT 8995 Ethernet
board before installing the network software. Software is also included to test the
ZT 8995 and to initiate and respond to network messages while logging network
statistics. Diagnostics can be run in iterative or continuous modes initiated from within
the diagnostic itself or from the DOS command line. See below:
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1. Introduction
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AUTOSET8.EXE
This program will re-configure the ZT 8995 to your specific system requirements.
Including: the operating mode (memory or I/O mapped), the memory or I/O space,
special operating parameters such as signal timing, as well as the desired interrupt.
This program can also be used to diagnose board operation.
Note: This program should be used to configure the board for memory operation.
INFOSET.EXE can also set memory mode, but does not include the ability to configure
the memory map. If you plan to operate the ZT 8995 in shared memory mode, set it for
I/O operation first, using INFOSET.EXE, and then use AUTOSET8.EXE to tailor the
ZT 8995 configuration for your system.
DEFAULT.EXE
Writing 19h to the configuration register temporarily disables the ZT 8995 by locking out
I/O access to the Ethernet chip. DEFAULT.EXE re-enables the ZT 8995.
INSPECT.EXE
This is a DOS-based, "windows-like" program similar to AUTOSET8.EXE in that it
includes some diagnostics capabilities. However, it cannot be used to configure the
board.
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 12
2. GETTING STARTED
This chapter summarizes the information you need to get your ZT 8995 up and running.
You should read this chapter before you attempt to use the board.
Many of the topics in "Getting Started" are covered in greater detail in subsequent
chapters. You will find a number of cross references for topics containing further
information.
UNPACKING
Please check the shipping carton for damage. If the shipping carton and contents are
damaged, notify the carrier and Ziatech for an insurance settlement. Retain the shipping
carton and packing material for inspection by the carrier. Save the anti-static packing
material for storing or returning the ZT 8995.
Do not return any product to Ziatech without a Return Material Authorization (RMA)
number. The topic "Returning for Service" in Appendix E explains the procedure for
obtaining an RMA number from Ziatech.
WARNING: Like all equipment utilizing CMOS devices, the ZT 8995
must be protected from static discharge. Never remove any of the
socketed parts except at a static-free workstation.
SYSTEM REQUIREMENTS
The ZT 8995 is designed for use in an STD bus application. Therefore, the board is
mechanically and electrically compatible with the STD 32 series and STD standards.
Twisted Pair operation: the board requires +5 VDC ±5% at 350 mA maximum, 140 mA
typical.
Thin Ethernet operation: the board requires +5 VDC ±5% at 705 mA maximum,
495 mA typical.
Thick Ethernet operation: the board requires +5 VDC ±5% at 330 mA maximum and
120 mA typical.
AUI adapters: normally require +12 VDC ±5% at 220 mA maximum, 165 mA typical.
Consult the specific AUI adapter data sheet.
Ambient temperature range: must be maintained between 0º and +70º Celsius for
operation.
Relative humidity: must be less than 95% at 40º Celsius, non-condensing.
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2. Getting Started
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Refer to Appendix D, "Specifications," for additional specifications.
Vertical mounting is recommended in convective cooling systems not equipped with a
fan. However, most systems require a fan for reliable operation. Horizontal mounting is
not recommended unless forced air cooling of at least 30 cubic ft/min. is provided.
If a standard STD bus card cage is not used, refer to the figure "Board Dimensions" in
Appendix D for board dimensions. Be sure to allow enough clearance for good
convective or forced cooling.
Memory Requirements
The ZT 8995 may be assigned memory space within a range of addresses located
above the system memory (typically 640K). The ZT 8995 may require as much as
48 Kbytes of memory space for its 16 Kbyte RAM buffer and optional 64-Kbyte PROM.
The figure "PROM Base Address Map" following illustrates the various address maps
available to the PROM socket.
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2. Getting Started
 14
Memory Space Occupied by PROM Socket
16K ROM 32K ROM 64K ROM
DC000
D8000
D4000
D0000
CC000
C8000
C4000
C0000
E0000
DC000
D8000
D4000
D0000
CC000
C8000
C4000
C0000
DC000
D8000
D4000
D0000
CC000
C8000
C4000
C0000
D8000
D0000
C8000
C0000 C0000
D0000
ZT8995
8K ROM
(2)
(2)
(2)
Base
Address
(1) D8000 is the recommended base address for the optional ROM.
Other boards or functions (for example, EGA) may use this memory space.
(2) Use care when choosing memory space for C0000 to C8000.
(1)
PROM Base Address Map
PROCESSOR COMPATIBILITY
The ZT 8995 is designed for STD 32 and STD systems. It can be used with any STD
bus microprocessor that meets the STD 32 bus read and write timing specifications.
DEFAULT CONFIGURATION
For most systems, the ZT 8995 does not require jumper changes in order to operate.
However, after your initial installation, if a different I/O address or memory configuration
is needed, you might need to change the jumpers and/or run the setup program.
The Figure "Factory Default Jumper Configuration" in Appendix A shows the ZT 8995
factory default configuration. The list below shows the ZT 8995 default settings as
shipped from the factory.
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2. Getting Started
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•Software disabled (no I/O or memory locations enabled)
•Jumpered for 24-bit (not 20-bit) memory addressing
•BHE* enabled
•16-Kbyte buffer RAM
•PROM socket disabled
•Interrupts are software disabled
•16-bit data width operation enabled
•Thin-net DC/DC converter disabled
•Early ALE* signal operation enabled
•WAITRQ* enabled
•ISP PAL programming disabled
If you reconfigure the ZT 8995 jumpers, we recommend you document your
configuration on the blank layout provided in the "Customer Jumper Configuration"
figure in Appendix A. This allows you to restore the configuration easily if you change it
for any reason.
SOFTWARE CONFIGURATION
The ZT 97115 software disks are included with each ZT 8995 interface. The disks
contain programs to set up a board for a different configuration and to test a board. The
disks also include various software drivers. Program functions are described in the
following sections:
•Using the Setup Program
•Testing a Board
•Installing the Drivers
Note: When installing the ZT 8995 in Windows95 and WindowsNT systems, do not use
the "Auto Detect" feature in the "Add New Hardware" program. This may cause your
system to lock up and you may have to reboot. Instead, specify a new ethernet card and
select the "NE2000 Compatible" option.
Using The Setup Program
The setup program contains the software necessary to select the configuration options
for the ZT 8995. It may be found on the ZT 97115 diskette under the SETUP directory.
Use the INFOSET.EXE setup program after installing the ZT 8995 board in an STD-80
or STD 32 system. When the desired options are selected, the configuration for the
ZT 8995 is saved in on-board, nonvolatile memory (EEPROM).
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2. Getting Started
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If you have purchased a ZT 8995 for a Ziatech system for the first time, it will be
configured as follows:
•Software disabled
•Interrupts disabled
•PROM socket disabled
Use the setup program INFOSET to configure and enable the ZT 8995 operating
parameters. Once the board has been configured, the board's operation can be
checked using the AUTOSET8 or INSPECT programs (see the "Testing a Board" topic
in this chapter).
The setup program INFOSET may be executed from the floppy disk or copied to your
hard disk and executed there. Be sure to document any changes made using INFOSET.
You will need to configure the network software used with the ZT 8995 to match your
board's configuration.
The AUTOSET8 program displays the current setup information that is held in on-board,
non-volatile memory. It prompts you for any changes. If necessary, change the
configuration as required and save the new setup.
If the ZT 8995 is installed into the card cage and the setup programs indicate an error,
try looking for an I/O address conflict. If you have not used INFOSET to configure the
I/O address, the board may be software disabled. If you used INFOSET to change the
I/O address, the ZT 8995 I/O address may conflict with the I/O address of another
board. Resolve the I/O address conflict by temporarily removing the other board until
INFOSET or AUTOSET8 can be executed and the I/O address changed.
The INFOSET program sets the ZT 8995's initial operating mode and interrupt, but it
does not provide any diagnostics. Execute this program from the DOS command line
when you first receive the board. The command line format is listed below:
INFOSET <I/O address> <IRQ level> <Mode> <Media Selection>
Where:
<I/O address> should be 240h, 280h, 2C0h, 300h, 320h, 340h or 360h
<IRQ level> should be 3, 4, 5, 9, 10, 11, 12 or 15
<Mode> should be I/O or MEM
<Media Selection> should be UTP, THIN or THICK
Examples:
To set the ZT 8995-D1 board to a base I/O address of 300h, using interrupt level IR9
the command line is:
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2. Getting Started
 17
INFOSET 300 9 I/O UTP
To set the ZT 8995-D2 board to a base I/O address of 280h, using interrupt level IR5,
and thin Ethernet (connector J4) the command line is:
INFOSET 280 5 I/O THIN
If you plan to use the AUI connector (J3) the command variable "THICK" replaces
"THIN" in the command line. See also the jumper description for W10.
Interrupt Scheme
The ZT 8995 supports the selection of one of four backplane interrupts and three
frontplane interrupts via software control.
The on-board DP83905 (AT/LANTIC controller chip) must be programmed to use the
encoded mode interrupt scheme. To do this, set the INTMODE bit in Configuration
Register C HIGH (logic 1). The values in bits 3-5 of Configuration Register A select the
desired interrupt.
Note: The INFOSET or AUTOSET8 programs set the proper bits in this register for you
when you select your interrupt level.
The ZT 8995 uses an encoded interrupt scheme. A decoder maps the AT/LANTIC's
interrupt to one of the STD 32 interrupts, as shown in the "Interrupt Selection" table.
This interrupt scheme is Novell NE2000 plus compatible. The INT3 pin from the
AT/LANTIC strobes true when an interrupt is generated by the AT/LANTIC' s internal
circuitry. The selected interrupt is output from the decoder (strobed LOW) for the
duration of the INT3 strobe.
This means that the interrupt outputs are intended for use in an edge-triggered interrupt
environment. They do not function correctly in a machine with level-triggered interrupts;
interrupts may be missed.
By definition, the STD 32 bus uses edge-triggered interrupts; however, interrupts can be
system selected to be either edge or level triggered.
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2. Getting Started
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Interrupt Selection
Configuration Register A Backplane Interrupt
Bit 5
INT2 Bit 4 INT1 Bit 3 INT0 Signal Level
0 0 0 INTRQ1* IR3
0 0 1 INTRQ2* IR4
0 1 0 INTRQ4* IR5
0 1 1 INTRQ* IR9
100FP3* IR10
101FP5* IR11
110FP7* IR12
1 1 1 JPR SLCT IR15
Status LEDs
Five LEDs are located at the top of the board to indicate network status. The LEDs from
left to right are: POLARITY (POL), COLLISION (COL), TRANSMIT (XMT), LINK (LNK)
and RECEIVE (REC).
•The POL LED is lit when the TPI module detects seven consecutive link pulses or
three consecutive receive packets with reversed polarity.
•The COL LED is lit for approximately 50 ms whenever a collision is detected.
•The XMT LED is lit for approximately 50 ms whenever the on-board AT/LANTIC
controller transmits data.
•In TPI mode, the LNK LED is lit while link pulses are being received. This indicates
that the twisted-pair connection is active.
•The REC LED is lit for approximately 50 ms whenever received data is detected.
Configuration Options
Please refer to National Semiconductor's Local Area Networks data book for detailed
information on the DP83905 AT/LANTIC hardware for a more detailed explanation of
this section.
The ZT 8995 does not require many jumpers because most of the configuration options
for the board can be programmed by software. The serial EEPROM can also be written
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2. Getting Started
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to by the on-board AT/LANTIC, allowing the configuration to be changed and saved.
The memory map of the EEPROM is shown in the "EEPROM Contents" table.
The fields in the EEPROM are defined as:
Configuration Register A - Stores the base I/O Address and Interrupt number that the
board is currently using. The AT/LANTIC has write access to this location. See the
"Configuration Register A" bit description below.
Configuration Register B - Stores the Physical Layer Interface and programmable bus
options. The AT/LANTIC has write access to this location. Refer to the
"Configuration Register B" bit description below.
Configuration Register C - Stores the Boot PROM address and other hardware-
specific configuration options. The AT/LANTIC cannot write to this location. See the
"Configuration Register C" bit description below.
42h - This location (08h) must contain 42h (ASCII 'B'). When W17 is installed (low), the
software will read this location in the PROM Store register of the AT/LANTIC and
determine that the board is in an 8-bit STD slot. The AT/LANTIC cannot write to this
location.
57h - This location (07h) must contain 57h (ASCII 'W'). When W17 is removed (high),
the software will read this location in the PROM Store register of the AT/LANTIC and
determine that the board is in a 16-bit STD 32 slot. The AT/LANTIC cannot write to this
location.
CHECKSUM - This location is used only in Shared RAM mode. The checksum is used
to verify the Ethernet Address and the board type. The two's compliment addition of the
last eight bytes (03h..00h) must equal FFh, otherwise there is an error. The value of the
checksum is determined from this. The AT/LANTIC cannot write to this location.
BOARD TYPE - This location is used only in Shared RAM mode. The Board Type
indicator tells the network driver what hardware is being used. The AT/LANTIC cannot
write to this location. When the board is configured to operate in WD8003EBT
compatible Shared RAM mode, the Board Type should be 05h.
ETHERNET ADDRESS - The last six bytes of the EEPROM contain the Ethernet
Address issued by the IEEE. These bytes are programmed uniquely prior to fitting the
device onto the board because the AT/LANTIC is unable to write to these locations.
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