CMX208
ISDN Dual Telephony
Protocol Engine
D/208/1 October 1999
Advance Information
Features
•
•
•
•
•
Applications
•
•
•
•
•
Supports Incoming and Outgoing Calls
Independent Port Configuration
Flexible B-channel Mapping
Supports CTR3 Approval
Full API Available
Feature Phones
Pay-Phones
PABX Telephones
DECT Cordless Phones
Reference Designs Available
1.1
Brief Description
The CMX208 is an ISDN telephony protocol engine which implements the lower level ISDN interface and
communicates with the CMX605 and other standard devices to form a fully integrated ISDN chipset for voice
communications. The CMX208 puts all the main data processing elements in a single device. No ISDN
software has to be written and simple ‘Plug and Play’ design results. This reduces development time and
provides a highly cost-effective hardware solution. By using proven circuit designs, the designer can move
quickly from initial concept through design in to manufacture.
The CMX208 supports two voice ports over the ISDN line, which can be used to provide ISDN telephony
services or POTS line interfaces, and has independent keypad-configuration of these services for each port.
The CMX208’s feature set and architecture allow most analogue systems to be converted to an ISDN
equivalent with enhanced features.
The CMX208 is designed to work with the AMD 79C30 S/T bus interface, the Motorola MC145480 PCM codec
and the CML CMX605 POTS interface circuit, and also comes complete with embedded applications software.
To support the CMX208, CML can also provide licensed reference designs on user request. A flexible
Applications Program Interface (API) allows users to customise the features and operation of their own design.
The CMX208 comes in a compact 80-pin surface mount package.
©
1999
Consumer Microcircuits Limited
©
1999
Chiron Technology Limited
ISDN Dual Telephony Protocol Engine
CMX208
CONTENTS
Section
Page
1.0 Features and Applications .........................................................................1
1.1 Brief Description.........................................................................................1
1.2 Block Diagram ............................................................................................3
1.3 Signal List ...................................................................................................4
1.4 External Components.................................................................................8
1.5 General Description....................................................................................9
1.5.1 Glossary
....................................................................................10
1.5.2 Initialisation...............................................................................11
1.5.3 ISDN Interface............................................................................11
1.5.3.1 Activation.....................................................................11
1.5.3.2 De-activation or Line Disconnection .............................11
1.5.3.3 Line Failure Detection ..................................................11
1.5.3.4 Incoming Calls .............................................................11
1.5.3.5 Multiple Subscriber Numbering.....................................12
1.5.3.6 Channel Mapping.........................................................12
1.5.4 POTS Configuration..................................................................13
1.5.4.1 Configuration and Control via DTMF Keypad................13
1.5.5 POTS Operation
........................................................................15
1.5.5.1 Keypad Operation ........................................................15
1.5.5.2 Incoming POTS Calls...................................................15
1.5.5.3 Outgoing POTS Calls...................................................15
1.5.5.4 Connected Calls...........................................................16
1.5.5.5 Call Clearing ................................................................16
1.5.6 Application Programmer's Interface
........................................17
1.5.7 Hardware Description
...............................................................17
1.5.7.1 LED Status Indicators (LED1 to LED9, and ILFI)..........17
1.6 Application Notes .....................................................................................18
1.6.1 General
......................................................................................18
1.6.2 Approvals
..................................................................................18
1.7 Performance Specification.......................................................................19
1.7.1 Electrical Performance..............................................................19
1.7.1.1 Absolute Maximum Ratings..........................................19
1.7.1.2 Operating Limits...........................................................19
1.7.1.3 Operating Characteristics.............................................20
1.7.2 Packaging..................................................................................25
Note:
This product is in development: Changes and additions will be made to this
specification. Items marked TBD or left blank will be included in later issues.
Information in this data sheet should not be relied upon for final product design.
©
1999
Consumer Microcircuits Limited
©
1999
Chiron Technology Limited
2
D/208/1
ISDN Dual Telephony Protocol Engine
CMX208
1.2
Block Diagram
Figure 1 Block Diagram
©
1999
Consumer Microcircuits Limited
©
1999
Chiron Technology Limited
3
D/208/1
ISDN Dual Telephony Protocol Engine
CMX208
1.3
Signal List
S1 Package
80QFP
Pin No.
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
Signal
Description
Name
SCL
SDA
ISDNRST
N/C
N/C
N/C
RSTN
DV
DD1
XTALN
XTAL
DV
SS1
LED1
LED2
N/C
LED4
N/C
N/C
N/C
LED8
STN
LED9
WRN
RDN
A19
A18
A17
A16
A15
Type
O/P
BI
O/P
O/P
O/P
O/P
I/P
Power
O/P
I/P
Power
O/P
O/P
O/P
O/P
O/P
O/P
O/P
O/P
O/P
O/P
O/P
O/P
O/P
O/P
O/P
O/P
O/P
EEPROM - Serial Clock
EEPROM - Serial Data
ISDN S-interface Chip Reset
Do not make any connection to this pin
Do not make any connection to this pin
Do not make any connection to this pin
CMX208 Chip Reset (active low)
The digital positive supply rail. Levels and voltages are
dependent upon this supply. This pin should be
decoupled to DV
SS
by a capacitor
The output of the on-chip Xtal oscillator inverter
The input to the oscillator inverter from the Xtal circuit
The digital negative supply rail (ground)
POTS Port 1 Off-Hook Indicator (HK1)
POTS Port 2 Off-Hook Indicator (HK2)
Do not make any connection to this pin
POTS Port 2 Call Connected Indicator (CN2)
Do not make any connection to this pin
Do not make any connection to this pin
Do not make any connection to this pin
ISDN Line Activated Indicator (AR)
Watchdog Timer Stimulus
POTS Port 1 Call Connected Indicator (CN1)
Memory Write Access Strobe
Memory Read Access Strobe
Memory and Peripheral Address Bus
Memory and Peripheral Address Bus
Memory and Peripheral Address Bus
Memory and Peripheral Address Bus
Memory and Peripheral Address Bus
©
1999
Consumer Microcircuits Limited
©
1999
Chiron Technology Limited
4
D/208/1
ISDN Dual Telephony Protocol Engine
CMX208
S1 Package
80QFP
Pin No.
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
Signal
Description
Name
A14
A13
A12
A11
A10
A9
A8
A/D7
A/D6
A/D5
A/D4
A/D3
A/D2
A/D1
A/D0
ASTB
DV
SS0
~
N/C
RINGP2
RINGN2
API-RXD
API-TXD
CLIP2
B1/B2N
ILFI
DV
DD0
Type
O/P
O/P
O/P
O/P
O/P
O/P
O/P
BI
BI
BI
BI
BI
BI
BI
BI
O/P
Power
I/P
O/P
O/P
O/P
I/P
O/P
O/P
O/P
O/P
Power
Memory and Peripheral Address Bus
Memory and Peripheral Address Bus
Memory and Peripheral Address Bus
Memory and Peripheral Address Bus
Memory and Peripheral Address Bus
Memory and Peripheral Address Bus
Memory and Peripheral Address Bus
Memory and Peripheral Address and Data Bus
Memory and Peripheral Address and Data Bus
Memory and Peripheral Address and Data Bus
Memory and Peripheral Address and Data Bus
Memory and Peripheral Address and Data Bus
Memory and Peripheral Address and Data Bus
Memory and Peripheral Address and Data Bus
Memory and Peripheral Address and Data Bus
Address/Data Bus Strobe (data bus selected if low)
The digital negative supply rail (ground)
For manufacturer's use only. Connect to DV
SS
directly
Do not make any connection to this pin
POTS Port 2 Ringing Generator (low when not ringing)
POTS Port 2 Ringing Generator (high when not ringing)
API/RS232 Port Rx Data (inactive = high)
API/RS232 Port Tx Data (high when inactive)
POTS Port 2 Line Voltage Adjustment (low if sending
FSK to a Caller Display unit, as it is intended to make
the SLIC present a high impedance to the POTS line)
B-channel Select (high selects channel B1).
ISDN Line Failure Indicator
The digital positive supply rail. Levels and voltages are
dependent upon this supply. This pin should be
decoupled to DV
SS
by a capacitor
©
1999
Consumer Microcircuits Limited
©
1999
Chiron Technology Limited
5
D/208/1
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