Excalibur M4K708 User manual

Artisan Technology Group is your source for quality
new and certied-used/pre-owned equipment
• FAST SHIPPING AND
DELIVERY
• TENS OF THOUSANDS OF
IN-STOCK ITEMS
• EQUIPMENT DEMOS
• HUNDREDS OF
MANUFACTURERS
SUPPORTED
• LEASING/MONTHLY
RENTALS
• ITAR CERTIFIED
SECURE ASSET SOLUTIONS
SERVICE CENTER REPAIRS
Experienced engineers and technicians on staff
at our full-service, in-house repair center
WE BUY USED EQUIPMENT
Sell your excess, underutilized, and idle used equipment
We also offer credit for buy-backs and trade-ins
www.artisantg.com/WeBuyEquipment
REMOTE INSPECTION
Remotely inspect equipment before purchasing with
our interactive website at www.instraview.com
LOOKING FOR MORE INFORMATION?
Visit us on the web at www.artisantg.com for more
information on price quotations, drivers, technical
specications, manuals, and documentation
Contact us: (888) 88-SOURCE | [e-mail] | www.artisantg.com
SM
View
Instra

311 Meacham Ave ♦ Elmont ♦ NY 11003 ♦ tel. [phone] ♦ fax [phone]
e:mail: [e-mail] website: www.mil-1553.com
M4K708
ARINC 708/453
Test and Simulation Module for the
EXC-4000 Family of Carrier Boards
User’s Manual
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

Table of Contents
M4K708 Module: User’s Manual page i
Table of Contents
1 Introduction
1.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
1.1.1 M4K708 Module Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
1.1.2 M4K708 Module Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
1.2 Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
1.2.1 Module Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
1.2.2 Adding Software Tools Drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
1.3 M4K708 General Memory Map. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
2 Channel Operation
2.1 Channel Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
2.1.1 Channel Receive Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
2.1.2 Channel Transmit Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
2.2 Global Control Registers and Memory Map . . . . . . . . . . . . . . . . . . . 2-4
2.3 Channel Control Registers and Memory Map . . . . . . . . . . . . . . . . . 2-7
3 Mechanical and Electrical Specifications
3.1 Module Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
3.2 LED Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
3.2.1 Factory DIP Switch Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
3.3 Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
3.3.1 EXC-4000 Carrier Board 96-pin Connector. . . . . . . . . . . . . . . . . . . . . 3-3
3.3.2 M4K708 Module Adapter Cable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
3.4 Power Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
4 Ordering Information
Appendix A ARINC 708 Display Data Bus Word Format
Appendix A-1 ARINC 708 Word Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
Appendix A-2 ARINC 708 Word Bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

Table of Contents
page ii Excalibur Systems
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

Chapter 1 Introduction
M4K708 Module: User’s Manual page 1 - 1
1 Introduction
Chapter 1 provides an overview of the M4K708 avionics communication module.
the following topics are covered:
1.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-1
1.1.1 M4K708 Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2
1.1.2 M4K708 Module Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2
1.2 Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-3
1.2.1 Module Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-3
1.2.2 Adding Software Tools Drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-3
1.3 M4K708 General Memory Map. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
1.1 Overview
The M4K708 is an interface module for the multimode, multiprotocol Excalibur
EXC-4000 family of carrier boards. The module is an ARINC 708/453 2-channel
test and simulation module for the Weather Radar Display Databus. The M4K708
supports two ARINC 708/453 channels, each selectable as transmit or receive.
Each channel implements an 64K×16 FIFO and supports polling and/or interrupt
driven operation.
The M4K708 comes complete with Windows software, a C-driver software library
including source code. In addition, Excalibur produces adapter cables that convert
the carrier board I/O Molex™ connector to two twinax Trompeter CJ70 connectors
(or equivalent). The cable may be purchased at an additional cost.
The M4K708-E option is an extended temperature (-40º to +85ºC), ruggedized
version of the module for industrial or harsh environmental conditions.
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

Chapter 1 Introduction
M4K708 Module: User’s Manual page 1 - 2
1.1.1 M4K708 Module Features
See Chapter 4 Ordering Information, for exact part numbers.
1.1.2 M4K708 Module Block Diagram
Figure 1-1 M4K708 Module Block Diagram
General Features
Supports 2 ARINC-708/453 channels, each
programmable as transmit or receive
64K × 16 FIFO per channel holds up to 655 1600-
bit words
Optional bus termination
Interrupt and polling modes of operation
Loopback test capability
Receive Channel Transmit Channel
Receive features:
Word status tagging
Word time tagging (32-bit)
Receive count interval trigger
Transmission modes:
One-shot [one 1600-bit word at a time]
Continuous [as long as FIFO not empty]
Continuous FIFO retransmit
Receive counter [indicates number of words
received]
Programmable inter word gap time
[0–6.5 sec @ 100μsec resolution]
Polling conditions:
FIFO full
FIFO half full
FIFO empty
‘n’ Words received
Polling conditions:
FIFO full
FIFO half full
FIFO empty
‘n’ Words transmitted
Interrupt conditions:
FIFO full
‘n’ Words received
Interrupt conditions:
FIFO empty
‘n’ Words transmitted
Physical Characteristics
Dimensions: 67mm × 48mm
Weight: 20g
Host Interface
EXC-4000 series of carrier boards
Power:+5V @ 600mA both channels
transmitting @ 50% duty cycle
Operating Environment
Temperature: 0° to 70°C standard temperature
-40° to +85°C extended temperature
[optional]
Humidity: 5%–90% condensing
Software Support
C drivers with source code
M4K
Local
Bus
Local Bus
Interface
&
Channel’s
Logic
FPGA
Ch#0
Bus
Ch#1
Bus
Ch#1
Front
End
Ch#1
Tx/Rx
64Kx16 FIFO
Ch#0
Tx/Rx
64Kx16 FIFO
Addr/Data/Ctrl
Ch#0
Front
End
Config
DIP Sw
40MHz
Osc
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

Chapter 1 Introduction
M4K708 Module: User’s Manual page 1 - 3
1.2 Installation
To operate the M4K708 module:
1. Install the EXC-4000 carrier board with the module in the computer.
2. Add Software Tools drivers to the hard disk.
1.2.1 Module Installation
Warning: Wear a suitably grounded, electrostatic discharge wrist strap
whenever handling the M4K708 module and use all antistatic
precautionary measures.
1. If the module is supplied separately from the carrier board, very carefully,
insert the module on to the desired module location on the carrier EXC-4000
board. The pin #1 marker (marked with a white rectangle) on the module
must be aligned with the white rectangles on the carrier board.
2. With the computer power source switched off,insert the EXC-4000 carrier
board with the M4K708 module into a slot in the computer.
3. Attach the 708 adapter cable to the carrier board I/O connector and to the
bus.
For more information about installing the module, see Chapter 3 Mechanical and
Electrical Specifications.
1.2.2 Adding Software Tools Drivers
The standard software included with the M4K708 module is for Windows
operating systems. Software compatible with other operating systems is available
and can be downloaded from our website: www.mil-1553.com.
For information about installing the accompanying software drivers, see the
Readme.pdf file for the M4K708 module on the Excalibur Installation CD that came
with your module.
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

Chapter 1 Introduction
page 1 - 4 Excalibur Systems
1.3 M4K708 General Memory Map
The M4K708 memory map is divided into four regions – three memory regions
and one reserved region:
Region 1 [1 Kbytes] is the Channel #0 memory space;
Region 2 [1 Kbytes] is the Channel #1 memory space;
Region 3 [1 Kbytes] is the Global memory space;
Region 4 – reserved
Figure 1-2 M4K708 General memory Map
For a description of the channel receive and transmit operation as well as Global
and Channel Control registers see Chapter 2. Chapter 3 includes details of the
Mechanical and Electrical Specifications of the M4K708 Module.
Region 1
1 Kbyte Channel #0 Memory Space 00000 – 003FF H
Region 2
1 Kbyte Channel #1 Memory Space 00400 – 007FF H
Region 3
1 Kbytes Global Memory Space 00800 – 00AFF H
Region 4
125 Kbytes Reserved 00B00 – 1FFFF H
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

Chapter 2 Channel Operation
M4K708 Module: User’s Manual page 2 - 1
2 Channel Operation
Chapter 2 describes M4K708 module operation.
2.1 Channel Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2
2.1.1 Channel Receive Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2
2.1.2 Channel Transmit Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-3
2.2 Global Control Registers and Memory Map. . . . . . . . . . . . . . . . . . . .2-4
2.2.1 Global Hardware Revision Register . . . . . . . . . . . . . . . . . . . . . .2-4
2.2.2 Global Software Reset Register . . . . . . . . . . . . . . . . . . . . . . . . .2-5
2.2.3 Global Configuration Register . . . . . . . . . . . . . . . . . . . . . . . . . . .2-5
2.2.4 Global Start Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-5
2.2.5 Global Interrupt Status Register . . . . . . . . . . . . . . . . . . . . . . . . .2-6
2.2.6 Global Time Tag Reset Register . . . . . . . . . . . . . . . . . . . . . . . . .2-6
2.2.7 Global Time Tag Counter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-6
2.3 Channel Control Registers and Memory Map . . . . . . . . . . . . . . . . . .2-7
2.3.1 Channel Software Reset Register . . . . . . . . . . . . . . . . . . . . . . . .2-7
2.3.2 Channel Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-8
2.3.3 Channel Start/Stop Register . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-8
2.3.4 Channel Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-9
2.3.5 Channel Interrupt Mask Register. . . . . . . . . . . . . . . . . . . . . . . . .2-9
2.3.6 Channel Interrupt Status Register . . . . . . . . . . . . . . . . . . . . . . .2-10
2.3.7 Channel Interrupt Clear Register. . . . . . . . . . . . . . . . . . . . . . . .2-10
2.3.8 Channel Event Frequency Register. . . . . . . . . . . . . . . . . . . . . .2-11
2.3.9 Channel FIFO Counter Register . . . . . . . . . . . . . . . . . . . . . . . .2-11
2.3.10 Channel Output Trigger Mask Register . . . . . . . . . . . . . . . . . . .2-11
2.3.11 Receive FIFO Read Register . . . . . . . . . . . . . . . . . . . . . . . . . .2-13
2.3.12 Receive FIFO Word Type Register . . . . . . . . . . . . . . . . . . . . . .2-14
2.3.13 Receive FIFO Word Count Register . . . . . . . . . . . . . . . . . . . . .2-14
2.3.14 Transmit FIFO Data / First / Last Write Register . . . . . . . . . . . .2-14
2.3.15 Transmit Interval Value Register . . . . . . . . . . . . . . . . . . . . . . . .2-15
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

Chapter 2 Channel Operation
page 2 - 2 Excalibur Systems
2.1 Channel Operation
Each channel’s mode of operation, either transmit or receive, is selected through
bits in the Global Configuration Register. Selecting the mode sets also the direction of
the channel’s FIFO. Within the channel’s Memory space there are three groups of
registers:
• The first group is common to transmit and receive modes
• The second group is dedicated to receive mode only
• The third group of registers is dedicated to transmit mode only
Each channel provides interrupts/triggers or polling bits on two occasions. The first
occasion (Word Over) is set by the Channel Event Frequency Register with the number of
708 Words received/sent between the occasions. The second occasion (FIFO Over)
indicates a FIFO overrun/underrun Error condition. In addition the channels can be
set up in an Internal loopback configuration. This crosswire connection allows the
user to perform a full module’s internal self test by transmitting, receiving and
comparing in both directions, including interrupts and all other registers
functionality.
2.1.1 Channel Receive Operation
In receive mode, after start is activated, each 708 Word is stored in the FIFO as a
block of 103 16-bit words (see Figure 2-3 Received 708 Word Block Structure, on page 2-12).
The first two words in the FIFO block are Time_Tag_Lo (first) and Time_Tag_Hi,
indicating the word time stamp, then follow the 100 words comprising the 1600-bits
of the 708 Word, and finally comes the Status Word, indicating the word status
(valid or not). During the storing process, the Channel FIFO Counter is
incremented each write to the FIFO. The Receive FIFO Word Count Register is
incremented by 1 at the end of receiving the 708 Word. The next received 103 word
block is pushed into the FIFO immediately after it. The user can read the FIFO in
conjunction with interrupts or polling bits or counters value or Channel Status Register
bits (FIFO not empty or half full). Each 16-bit word read from the FIFO can be
evaluated by reading the Receive FIFO Word Type Register immediately after it in order
to follow the block structure.
Note: The first bit received from the 708 bus is located at the least significant bit
(LSB) of the first data word read from the fifo. In the same way each
following 16 bits are shifted in (shift right).
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

Chapter 2 Channel Operation
M4K708 Module: User’s Manual page 2 - 3
2.1.2 Channel Transmit Operation
In transmit operation the data words are loaded by the user into the FIFO and once
start is activated, are transmitted in the run mode selected by the Channel Control
Register bits. Transmission stops as soon as the FIFO reaches an empty condition.
There are three run modes: One-shot, Continuous and Continuous FIFO
Retransmit.
In the continuous modes the 708 Words are sent in time intervals set by the Transmit
Interval Value Register. The user can write to the FIFO in conjunction with interrupts
or polling bits or Channel FIFO Counter Register value or Channel Status Register bits (FIFO
not full or half full or channel in transmit).
Each 708 Word written into the FIFO is a block of 100 16-bit words, which are
loaded by the user through three registers. The first word is written to the Transmit
FIFO First Write Register, the next 98 words are written to the Transmit FIFO Data Register
and the last word is written to the Transmit FIFO Last Write Register. The reason for
using three registers is to indicate to the hardware the beginning and end of the
block. See Figure 2-2 Channel Memory Maps, on page 2-7and Transmit FIFO Data / First / Last
Write Register, page 2-13.
Note: The least significant bit (LSB) of the first data word written to the FIFO is
the first bit transmitted over the 708 bus. In the same way each following 16
bits are shifted out (shift right).
Run Mode Description
One Shot Transmits one 708 Word and then clears the Start/Stop bit
Continuous Transmits 708 Words continuously as long as the fifo is not empty
Continuous FIFO
Retransmit
The FIFO is preloaded with a set of 708 Words and after start is activated, this
set of words is retransmitted continuously
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

Chapter 2 Channel Operation
page 2 - 4 Excalibur Systems
2.2 Global Control Registers and Memory Map
The global memory block contains all the module global functions.
Read The Global Hardware Revision register indicates the hardware FPGA revision level.
Global Hardware Revision 00800 H
Global Software Reset 00802 H
Global Configuration 00804 H
Global Start 00806 H
Global Interrupt Status 00808 H
Global Time Tag Reset 0080AH
Global Time Tag Counter 0080C – 0080E H
Spare 00810 H
Reserved [Factory test] 00812 H
Reserved 00814 – 1FFFF H
Figure 2-1 Global Registers Memory Map
2.2.1 Global Hardware Revision Register Address: 00800 (H)
Bit Bit Name Description
04-15 Module ID Hard coded to value 708 H
00-03 FPGA Rev. 1 = Rev 1
2 = Rev 2
3 = Rev 3
Global Hardware Revision Register
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

Chapter 2 Channel Operation
M4K708 Module: User’s Manual page 2 - 5
Write Writing any value to the Global Software Reset register resets the whole module.
Write/
Read
The Global Configuration register is used to set the channel configuration and
select the self-test configuration.
The internal loopback configuration connects the channel’s digital internal input/
output signals. This mode can be used to check the whole channel’s logic by
transmitting /receiving test words in both directions. No data is transmitted over
the 708/453 bus in this mode.
This register is initialized to 0000 (H) at reset.
Write Writing any value to the Global Start register will start both channels running
simultaneously once both channels are fully setup.
To start the channels individually, see section 2.3.3 Channel Start/Stop Register, page 2-8.
2.2.2 Global Software Reset Register Address: 00802 (H)
2.2.3 Global Configuration Register Address: 00804 (H)
Bit Bit Name Description
04-15 Reserved Set to 0
03 ST3 Reserved
02 ST Self-test configuration
0 = No self-test
1 = Internal loopback configuration
01 CG1 Channel 1 Configuration set
0 = Receive
1 = Transmit
00 CG0 Channel 0 Configuration set
0 = Receive
1 = Transmit
Global Configuration Register
2.2.4 Global Start Register Address: 00806 (H)
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

Chapter 2 Channel Operation
page 2 - 6 Excalibur Systems
Read The Global Interrupt register indicates the channel’s interrupt status. The Channel
Interrupt Clear Register resets the status bits.
Write Writing any value to the Global Time Tag Reset register reset’s the module’s Time
Tag Counter.
Read The two Global Time Tag Counter words represent the current value of the free-
running 32-bit Time Tag counter. The counter may be read at any time. Keep the
following read sequence:
The resolution of the counter is 10 μsec. The counter is reset to 0 upon power-up or
software reset or through the Global Time Tag Reset Register. After the reset operation,
the counter starts counting. When the counter reaches the value FFFF FFFF (H), it
wraps around to 0 and continues counting.
2.2.5 Global Interrupt Status Register Address: 00808 (H)
Bit Bit Name Description
02-15 Reserved Set to 0
01 IS1 Channel 1 Interrupt Status
0 = Bit not active
1 = Interrupt active
00 IS0 Channel 0 Interrupt Status
0 = Bit not active
1 = Interrupt active
Channel Interrupt Status Register
2.2.6 Global Time Tag Reset Register Address: 0080A (H)
2.2.7 Global Time Tag Counter Address: 0080C (H)
0080E (H)
FIRST: 0080C H (Lo Word - LSB)
LAST: 0080E H (Hi Word - MSB)
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

Chapter 2 Channel Operation
M4K708 Module: User’s Manual page 2 - 7
2.3 Channel Control Registers and Memory Map
The Channel Control Registers must be set for each channel separately.
Write Writing any value to the Channel Software Reset register resets the whole channel.
Register Channel #0 Channel #1
Channel Software Reset [W] 00000 H 00400 H
Channel Control [W/R] 00002 H 00402 H
Channel Start/Stop [W/R] 00004 H 00404 H
Channel Status [R] 00006 H 00406 H
Channel Interrupt Mask [W/R] 00008 H 00408 H
Channel Interrupt Status [R] 0000A H 0040A H
Channel Interrupt Clear [W] 0000C H 0040C H
Channel Event Frequency [W/R] 0000E H 0040E H
Channel FIFO Counter [R] 00010 H 00410 H
Channel Output Triggers Mask [W/R] 00012 H 00412 H
Reserved 00014 – 00001E H 00414 – 0041E H
Receive FIFO Read [R] 00020 H 00420 H
Receive FIFO Word Type [R] 00022 H 00422 H
Receive FIFO Word Count [R] 00024 H 00424 H
Receive Spare 00026 H 00426 H
Reserved 00028 – 0003E H 00428 – 0043E H
Transmit FIFO Data Write [W] 00040 H 00440 H
Transmit FIFO First Write [W] 00042 H 00442 H
Transmit FIFO Last Write [W] 00044 H 00444 H
Reserved 00046 –00048 H 00446 – 00448 H
Transmit Interval Value [W/R] 0004A H 0044A H
Reserved 0004C – 003FE H 0044C – 007FE H
Figure 2-2 Channel Memory Maps
2.3.1 Channel Software Reset Register Address: xx000 (H)
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

Chapter 2 Channel Operation
page 2 - 8 Excalibur Systems
Write/
Read
The Channel Control register sets the parameters for the Channel Receive and
Transmit modes.
This register is initialized to 0000 (H) at reset.
Write/
Read
Writing to the Channel Start/Stop Register starts or stops the channel running.
This register is initialized to 0000 (H) at reset.
2.3.2 Channel Control Register Address: xx002 (H)
Bit Bit Name Description
02–15 Reserved Set to 0
00-01 RNM Tx Run Mode
00 = One-shot mode (single word)
01 = Continuous mode (as long as Tx FIFO not empty)
10 = Continuous FIFO retransmit mode
11 = Reserved
Channel Control Register
2.3.3 Channel Start/Stop Register Address: xx004 (H)
Bit Bit Name Description
01–15 Reserved Set to 0
00 STR Start/Stop
0 = Stop channel transmission/reception at the end of
current word processing
1 = Start the channel transmission/reception
In transmit one-shot mode this bit is automatically
cleared
Channel Start/Stop Register
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

Chapter 2 Channel Operation
M4K708 Module: User’s Manual page 2 - 9
Read The Channel Status register provides various channel status bits and is initialized
to 0001 (H) at reset
.
Write/
Read
Setting a bit of the Channel Interrupt Mask register enables the corresponding
channel interrupt.
Initialized to 0000 (H) at reset.
2.3.4 Channel Status Register Address: xx006 (H)
Bit Bit Name Description
05–15 Reserved Set to 0
04 HCB Channel FIFO Counter bit 16 [see Channel FIFO
Counter Register, page 2-11]
03 ITX Channel in Transmit (Tx mode)
0 = Channel not transmitting
1 = Channel is in Transmit state
02 FUL Channel FIFO full (Tx mode)
0 = Bit not active
1 = FIFO full (65536 16-bit Words)
01 HFL Channel FIFO half full (Tx and Rx mode)
0 = Bit not active
1 = FIFO half full (more than 32768 16-bit Words)
00 EMT Channel FIFO empty (Rx mode)
0 = Bit not active
1 = FIFO empty (0 Words)
Channel Status Register
2.3.5 Channel Interrupt Mask Register Address: xx008 (H)
Bit Bit Name Description
02–15 Reserved Set to 0
01 WOM Word Over Mask
0 = Disable WOV bit interrupt
1 = Enable WOV bit interrupt
00 FOM FIFO Over Mask
0 = Disable FOV bit interrupt
1 = Enable FOV bit interrupt
Channel Interrupt Mask Register
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

Chapter 2 Channel Operation
page 2 - 10 Excalibur Systems
Read Each bit in the Channel Interrupt Status register indicates the corresponding
interrupt status. These bits will be set regardless of the state of the Channel
Interrupt Mask register bits.
Initialized to 0000 (H) at reset.
Note: After receipt of an interrupt, the user must reset the interrupt condition bit
via the Channel Interrupt Clear Register
Write Writing to the Channel Interrupt Clear Register clears the corresponding Channel
Interrupt Status register bit.
.
2.3.6 Channel Interrupt Status Register Address: xx00A (H)
Bit Bit Name Description
02–15 Reserved Set to 0
01 WOV Word Over [Tx/Rx Interrupt]
0 = Bit not active
1 = Number of 708 Words, set in the Channel
Event Frequency Register, were
transmitted/received.
00 FOV FIFO Over [Error Interrupt]
0 = Bit not active
1 = All Words in channel were transmitted and the
FIFO is empty (in Continuous mode) in Tx
mode or the FIFO reached full state in Rx
mode.
Channel Interrupt Status Register
2.3.7 Channel Interrupt Clear Register Address: xx00C (H)
Bit Bit Name Description
02–15 Reserved Set to 0
01 WOC Word Over Clear
0 = Bit not active
1 = Clear WOV bit interrupt
00 FOC FIFO Over Clear
0 = Bit not active
1 = Clear FOV bit interrupt
Channel Interrupt Clear Register
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

Chapter 2 Channel Operation
M4K708 Module: User’s Manual page 2 - 11
Write/
Read
The user sets the Channel Event Frequency Register to the number of ARINC 708
Words to be sent/received between interrupts/triggers.
Read The user reads the Channel FIFO Counter register in order to know the exact
quantity of words currently residing within the channel’s FIFO. Each write to the
FIFO the counter is incremented by 1 and each read it is decremented by 1. The
counter is initialized to 0000(H) at reset. While in Continuous FIFO Retransmit
mode the counter holds a fixed value with the number of words written to the FIFO
before start.
Write/
Read
Setting a bit of the Channel Output Trigger Mask register enables the
corresponding trigger condition to send a pulse over the OUTRIGn output pin (see
3.3.1.1 Module Terminal Stick Pin Assignments And Description on page 3-4).
The register is initialized to 0000(H) at reset.
See Channel Interrupt Status Register, page 2-10.
2.3.8 Channel Event Frequency Register Address: xx00E (H)
Bit Bit Name Description
10-15 Reserved Set to 0
00-09 Intrpt_Intrvl Number of 708 Words to be sent/received between interrupts.
Transmit: maximum value = 655
Receive: maximum value = 636
Minimum value = 1
Set to ‘1’ upon power-up or reset
Channel Event Frequency Register
2.3.9 Channel FIFO Counter Register Address: xx010 (H)
Bit Bit Name Description
00-15 FIFO_Cntr Number of words residing within the FIFO. Bit 16 of
this counter resides at bit 04 within the Channel
Status register. It is active for one value only when
the FIFO is full to represent 65536 [10000 H].
Channel FIFO Counter
2.3.10 Channel Output Trigger Mask Register Address: xx012 (H)
Bit Bit Name Description
02-15 Reserved
01 TWOM Trigger Word Over Mask
0 = Disable WOV bit condition
1 = Enable WOV bit condition
00 TFOM Trigger FIFO Over Mask
0 = Disable FOV bit condition
1 = Enable FOV bit condition
Channel Output Trigger Mask
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com