PCI-1750 32-channel Isolated Digital I/O Card User's Manual

PCI-1750
32-channel Isolated
Digital I/O Card
User's Manual
Copyright
This documentation and the software included with this product are
copyrighted 1998 by Advantech Co., Ltd. All rights are reserved.
Advantech Co., Ltd. reserves the right to make improvements in the
products described in this manual at any time without notice.
No part of this manual may be reproduced, copied, translated or
transmitted in any form or by any means without the prior written
permission of Advantech Co., Ltd. Information provided in this
manual is intended to be accurate and reliable. However, Advantech
Co., Ltd. assumes no responsibility for its use, nor for any infringements of the rights of third parties which may result from its use.
Acknowledgments
PC-LabCard is a trademark of Advantech Co., Ltd. IBM and PC are
trademarks of International Business Machines Corporation. MSDOS, Windows, Microsoft C and Quick BASIC are trademarks of
Microsoft Corporation. BASIC is a trademark of Dartmouth College.
Intel is a trademark of Intel Corporation. TURBO C is a trademark of
Borland International.
CE notification
The PCI-1750, developed by ADVANTECH CO., LTD., has passed
the CE test for environmental specifications when shielded cables are
used for external wiring. We recommend the use of shielded cables.
This kind of cable is available from Advantech. Please contact your
local supplier for ordering information.
Printed in Taiwan
Part No. 2003175000
August 1998
1st Edition
Contents
Chapter 1: General Information .......................... 1
Introduction ..................................................................... 2
Chapter 2: Installation ......................................... 5
Initial Inspection ............................................................... 6
Unpacking ........................................................................ 6
Location of Connectors ..................................................... 7
PCI-1750 Block Diagram ................................................... 8
Connector Pin Assignments ............................................... 9
Installation Instructions ................................................... 10
Chapter 3: Operation .......................................... 11
Operation ........................................................................ 12
Isolated Digital I/O Ports .................................................. 12
Timer and Counter .......................................................... 14
Interrupt Function ........................................................... 16
Appendix A: Function of 8254 Counter Chip ...... 19
Appendix B: Register Format of PCI-1750 .......... 27
CHAPTER
General
1
Information
Chapter 1 General Information
1
Introduction
The PCI-1750 offers 16 isolated digital input channels, 16 isolated
digital output channels, one isolated counter and one timer with PCI
bus interface. With isolation protection of 2500 VD C the PCI-1750 is
ideal for industrial applications where high-voltage protection is
required.
The card's 16 bits are divided into two 8-bit I/O ports. This makes the
PCI-1750 very easy to program. This card also offers dual interrupt
handling capability, providing the user more flexibility in using the
counter, timer, digital inputs or a combination to generate interrupts to
the PC. A user can easily configure the interrupts through software.
The PCI-1750 uses a PCI controller to interface the card to the PCI
bus. The controller fully implements the PCI bus specification Rev
2.1. All bus relative configurations, such as base addresses and
interrupt assignments, are automatically controlled by software. No
jumpers or DIP switches are required for user configuration .
Numbering Convention
All numbers given in this manual are in decimal format unless
specifically noted otherwise. In particular, where a register address is
given as (Base + 32), the decimal number "32" should be added to the
base value.
Features
• 16 isolated digital input and 16 isolated digital output channels.
• High voltage isolation on all channels (2500 VD C)
• High sink current on isolated output channels (200 mA/Channel).
• D-type 37-pin female connector.
• Supports dry contact or 5 to 48 VD C isolated input.
2
PCI-1750 User's Manual
• Dual interrupt handling capability
• Timer / Counter interrupt capability generates watchdog timer
interrupts
Applications
• Digital I/O control.
• Industrial ON/OFF control.
• Industrial and lab automation.
• Switch status sensing
• BCD interfacing.
Specifications
16 Optically-Isolated Inputs:
• Input range : 5 to 48 VD C or dry contact.
• Isolation voltage : 2,500 VD C
• Throughput : 10 KHz
16 Optically-Isolated Outputs:
• Output range : Open collector 5 to 40 VD C
• Sink Current : 200 mA Max.
• Isolation voltage : 2,500 VD C
• Throughput : 10 KHz
One 16-bit Optically-Isolated Counter:
• Shares Pin with isolated input 15.
• Throughput : 1 MHz Max.
• Isolation voltage : 2,500 VD C
One 32-bit Timer.
• 10 MHz internal clock source
Chapter 1 General Information
3
Interrupt Source
• Isolated Input 0, 4, 8, 12, Counter and Timer.
Dimensions: 175 mm x 100 mm (6.9" x 3.9")
Connectors: One DB-37 female connector
One 2-pin terminal block for extended ground
Power consumption:
5 V @ 850 mA (Typical)
5 V @ 1.0 A (Max.)
Operating temperature: 0 ~ 70º C (32º F ~ 158º F)
Storage temperature: -20 ~ 80º C (-4º F ~ 176º F)
Humidity: 5% ~ 95% non-condensing
4
PCI-1750 User's Manual
CHAPTER
2
Installation
Chapter 2 Installation
5
Initial Inspection
Before starting to install the PCI-1750, make sure there is no visible
damage on the card. We carefully inspected the card both mechanically and electrically before shipment. It should be free of marks and
in perfect order on receipt.
As you unpack the PCI-1750, check it for signs of shipping damage
(damaged box, scratches, dents, etc.) If it is damaged or fails to meet
specification, notify our service department or your local sales
representative immediately. Also, call the carrier immediately and
retain the shipping carton and packing materials for inspection by the
carrier. We will then make arrangements to repair or replace the unit.
Unpacking
The PCI-1750 contains components that are sensitive and vulnerable
to static electricity. Discharge any static electricity on your body to
ground by touching the back of the system unit (grounded metal)
before you touch the board.
Remove the PCI-1750 card from its protective packaging by grasping
the rear panel. Handle the card only by its edges to avoid static
discharge which could damage its integrated circuits. Keep the
antistatic package. Whenever you remove the card from the PC,
please store the card in this package for its protection.
You should also avoid contact with materials that hold static electricity such as plastic, vinyl and styrofoam.
Check the product contents inside the packing. There should be one
card, one CD-ROM, and this manual. Make sure nothing is missing.
6
PCI-1750 User's Manual
Location of Connectors
Figure 2.1 shows the names and locations of connectors on the board.
The PCI-1750 is a plug and play device. The PCI BIOS assigns the
system resources automatically at system start-up. All functions can
be set by software. No jumpers or switches are used on this card.
Figure 2.1: Board connectors
Chapter 2 Installation
7
PCI-1750 Block Diagram
IDI 0~7
IDI 8~15
IDO 0~7
IDO 8~15
Interrupt
Control
Logic
Counter
Figure 2.2: Block Diagram
8
PCI-1750 User's Manual
Counter 2
Connector Pin Assignments
IDI 0
IDI 2
IDI 4
IDI 6
IDI 8
IDI 10
IDI 12
IDI 14
IGND
COM1
IDO 0
IDO 2
IDO 4
IDO 6
IDO 8
IDO 10
IDO 12
IDO 14
COM2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
IDI 1
IDI 3
IDI 5
IDI 7
IDI 9
IDI 11
IDI 13
IDI 15/Counter2
IGND
IGND
IDO 1
IDO 3
IDO 5
IDO 7
IDO 9
IDO 11
IDO 13
IDO 15
Description of pin use:
IDI 0 ~ IDI 15: Isolated digital input pins
IDO 0 ~ IDO 15: Isolated digital output pins
IGND: Isolated ground
COM1: Common pin for connecting inductive loads of isolated output
channels IDO 0 ~ IDO 7
COM2: Common pin for connecting inductive loads of isolated output
channels IDO 8 ~ IDO 15
Counter2: Input pin of isolated counter (shared with IDI 15)
Warning: Be careful when wiring digital input lines. Never apply a
negative voltage to the isolated input pins, as this may
damage the PCI-1750.
Chapter 2 Installation
9
Installation Instructions
The PCI-1750 can be installed in any PCI slot in the computer. How ever,
refer to the computer user's manual to avoid any mistakes and
danger before you follow the installation procedure below:
1
. Turn off your computer and any accessories connected to the
computer.
Warning:
TURN OFF your computer power supply whenever
you install or remove any card, or connect and
disconnect cables.
2
. Disconnect the power cord and any other cables from the back of
the computer
3
. Remove the cover of the computer.
4
. Select an empty 5 V PCI slot. Remove the screw that secures the
expansion slot cover to the system unit. Save the screw to secure
the interface card retaining bracket.
5
. Carefully grasp the upper edge of the PCI-1750. Align the hole in
the retaining bracket with the hole on the expansion slot and align
the gold striped edge connector with the expansion slot socket.
Press the card into the socket gently but fi
rmly. Makesure the card
fits the slot tightly.
6
. Secure the PCI-1750 by screwing the mounting bracket to the back
panel of computer.
7
. Attach any accessories (cable, wiring terminal, etc.) to the card.
8
. Replace the coverofyour computer. Connect the cablesyou
removed in step 2.
9
. Turn the computer power on.
10
PCI-1750 User's Manual
CHAPTER
3
Operation
Chapter 3 Function Description
11
Operation
This chapter describes the operation of the PCI-1750. The driver
software provided allows a user to access all of the card's functions
without register level programming. Please see the User's Manual for
the driver bundled with this card for more information. For users who
prefer to implement their own bit-level programming to drive the
card's functions, information useful for making such a program is
included in this chapter.
Isolated Digital I/O Ports
Introduction
The PCI-1750 has 16 isolated digital input channels designated
IDI 0 ~ IDI 15, and 16 isolated digital output channels designated
IDO 0 ~ IDO 15. Data can be read from or written to the card's
channels.
Interrupt function of the DIO signals
Tw o I/O channels (IDI 0 and IDI 8) can be used to generate hard ware
interrupts. A user can program the interrupt control register [Base +
(32Dec)] to select the interrupt sources. Refer to Section "Interrupt
Function" for details about interrupt control.
Power
On
Configuration
The default configuration after power on, hardware reset or software
reset is to set all the isolated output channels to low so that users need
not worry about damaging external devices during system start up or
reset.
12
PCI-1750 User's Manual
Isolated
Inputs
Each of 16 isolated digital input channels accepts dry contacts or 5 ~
48 VD C voltage inputs. All sixteen input channels share 3 ground pins
and one extended ground terminal block (CN5).
Figure 3.1 shows how to connect an external input source to one of
the card's isolated input channels.
Warning!
Be careful when wiring digital input cables. Never
apply a negative voltage to an isolated input pin, as
this may damage the PCI-1750.
Note for wet contacts: A malfunction might occur in cases where the
internal resistance of a voltage source under wet contacts is significant
(>5 kW ). It is advisable to connect a parallel 5 kW , 0.5 W resistor to
avoid a voltage rise inside the voltage source.
ISO 5V
PC 5V
5 KΩ
0.5 W
Figure 3.1: Connecting external input source
Isolated Outputs
Each of 16 isolated digital output channels comes equipped with a
Darlington transistor. Every eight output channels share common
collectors and integral suppression diodes for inductive loads.
Channels 0 ~ 7 use COM1, and channels 8 ~ 15 use COM2 as a
common pin.
Chapter 3 Function Description
13
Note: If an external voltage (5 ~ 48 V) is applied to an isolated output
channel (IDO 0 ~ IDO 15) while it is being used as an output
channel, the current will flow from the external voltage source
to the card. Please take care that the current through each GND
pin not exceed 200 mA. Use the extended ground connector
CN5 to shunt the current to the external voltage source ground.
Figure 3.2 shows how to connect an external output load to the card's
isolated outputs.
Figure 3.2: Connecting an external output load
Timer and Counter
Introduction
The PCL-1750 includes one 8254 compatible programmable timer/
counter chip which provides two 16-bit timers and one counter,
designated as Timer 0, Timer 1 and Counter 2. Timer 0 and Timer 1
are cascaded to be a 32-bit timer, with its input connected to a 10
MHz oscillator and its gate control pulled high (enabled). Counter 2
of the 8254 chip is a 16-bit high-speed (1 MHz) isolated event counter
(it shares a pin with isolated IDI 15). The block diagram of the timer/
counter system of PCI-1750 is shown in Figure 3.3.
14
PCI-1750 User's Manual
Timers 0 and 1 are usually set in mode 3 (square wave generator) to
generate periodic watchdog interrupts. Counter 2 can be set in mode
0 (stop on terminal count) for measuring frequency, or in mode 3
(square wave generator) to generate periodic watchdog interrupts or to
be used as an event counter. For more details on the operating modes
of the 8254 counter chip, please refer to Appendix A.
Figure 3.3: Block diagram of timer/counter
Timer/Counter
Frequency
and
Interrupt
The input clock frequency of the counter/timers is 10 MHz. The output
of both Timer 1 and Counter 2 can generate interrupts to the system
(refer to Section 3.3). The maximum and minimum timer interrupt
frequency is (10 MHz)/(2x2)=(2.5 MHz) and (10 MHz)/
(65535*65535)=0.002328 Hz, respectively.
Chapter 3 Function Description
15
The gates of the counter/timersareinternally pulled to +5 V,
keeping
the gate control always enabled.
Interrupt
Function
Introduction
Four input channels (IDI 0, IDI 4, IDI 8 and IDI 12) and the output of
Timer 1 and Counter 2 are connected to the interrupt circuitry. The
"Interrupt Control Register" of the PCI-1750 controls how the
combination of the six signals generates an interrupt. Two interrupt
request signals, designated "interrupt group 0" and "interrupt group
1", can be generated at the same time, and then the software can
service these two request signals by ISR. IDI 0, IDI 4 and Timer 1 are
connected to interrupt port 0, IDI 8, IDI 12 and Counter 2 are connected to interrupt port 1. The dual interrupt sources provide the card
with more capability and flexibility.
IRQ Level
The IRQ level is set automatically by the PCI plug and play BIOS and
is saved in the PCI controller. There is no need for users to set the
IRQ level. Only one IRQ level is used by this card, although it has
two interrupt sources.
Interrupt Control Register [Base + 32(Dec)]
The "Interrupt Control Register" [Base + 32(Dec)] controls the
interrupt signal source, edge and flag.Table 3.1 shows the bit map of
theinterrupt controlregister.Theregisterisareadable/writable
register.When writingtoit, it is used as a controlregister,and when
reading from it, itisusedasastatusregister.
Interrupt
Source #
Interrupt Group 1
Interrupt Group 0
Bi t #
D7
D6
D5
D4
D3
D2
D1
D0
Abbreviation
F1
E1
M11
M10
F0
E0
M01
M00
Table3.1:Interr
upt contr
olr
eg
ister bit ma
p
rupt
contro
reg
egi
ap
16
PCI-1750 User's Manual
M00 and M01: "mode bits" of interrupt Group 0
M10 and M11: "mode bits" of interrupt Group 1
E0,E1: triggering edge control bits
F0, F1: flag bits
Interrupt
Source
Control
The "mode bits" written into the interrupt control register determine
the allowable sources of signals generating an interrupt. Bit 0 and bit
1 determine the interrupt source for interrupt group 0, and bit 4 and bit
5 determine the interrupt source for interrupt group 1, as indicated in
Figure 3.4. Table 3.2 shows the relationship between an interrupt
source and the values in the mode bits.
Figure 3.4: Interrupt source control
Chapter 3 Function Description
17
Interrupt Group 1
Interrupt Group 0
M11
M10
Description
M01
M00
Description
0
0
Disable interrupt
0
0
Disable interrupt
0
1
Source = IDI 8
0
1
Source = IDI 0
1
0
Source = IDI 8 & IDI 12
1
0
Source = IDI 0 & IDI 4
1
1
Source = Counter 2
1
1
Source = Timer 1
Table3.2Interr
upt mode bit v
alues
rupt
values
Interrupt Triggering Edge Control
The interrupt can be triggered by a rising edge or a falling edge of the
interrupt signal, as determined by the value in the "triggering edge
control" bit in the interrupt control register, as shown in Table 3.3.
E 0 or E 1
Triggering edge of interrupt signal
1
Rising edge trigger
0
Falling edge trigger
Table3.3 Trigger
ing edge contr
alues
iggering
contro
values
olbitv
Interrupt Flag Bit
The "interrupt flag" bit is a flag indicating the status of an interrupt. It
is a readable and writable bit. Read the bit value to find the status of
the interrupt, write "1" to this bit to clear the interrupt. This bit must
be cleared in the ISR to service the next incoming interrupt.
F0 & F1
Read
Write
Interrupt status
1
Interrupt
0
No interrupt
1
Clear interrupt
0
Don’t care
Table3.4:Interr
uptf
lag bit v
alues
ru
fl
values
18
PCI-1750 User's Manual
APPENDIX
A
Function of 8254
Counter Chip
Appendix A Function of 8254 counter Chip
19
The Intel 8254
The PCI-1750 uses one Intel 8254 compatible programmable interval
timer/counter chip. The popular 8254 offers three independent 16-bit
down counters. Each counter has a clock input, control gate and an
output. You can program each counter for maximum count values
from 2 to 65535.
The 8254 has a maximum input clock frequency of 10 MHz. The
PCI-1750 provides 10 MHz input frequencies to the counter chip from
an on-board crystal oscillator.
On the PCI-1750, the 8254 chip's Timer 0 and Timer 1 are cascaded
to be a 32-bit programmable timer.
Counter read/write and control registers
The 8254 programmable interval timer uses four registers at addresses
BASE + 24(Dec), BASE + 25(Dec), BASE + 26(Dec) and
BASE + 27(Dec) for read, write and control of counter functions.
Register functions appear below:
Register
BASE + 24(Dec)
Function
Counter 0 read/write
BASE + 25(Dec)
Counter 1 read/write
BASE + 26(Dec)
Counter 2 read/write
BASE + 27(Dec)
Counter control word
Since the 8254 counter uses a 16-bit structure, each section of
read/write data is split into a least significant byte (LSB) and most
significant byte (MSB). To avoid errors it is important that you make
read/write operations in pairs and keep track of the byte order.
The data format for the control register appears below:
BASE+27(Dec) 8254 control, standard mode
Bit
Value
20
D7
D6
D5
D4
D3
D2
D1
D0
SC1
SC0
RW1
RW0
M2
M1
M0
BCD
PCI-1750 User's Manual
Description:
SC1 & SC0
Select counter.
Counter
0
SC1
0
SC0
0
1
0
1
2
1
0
Read-back command
1
1
RW1 & RW0
Select read/write operation
Operation
Counter latch
RW1
0
RW0
0
Read/write LSB
0
1
Read/write MSB
1
0
Read/write LSB first,
then MSB
1
1
M2, M1 & M0
Select operating mode
M2
0
M1
0
M0
0
Mode
0 programmable one shot
0
0
1
1
X
1
0
2 Rate generator
X
1
1
3 Square wave rate generator
1
0
0
4 Software triggered strobe
1
0
1
5 Hardware triggered strobe
BCD
programmable one shot
Select binary or BCD counting.
BCD
0
Type
Binary counting 16-bits
1
Binary coded decimal (BCD) counting
Appendix A Function of 8254 counter Chip
21
If you set the module for binary counting, the count can be any
number from 0 up to 65535. If you set it for BCD (Binary Coded
Decimal) counting, the count can be any number from 0 to 9999.
If you set both SC1 and SC0 bits to 1, the counter control register is in
read-back command mode. The control register data format then
becomes:
BASE + 27(Dec) 8254 control, read-back mode
Bit
D7
D6
D5
D4
D3
D2
1
1
CNT STA
C2
C1
Value
D1
D0
C0
X
CNT = 0
Latch count of selected counter(s).
STA = 0
Latch status of selected counter(s).
C2, C1 & C0
Select counter for a read-back operation.
C2 = 1 select Counter 2
C1 = 1 select Counter 1
C0 = 1 select Counter 0
If you set both SC1 and SC0 to 1 and STA to 0, the register selected
by C2 to C0 contains a byte which shows the status of the counter.
The data format of the counter read/write register then becomes:
22
BASE+24/25/26(Dec)
Status read-back mode
Bit
Value
D7
D6
D5
D4
D3
D2
D1
D0
OUT
NC
RW1
RW0
M2
M1
M0
BCD
OUT
Current state of counter output
NC
Null count is 1 when the last count written to the counter
register has been loaded into the counting element
PCI-1750 User's Manual
Counter operating modes
MODE 0 – Stop on terminal count
The output will be initially low after you set this mode of operation.
After you load the count into the selected count register, the output
will remain low and the counter will count. When the counter reaches
the terminal count, its output will go high and remain high until you
reload it with the mode or a new count value. The counter continues
to decrement after it reaches the terminal count. Rewriting a counter
register during counting has the following results:
1. Writing to the first byte stops the current counting.
2. Writing to the second byte starts the new count.
MODE 1 – Programmable one-shot
The output is initially high. The output will go low on the count
following the rising edge of the gate input. It will then go high on the
terminal count. If you load a new count value while the output is low,
the new value will not affect the duration of the one-shot pulse until
the succeeding trigger. You can read the current count at any time
without affecting the one-shot pulse. The one-shot is retriggerable,
thus the output will remain low for the full count after any rising edge
at the gate input.
MODE 2 – Rate generator
The output will be low for one period of the input clock. The period
from one output pulse to the next equals the number of input counts in
the counter register. If you reload the counter register between output
pulses, the present period will not be affected, but the subsequent
period will reflect the value.
The gate input, when low, will force the output high. When the gate
input goes high, the counter will start from the initial count. You can
thus use the gate input to synchronize the counter.
With this mode the output will remain high until you load the count
register. You can also synchronize the output by software.
Appendix A Function of 8254 counter Chip
23
MODE 3 – Square wave generator
This mode is similar to Mode 2, except that the output will remain
high until one half of the count has been completed (for even numbers), and will go low for the other half of the count. This is accomplished by decreasing the counter by two on the falling edge of each
clock pulse. When the counter reaches the terminal count, the state of
the output is changed, the counter is reloaded with the full count and
the whole process is repeated.
If the count is odd and the output is high, the first clock pulse (after
the count is loaded ) decrements the count by 1. Subsequent clock
pulses decrement the count by 2. After timeout, the output goes low
and the full count is reloaded. The first clock pulse (following the
reload) decrements the counter by 3. Subsequent clock pulses decrement the count by two until timeout, then the whole process is
repeated. In this way, if the count is odd, the output will be high for
(N+1)/2 counts and low for (N-1)/2 counts.
MODE 4 – software triggered strobe
After the mode is set, the output will be high. When the count is
loaded, the counter will begin counting. On terminal count, the output
will go low for one input clock period then go high again.
If you reload the count register during counting, the new count will be
loaded on the next CLK pulse. The count will be inhibited while the
GATE input is low.
MODE 5 – Hardware triggered strobe
The counter will start counting after the rising edge of the trigger
input and will go low for one clock period when the terminal count is
reached. The counter is retriggerable.
24
PCI-1750 User's Manual
Counter operations
Read/write
operation
Before you write the initial count to each counter, you must first
specify the read/write operation type, operating mode and counter
type in the control byte and write the control byte to the control
register [BASE + 27(Dec)].
Since the control byte register and all three counter read/write
registers have separate addresses and each control byte specifies the
counter it applies to (by SC1 and SC0), no instructions on the operating sequence are required. Any programming sequence following the
8254 convention is acceptable.
There are three types of counter operation: read/load LSB, read /load
MSB and read /load LSB followed by MSB. It is important that you
make your read/write operations in pairs and keep track of the byte
order.
Counter read-back command
The 8254 counter read-back command lets you check the count value,
programmed mode and current states of the OUT pin and Null Count
flag of the selected counter(s). You write this command to the control
word register. Format is as shown at the beginning of this section.
The read-back command can latch multiple counter output latches.
Simply set the CNT bit to 0 and select the desired counter(s). This
single command is functionally equivalent to multiple counter latch
commands, one for each counter latched.
The read-back command can also latch status information for selected
counter(s) by setting STA bit = 0. The status must be latched to be
read; the status of a counter is accessed by a read from that counter.
The counter status format appears at the beginning of the chapter.
Appendix A Function of 8254 counter Chip
25
Counter latch operation
Users often want to read the value of a counter without disturbing the
count in progress. You do this by latching the count value for the
specific counter then reading the value.
The 8254 supports the counter latch operation in two ways. The first
way is to set bits RW1 and RW0 to 0. This latches the count of the
selected counter in a 16-bit hold register. The second way is to
perform a latch operation under the read-back command. Set bits SC1
and SC0 to 1 and CNT = 0. The second method has the advantage of
operating several counters at the same time. A subsequent read
operation on the selected counter will retrieve the latched value.
26
PCI-1750 User's Manual
APPENDIX
B
Register Format of
PCI-1750
Appendix B Register Format of PCI-1750
27
Register Format of PCI-1750
Function
Base Address +
(Decimal)
Read
Write
0
IDI 0 ~ 7
IDO 0 ~ 7
1
IDI 8 ~ 15
IDO 8 ~ 15
2 ~ 23
Reserve
Reserve
24
8254 Counter 0
8254 Counter 0
25
8254 Counter 1
8254 Counter 1
26
8254 Counter 2
8254 Counter 2
8254 Control
Register
27
28
28
Reserved
Reserved
29
Reserved
Reserved
30
Reserved
Reserved
31
Reserved
Reserved
32
Interrupt Status
Register
Interrupt Control
Register
PCI-1750 User's Manual

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