CMLMICRO CMX208

CMX208
ISDN Dual Telephony
Protocol Engine
D/208/1 October 1999
Advance Information
Features
Applications
•
Supports Incoming and Outgoing Calls
•
Feature Phones
•
Independent Port Configuration
•
Pay-Phones
•
Flexible B-channel Mapping
•
PABX Telephones
•
Supports CTR3 Approval
•
DECT Cordless Phones
•
Full API Available
•
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
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1.2
CMX208
Block Diagram
Figure 1 Block Diagram
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1.3
CMX208
Signal List
S1 Package
80QFP
Signal
Description
Pin No.
Name
Type
1
SCL
O/P
EEPROM - Serial Clock
2
SDA
BI
EEPROM - Serial Data
3
ISDNRST
O/P
ISDN S-interface Chip Reset
4
N/C
O/P
Do not make any connection to this pin
5
N/C
O/P
Do not make any connection to this pin
6
N/C
O/P
Do not make any connection to this pin
7
RSTN
I/P
CMX208 Chip Reset (active low)
8
DVDD1
Power
9
XTALN
O/P
The output of the on-chip Xtal oscillator inverter
10
XTAL
I/P
The input to the oscillator inverter from the Xtal circuit
11
DVSS1
Power
The digital negative supply rail (ground)
12
LED1
O/P
POTS Port 1 Off-Hook Indicator (HK1)
13
LED2
O/P
POTS Port 2 Off-Hook Indicator (HK2)
14
N/C
O/P
Do not make any connection to this pin
15
LED4
O/P
POTS Port 2 Call Connected Indicator (CN2)
16
N/C
O/P
Do not make any connection to this pin
17
N/C
O/P
Do not make any connection to this pin
18
N/C
O/P
Do not make any connection to this pin
19
LED8
O/P
ISDN Line Activated Indicator (AR)
20
STN
O/P
Watchdog Timer Stimulus
21
LED9
O/P
POTS Port 1 Call Connected Indicator (CN1)
22
WRN
O/P
Memory Write Access Strobe
23
RDN
O/P
Memory Read Access Strobe
24
A19
O/P
Memory and Peripheral Address Bus
25
A18
O/P
Memory and Peripheral Address Bus
26
A17
O/P
Memory and Peripheral Address Bus
27
A16
O/P
Memory and Peripheral Address Bus
28
A15
O/P
Memory and Peripheral Address Bus
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The digital positive supply rail. Levels and voltages are
dependent upon this supply. This pin should be
decoupled to DVSS by a capacitor
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ISDN Dual Telephony Protocol Engine
S1 Package
80QFP
CMX208
Signal
Description
Pin No.
Name
Type
29
A14
O/P
Memory and Peripheral Address Bus
30
A13
O/P
Memory and Peripheral Address Bus
31
A12
O/P
Memory and Peripheral Address Bus
32
A11
O/P
Memory and Peripheral Address Bus
33
A10
O/P
Memory and Peripheral Address Bus
34
A9
O/P
Memory and Peripheral Address Bus
35
A8
O/P
Memory and Peripheral Address Bus
36
A/D7
BI
Memory and Peripheral Address and Data Bus
37
A/D6
BI
Memory and Peripheral Address and Data Bus
38
A/D5
BI
Memory and Peripheral Address and Data Bus
39
A/D4
BI
Memory and Peripheral Address and Data Bus
40
A/D3
BI
Memory and Peripheral Address and Data Bus
41
A/D2
BI
Memory and Peripheral Address and Data Bus
42
A/D1
BI
Memory and Peripheral Address and Data Bus
43
A/D0
BI
Memory and Peripheral Address and Data Bus
44
ASTB
O/P
45
DVSS0
Power
46
~
I/P
For manufacturer's use only. Connect to DVSS directly
47
N/C
O/P
Do not make any connection to this pin
48
RINGP2
O/P
POTS Port 2 Ringing Generator (low when not ringing)
49
RINGN2
O/P
POTS Port 2 Ringing Generator (high when not ringing)
50
API-RXD
I/P
API/RS232 Port Rx Data (inactive = high)
51
API-TXD
O/P
API/RS232 Port Tx Data (high when inactive)
52
CLIP2
O/P
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)
53
B1/B2N
O/P
B-channel Select (high selects channel B1).
54
ILFI
O/P
ISDN Line Failure Indicator
55
DVDD0
Power
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Address/Data Bus Strobe (data bus selected if low)
The digital negative supply rail (ground)
The digital positive supply rail. Levels and voltages are
dependent upon this supply. This pin should be
decoupled to DVSS by a capacitor
5
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S1 Package
80QFP
CMX208
Signal
Description
Pin No.
Name
Type
56
RINGP1
O/P
POTS Port 1 Ringing Generator (low when not ringing)
57
RINGN1
O/P
POTS Port 1 Ringing Generator (high when not ringing)
58
CLIP1
O/P
POTS Port 1 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)
59
ILINE1
I/P
POTS Port 1 Hook Switch Status Detector
(on-hook = low)
60
ILINE2
I/P
POTS Port 2 Hook Switch Status Detector
(on-hook = low)
61
REPLY
I/P
CMX605 C-BUS Interface - Reply Data
62
CMDDATA
O/P
CMX605 C-BUS Interface - Command Data
63
SER-CLK
O/P
CMX605 C-BUS Interface - Serial Clock
64
AVDD
Power
The positive analogue supply rail. Levels and voltages
are dependent upon this supply. This pin should be
decoupled to AVSS by a capacitor
65
AVREF1
Power
A/D Reference Voltage. Connect to AVDD directly
66
AVSS
Power
The negative analogue supply rail (ground)
67
CSN1
O/P
CMX605 C-BUS Interface (chip select POTS Port 1)
68
CSN2
O/P
CMX605 C-BUS Interface (chip select POTS Port 2)
69
AVREF2
Power
D/A Reference Voltage. Connect to AVDD directly
70
AVREF3
Power
D/A Reference Voltage. Connect to AVSS directly
71
NMI
I/P
For manufacturer's use only. Connect to DVSS directly
72
API-INT
I/P
API Interrupt (inactive = high)
73
IRQN
I/P
CMX605 C-BUS Interface - Interrupt (inactive = high)
74
~
I/P
For manufacturer’s use only. Connect to DVSS directly
75
∼
I/P
For manufacturer’s use only. Connect to DVSS directly
76
∼
I/P
For manufacturer’s use only. Connect to DVSS directly
77
ISDNINT
I/P
ISDN S-interface Chip Interrupt
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S1 Package
80QFP
CMX208
Signal
Description
Pin No.
Name
Type
78
∼
I/P
For manufacturer’s use only. Connect to DVSS directly
79
∼
I/P
For manufacturer’s use only. Connect to DVSS directly
80
N/C
O/P
Do not make any connection to this pin
Notes: I/P =
O/P =
BI
=
Input
Output
Bidirectional
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1.4
CMX208
External Components
Note: This product is to be used as part of a chip-set. Please refer to the Applications Section
(section 1.6) for details of the recommended chip-set.
Figure 2 CMX208 Pinout
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1.5
CMX208
General Description
The CMX208 is a single-chip data processor which has been mask programmed with firmware to
implement an ISDN protocol stack. This enables the CMX208 to provide two analogue (POTS) ports
with an ISDN S-bus network connection. Key variables are stored in an external EEPROM and the
user can provide additional features by adding external ROM and RAM. Access to the firmware
Application Programmer's Interface (API) facilitates the seamless integration of the user's additional
features with the pre-programmed ISDN to POTS interfaces.
The CMX208 is intended for use as part of an ISDN chipset and all descriptions in this data sheet refer
to this implementation, which is shown diagrammatically in Figure 3. The use of alternative chipsets is
not supported.
The firmware supports connection to an ISDN S-bus network interface via the AMD AM79C30 ST
controller with integral PCM codec for a single POTS port. An auxiliary Motorola MC145480 PCM
codec will need to be added for the second POTS port.
The CMX208 interfaces with up to two CMX605 Tone Generator and DTMF Receiver chips, which
decode incoming DTMF tones and generate call progress signals (eg busy tone) normally originating
from an analogue telephone exchange. The firmware translates the CMX605 data into ISDN Dchannel commands and vice versa to support both incoming and outgoing calls. For the ISDN
interface, D-channel commands sufficient for standard telephony applications are implemented. With
the aid of a small amount of discrete circuitry, exchange battery voltage, ringing current, line reversal
and off-hook detection are also supported, to complete the POTS interface. The CMX208 has
dedicated outputs for visible indicators (LEDs) which can be used to provide information on the call
status. Support for Multiple Subscriber Numbering is also included in the firmware.
The CMX208 can be configured by means of keypad programming via either POTS port.
Configuration parameters allow the user to change (for example) the format and cadence of the
ringing signal, so as to facilitate use of the CMX208 in different countries. Each POTS interface is
able to configure the variables relevant to its own use.
An Application Programmer's Interface (API) is available and is described separately in section 1.5.6.
Further details are available on completion of a Non-Disclosure Agreement. Please contact CML
Sales directly for further details.
The firmware and finite state machine embedded in the CMX208 have been used in products which
have gained ETSI CTR3 approval.
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1.5.1
CMX208
Glossary
ACCM
API
CIDCW
CLI
CRC
CTS
DCD
DDI
DTE
DTMF
DTR
HDLC
IA5
IE
ILFI
ISDN
LAPB
LAPD
LCGN
LED
LLI
MFO
MSN
NU
NUA
NUI
PAD
PC
PCM
POTS
PPP
PVC
RI
RNR
RR
RTS
SABM
SABME
SLIC
SPM
SVC
TEI
Asynchronous Control Character Map
Application Programmer’s Interface
Caller Identification During Call Waiting
Calling Line Identification
Cyclic Redundancy Check
Clear to Send
Data Carrier Detect
Direct Dialling Inwards
Data Terminal Equipment
Dual Tone Multiple Frequency
Data Terminal Ready
High Level Data Link Control
International Alphabet No 5
Information Element
ISDN Line Failure Indicator
Integrated Services Digital Network
Link Access Procedure - Balanced
Link Access Procedure on the D-Channel
Logical Channel Group Number
Light Emitting Diode
Logical Link Identifier
Multiple Frame Operation
Multiple Subscriber Numbering
Number Unobtainable
Network User Address
Network User Identification
Packet Assembler/Disassembler
Personal Computer
Pulse Code Modulation
Plain Old (Analogue) Telephone Service
Point to Point Protocol
Permanent Virtual Circuit
Ring Indication
Receiver Not Ready
Receiver Ready
Ready to Send
Set Asynchronous Balanced Mode
Set Asynchronous Balanced Mode Extended
Subscriber Line Interface Circuit
Subscriber Pulse Metering
Switched Virtual Circuit
Terminal Endpoint Identifier
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1.5.2
CMX208
Initialisation
On power-up, the CMX208 assumes its default values, which are factory programmed into the
firmware. It then performs a self-test, during which all of the LED pins and the ILFI pin are held high
for 3s. If the test is unsuccessful, the CMX208 remains in this condition.
If the test is successful, the CMX208 reads its preset values from the attached EEPROM and
examines the state of the ISDN link (ie Layer 1) before commencing normal operation. On power-up,
the ISDN link is de-activated, the POTS ports are assumed to be on-hook and ringing is disabled.
1.5.3
ISDN Interface
Two simultaneous voice calls are possible. Incoming calls are firstly checked for other calls present,
then the MSN is checked for validity, then the channel mapping, so that responses will be handled
accordingly.
When channel mapping is enabled, outgoing calls will request the channel enabled. When not
enabled, a request for any channel is made. If no free channels are available for outgoing calls, a
locally generated busy tone is returned to the analogue port.
1.5.3.1 Activation
Activation occurs in the following circumstances:
•
•
The ISDN network activates.
The device connected to the analogue port goes off hook.
The Terminal Endpoint Identifier (TEI) is negotiated. Line powering of the CMX208 is not supported.
The 'AR' indicator (LED8) toggles between high and low states when the CMX208 is powered up, and
remains constantly low once the CMX208 identifies an activated ISDN line.
ISDN line power detection is not implemented and the CMX208 will negotiate a new TEI on any new
network activation.
1.5.3.2 De-activation or Line Disconnection
De-activation or line disconnection causes the TEI to be removed. Upon re-connection the CMX208
will only be re-activated and request a new TEI when one of the conditions in the above section is met.
1.5.3.3 Line Failure Detection
If the line failure detection parameter is enabled (via either POTS port) the CMX208 will check that
Layer 2 communications are active every sample period of 30 seconds. If Layer 2 communications
are not active, the CMX208 will attempt to activate them. If they remain inactive for 2 sample periods,
the line is deemed to have failed, so then the ILFI pin is set high and both RINGP1 and RINGN1 pins
(port 1 only) are set low. The CMX208 continues to attempt to activate the line and if it becomes
active and stays active for 2 sample periods, then the ILFI pin is set low and both RINGP1 and
RINGN1 pins (port 1 only) are restored to their default settings.
1.5.3.4 Incoming Calls
Incoming voice calls and calls from analogue lines are directed to the analogue ports and all other
incoming calls are rejected with a Cause Information Element set to 'Incompatible Destination'.
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CMX208
1.5.3.5 Multiple Subscriber Numbering
Multiple Subscriber Numbering (MSN) enables each POTS port of the CMX208 to have its own
telephone number. Up to 23 digits can be saved as the MSN for each port.
All incoming SETUP messages will be checked for the presence of a Called Party Number Information
Element (IE). If one is present it is compared with the saved MSN number (if present), starting with
the last digit of both numbers. Comparison continues until there are no more numbers in the MSN
saved number or the incoming Called Party Number or there is a difference between the numbers.
The MSN is said to match if the saved MSN and the incoming calls’ Called Party Number are the
same for the duration of the shorter number (ie if the digit ‘1’ is saved and the received Called Party
Number is 654321, then the MSN matches). If there is no saved MSN, the Called Party Number is
ignored and call processing continues.
When there is a saved MSN and the Calling Party Number transmit is enabled, all outgoing call
SETUP messages will contain a Calling Party Number Information Element.
Note 1: When a CMX208 with MSN saved and Calling Party Number transmit enabled is
connected to some exchanges, no dial tone is heard when going off-hook.
Note 2: Disabling the Calling Party Number transmit will mean that the called party may not
receive the Calling Line Identification (CLI), or if they do receive a CLI it will probably be
the base number and not the number specific to the calling telephone.
1.5.3.6 Channel Mapping
It is possible to configure the CMX208 so that the analogue ports will only originate calls to and
respond to calls from a specific ISDN B-channel. This is a useful feature if, for example, you wish to
have a hunt group on your ISDN line (ie to select the next available channel) and only want one voice
port to ring on an incoming call.
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1.5.4
CMX208
POTS Configuration
1.5.4.1 Configuration and Control via DTMF Keypad
Configuration can be carried out at any time by causing the POTS port to go off-hook and then
immediately entering a configuration sequence of DTMF tones. The sequence signalled to the
CMX208 will determine the configuration to be performed, as shown in the following table.
Configuration
Sequence
S02S#
S81S#
S81S1n#
Name
Test watchdog
Disable CLI delivery on
port
Use V23 FSK for CLI
delivery
Description
Puts the CMX208 into a permanent
loop, not updating the external
watchdog counter, so after 2s it should
reset.
Inhibits CLI delivery on the analogue
POTS port
Configures modem standard to be used
for CLI delivery.
Default
n/a
n/a
n = alert mode
0 = FSK follows ring burst as per
ETS 300 659-1 para. 6.1.1
1 = FSK follows dual tone alert as per
ETS300 659-1 para. 6.1.2.a
Disabled
2 = FSK follows ringing pulse alert as
per ETSI 300 659-1 para. 6.1.2.b
S81S2#
S90S#
S90Sn#
S93S#
S93Sn#
S94S#
S94Sn#
Use Bell 202 FSK for
CLI delivery
Clear MSN
Save Multiple Subscriber
Number (MSN)
Clear country code
Change country code
Clear channel mapping
Enable channel mapping
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3 = FSK follows line reversal and tone
alert as per ETSI 300 659-1
para. 6.1.2.c and BT SIN227.
Configures modem standard to be used
for CLI delivery.
FSK follows ring burst as per Bellcore
GR-30-CORE and SR-TSV-002476
Clears any saved digits
n = MSN (up to 23 digits)
Country code is set to UK by default
n = country code
0 = UK
1 = Belgium
2 = Rest of Europe
Incoming calls on any channel are
accepted (provided other parameters
are valid eg MSN).
Where n = 1 or 2 for the appropriate
channel.
13
Disabled
n/a
Clear
n/a
UK
n/a
No channel
map
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Configuration
Sequence
S95S#
S95S1#
CMX208
Name
Description
Disable Calling Party No.
transmit
Outgoing call SETUP messages do not
contain any Calling Party Number
Information Elements.
Outgoing call SETUP messages
contain Calling Party Number
Information Element with number set to
saved MSN (if a number is present).
Prevents digits being transmitted to the
POTS port upon call connection.
Upon connection of a call on POTS
port 1 only, if there was a Called Party
Number Information Element present in
the incoming call setup message, the
digits are sent as DTMF tones to the
POTS port.
Once the CMX208 is de-activated it
stays de-activated until the network reactivates it or an outgoing call needs to
be made.
The CMX208 checks to see if the ISDN
line is activated and Layer 2
communications can be made. It then
sets the ILFI pin accordingly.
Resets all of the configuration variables
back to their default values.
Enable Calling Party No.
transmit
S96S#
Disable DDI transmit
S96S1#
Enable DDI transmit
S97S#
Disable line failure
detection
S97S1#
Enable line failure
detection
S9SS1234567890#
Initialise all
configurations.
Default
n/a
Enabled
n/a
Disabled
n/a
Disabled
n/a
Of the above configurations, MSN and Channel Mapping are saved on a per port basis. The rest are
saved on a system-wide basis, the last details entered at either port being the configuration saved.
The extent to which full CLI information is delivered to the POTS port will depend upon the CLI
facilities which have been implemented on the ISDN network.
Once the ‘S’ has been recognised, each digit pressed is then checked for validity as a configuration
sequence. If any digit pressed is not a valid configuration digit, all digits pressed so far will be
transmitted to the network in INFORMATION messages as Keypad Information Elements, until a ‘#’ is
entered (with the exception of ‘S#’ being entered, see Keypad Operation below). If the first four digits
received are a valid configuration sequence then the configuration mode is entered. When a valid
configuration has been completed the CMX208 will send a single DTMF tone to the POTS port. If a
valid configuration sequence is received but subsequent digits are invalid, then subsequent digits
entered will be ignored and two DTMF tones will be sent to the POTS port.
If the port goes on-hook part way through configuration, it will cause any digits received so far to be
ignored. Configurations can be performed consecutively with the exception of the test function (where
the attached handset must be replaced immediately after the configuration has been audibly signalled
to the POTS port). All configurations entered will be retained after a power-down as they are stored in
the external EEPROM.
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1.5.5
CMX208
POTS Operation
1.5.5.1 Keypad Operation
The CMX208 supports ISDN keypad messages for control of Network Supplementary services either
before or during call establishment. When dialling a number (ie off-hook and dial tone audible on
POTS port), or if a call has been disconnected by the network but the POTS port has not yet gone onhook, any keypad string entered will be sent to the network as ‘Keypad Information Elements’ within
INFORMATION messages. Keypad strings are defined as the following sequences of digits, with the
exception of the configuration strings defined in the previous section:
S...#
S#...#
#...#
When a call is connected, pressing the recall key results in all subsequent key presses being sent to
the network as ‘Keypad Information Elements’ within INFORMATION messages, until the handset is
replaced. The tones generated by the key presses are also passed down the B-channel, so the
remote user will be able to hear them.
1.5.5.2 Incoming POTS Calls
An incoming POTS call is identified by the Bearer Capability Information Element of the SETUP
message being set to ‘Speech' or ‘3.1 kHz Audio’. The call will be routed to either (or both) of the
POTS ports which satisfy the following three conditions:
• The port is on-hook.
• The MSN saved for the port matches the Called Number in the incoming SETUP message, or
no MSN is specified for the port, or there is no Called Number in the SETUP message. See
section 1.5.3.5 for details of POTS port MSN selection.
• The ISDN B-channel on which the call is placed (as indicated in the SETUP message) is
compatible with the channel mapping configuration for the port. See section 1.5.3.6 for details
of POTS port channel mapping selection.
When the call is routed to a port, the ringing signal for that port will be applied by means of the
RINGP1 and RINGN1 (or RINGP2 and RINGN2) pins.
The call is answered when either of the ports with ringing signal goes off-hook. The ringing signal is
then stopped and the ISDN call is connected to that port.
1.5.5.3 Outgoing POTS Calls
Outgoing calls are initiated when a POTS port goes off-hook. An ISDN SETUP message is sent to the
network with the Bearer Capability Information Element set to 'Speech'. The dial tone presented by the
network on that ISDN B-channel which was selected by channel mapping (see section 1.5.3.6), will be
routed to the POTS port initiating the call.
When DTMF tones are received from the POTS port, they are sent to the network either as Called
Party Number or Keypad Information Elements. Keypad Information Elements are discussed in
section 1.5.5.1.
Receipt of a valid DTMF tone will prompt its conversion to IA5 coded digits, as shown in the following
table (IA5 hex digits are in brackets). If the first valid digit to be received is a ‘S’ then the configuration
mode is entered and subsequent digits will be monitored and saved as indicated in section 1.5.4.1. If
the first tone received is not a ‘S’ or ‘#’ (see section 1.5.5.1) that digit and all subsequent digits will be
passed to the network in an INFORMATION message as a Called Party Number Information Element.
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Digits received before the network has returned the SETUP ACK message are saved. Upon receipt of
the SETUP ACK any saved digits will be transmitted.
The DTMF tone mapping is as shown below:
Low Group
(Hz)
697
770
852
941
High Group (Hz)
1336
2 (32)
5 (35)
8 (38)
0 (30)
1209
1 (31)
4 (34)
7 (37)
S (2A)
1477
3 (33)
6 (36)
9 (39)
# (23)
1633
A (not used)
B (not used)
C (not used)
D (not used)
Once the network has indicated that the full number has been received, no further digits will be sent to
the network. All tones and announcements from the network (eg ringing, NU, busy etc) and audio (if
the call is connected) will be routed to the POTS port initiating the call, until that port goes on-hook.
1.5.5.4 Connected Calls
Once a call is connected to an analogue port, whether it was incoming or outgoing, a port-specific LED
indicator pin is set high to indicate that the call is connected. See section 1.5.9.1 for details of the
LED indicator pins. Once the call is disconnected, either by receipt of a DISCONNECT message from
the network or an on-hook indication, the ports’ LED indicator pin is set low.
During a call, if a Recall (ie a line break of appropriate length) is received from a POTS port, the
CMX208 will start to look for DTMF tones received on that POTS port. Any tones received will then
be sent to the network in ISDN INFORMATION messages, as Keypad Information Elements.
1.5.5.5 Call Clearing
The call is cleared either by the port going on-hook or by the ISDN network. Note that the ISDN Bchannel which was being used is not released until the POTS port which was in use has gone onhook.
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1.5.6
CMX208
Application Programmer's Interface
Details of this will be supplied to customers under a Non-Disclosure Agreement.
The following Memory Map indicates the main code areas used on the CMX208:
1.5.7
Function
Start Hex Address
End Hex Address
Code Space
External RAM
API area
AMD79C30
ISDN Interface Chip
PSB21525
HDLC Driver Chip
Reserved
000 000
020 000
0C0 000
0F0 000
01F FFF
03F FFF
0EF FFF
0F0 0FF
0F0 100
0F0 1FF
0F0 200
0FF FFF
Hardware Description
1.5.7.1 LED Status Indicators (LED1 to LED9, and ILFI)
LED1 (HK1) is low when analogue port 1 is off-hook, high when on-hook.
LED2 (HK2) is low when analogue port 2 is off-hook, high when on-hook.
LED4 (CN2) is high when analogue port 2 is connected to the ISDN network, low when not connected.
LED8 (AR) is pulsed high and low until the ISDN line is activated, when it remains low constantly.
LED9 (CN1) is high when analogue port 1 is connected to the ISDN network, low when not connected.
ILFI is high when an ISDN Link Failure is Indicated, low when the link is operational.
The functions of the LED and ILFI indicators are set out in the table below:
Pin No.
12
13
15
19
21
54
Designation
LED1
LED2
LED4
LED8
LED9
ILFI
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POTS port 1
Off-Hook
~
~
ISDN Line Activated
Call Connected
ISDN Line Failure
Indicator
17
POTS port 2
~
Off-Hook
Call Connected
ISDN Line Activated
~
ISDN Line Failure
Indicator
D/208/1
ISDN Dual Telephony Protocol Engine
1.6
Application Notes
1.6.1
General
CMX208
The CMX208 is intended for use as part of an ISDN chipset. The CML recommended hardware
implementation contains the following elements (refer to Figure 3):
‘S’ bus interface via RJ45 socket.
RJ11 analogue telephone sockets and analogue circuitry.
ISDN line transformer.
AMD79C30 S-interface controller.
Auxiliary Motorola MC145480 PCM codec.
64K bytes external RAM.
16K Non-volatile memory.
Six processor controlled LED indicator signals.
Figure 3 Application Block Diagram
1.6.2
Approvals
The firmware and finite state machine embedded in the CMX208 have been used in products which
have gained ETSI CTR3 approval.
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1.7
Performance Specification
1.7.1
Electrical Performance
CMX208
1.7.1.1 Absolute Maximum Ratings
Exceeding these maximum ratings can result in damage to the device.
Supply (AVDD - AVSS), (DVDD0 - DVSS0), (DVDD1 - DVSS1)
Voltage on any pin to AVSS, DVSS0 or DVSS1
Current into or out of any VDD or VSS pin
Current into or out of any other pin
S1 Package (QFP)
Total Allowable Power Dissipation at Tamb = 25°C
... Derating
Storage Temperature
Operating Temperature
Min.
-0.3
-0.3
-30
-20
Max.
7.0
VDD + 0.3
+100
+10
Units
V
V
mA
mA
Min.
-55
-40
Max.
1300
17
+125
+85
Units
mW
mW/°C
°C
°C
Min.
2.7
Max.
5.5
Units
V
-40
-100
+85
+100
°C
ppm
1.7.1.2 Operating Limits
Correct operation of the device outside these limits is not implied.
Notes
Supply: (AVDD - AVSS), (DVDD0 - DVSS0),
and (DVDD1 - DVSS1)
Operating Temperature
32 MHz Xtal Frequency Tolerance
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CMX208
1.7.1.3 Operating Characteristics
Details in this section represent design target values and are not currently guaranteed.
For the following conditions unless otherwise specified:
Xtal Frequency = 32MHz ± 100ppm, AVDD = DVDD0 = DVDD1 = 3.0V to 5.0V, Tamb = - 40°C to +85°C.
DC Parameters
IDD (total, operational)
IDD (total in HALT mode)
IDD (total in IDLE mode)
Notes
Min.
Typ.
Max.
Units
1
1
1
−
−
−
25.0
13.0
−
45.0
26.0
12.0
mA
mA
mA
70%
−
-10.0
VDD -1.0
−
−
−
−
−
−
−
−
−
30%
+10.0
−
400
10
VDD
VDD
µA
V
mV
µA
10
10
−
−
31.2468
−
−
−
−
−
125
125
10
10
31.2531
ns
ns
ns
ns
ns
Digital Interface
Input logic "1" level
Input logic "0" level
Input leakage current (Vin = 0 to DVDD)
Output logic "1" level (lOH = -2mA)
Output logic "0" level (lOL = 2mA)
Input or Output leakage current (Vout = VDD)
Xtal/Clock Input
'High' pulse width (tWXH)
'Low' pulse width (tWXL)
Risetime (tXR)
Falltime (tXF)
Period (tCYK)
Notes:
2
2
2
2
2, 3
1. Not including any current drawn by external circuitry.
2. Timing for an external input to the XTAL pin.
3. A fundamental cut crystal is recommended.
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CMX208
1.7.1.3 Operating Characteristics (continued)
Timing Diagrams
Figure 4 External Memory Access Timing
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CMX208
Timing Diagrams (continued)
Figure 5 Bus Hold Timing
Figure 6 Miscellaneous Timing
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CMX208
AC Timing Parameters (continued)
For the following conditions unless otherwise specified:
Xtal Frequency = 32MHz, AVDD = DVDD0 = DVDD1 = 3.0V to 5.0V, Tamb = - 40°C to +85°C.
Read/Write operation (1/2)
Parameter
Symbol
Conditions
Address setup time
tSAST
VDD = +5.0V ± 10%
ASTB high-level width
tWSTH
VDD = +5.0 V ± 10%
Address hold time to (ASTB↓)
tHSTLA
VDD - +5.0 V ± 10%
Address hold time (to RD↑ )
Delay from address to RD↓
tHRA
tDAR
VDD = +5.0V ±10%
Address float time (to RD↓)
Delay from address to data input
tFRA
tDAID
VDD = +5.0V ±10%
Delay from ASTB↓ to data input
tDSTID
VDD = +5.0V ± 10%
Delay from RD↓ to data input
tDRID
VDD = +5.0 V ± 10%
Delay from ASTB↓ to RD↓
Data hold time (to RD↑)
Delay from RD↑to address active
tDSTR
tHRID
tDRA
VDD = +5.0 V ± 10%
After program is read
After program is read
VDD = +5.0 V ± 10%
After data is read
After data is read
Delay from RD↑ to ASTB↑
RD low-level width
tDRST
tWRL
VDD = 5.0 V ± 10%
Address hold time (to WR↑)
Delay from address to WR↓
tHWA
tDAW
VDD = +5.0V ± 10%
Delay from ASTB↓ to data output
tDSTOD
VDD = +5.0V ± 10%
Delay from WR↓ to data output
Delay from ASTB↓ to WR↓
tDWOD
tDSTW
Where:
Min.
Max.
Units
(0.5 + a) T - 15
(0.5 + a) T - 31
(0.5 + a) T - 17
(0.5 + a) T - 40
0.5T - 24
0.5T - 34
0.5T - 14
(1 + a) T - 9
(1 + a) T - 15
−
−
−
−
−
−
−
0.5T - 9
0
−
−
−
−
−
−
−
−
−
0
(2.5 + a + n) T - 37
(2.5 + a + n) T - 52
(2 + n) T - 40
(2 + n) T - 60
(1.5 + n) T - 50
(1.5 + n) T - 70
−
−
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
0.5T - 8
−
ns
0.5T - 12
−
ns
1.5T - 8
−
ns
1.5T - 12
0.5T - 17
(1.5 + n) T - 30
(1.5 + n) T - 40
0.5T - 14
(1 + a) T - 5
(1 + a) T - 15
−
−
−
0.5T - 9
−
−
−
−
−
−
−
0.5T + 19
0.5T + 35
0.5T - 11
−
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
T = tCYK (system clock cycle time)
a = 1 (during address wait), otherwise, 0
n = Number of wait states (n = 2)
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Read/Write operation (2/2)
Parameter
Symbol
Conditions
Data setup time (to WR↑)
tSODW
VDD = +5.0 V ± 10%
Data hold time (to WR↑)Note 1
tHWOD
VDD = +5.0V ± 10%
Delay from WR↑ to ASTB↑
WR low-level width
tDWST
tWWL
VDD = +5.0V ± 10%
Min.
(1.5 + n) T - 30
(1.5 + n) T - 40
0.5T - 5
0.5T - 25
0.5T - 12
(1.5 + n) T - 30
(1.5 + n) T - 40
Max.
−
−
−
−
−
−
−
Units
ns
ns
ns
ns
ns
ns
ns
Note 1: Hold time includes the time during which VOH1 and VOL1 are held under the load conditions of CL = 50 pF and RL = 4.7 kΩ.
Bus Hold timing
Parameter
Symbol
Conditions
Delay from WAITN↑ to float
Delay from WAITN↑ to STN↑
tDHQHHAH VDD = +5.0 V ± 10%
Delay from float to STN↑
Delay from WAITN↑ to STN↓
tDCFHA
tDHQLHAL
VDD = +5.0 V ± 10%
tDHAC
VDD = +5.0 V ± 10%
Delay from STN↓ to active
tFHQC
Min.
−
−
−
−
−
−
1T - 20
1T - 30
Max.
(6 + a + n) T + 50
(7 + a + n) T + 30
(7 + a + n) T + 40
1T + 30
2T + 40
2T + 60
−
−
Units
ns
ns
ns
ns
ns
ns
ns
ns
Miscellaneous timing
Parameter
Symbol
Conditions
Min.
Max.
nT
0.5 tCYCL- 10
0.5 tCYCL- 20
0.5 tCYCL- 10
0.5 tCYCL- 20
−
−
−
−
−
−
−
−
−
10
20
10
20
ns
ns
tWNIL
tWNIH
10
10
−
−
µs
µs
tWRSL
tWRSH
10
10
−
−
µs
µs
ASTB cycle time
ASTB low-level width
tCYCL
tCLL
VDD = +5.0 V ± 10%
ASTB high-level width
tCLH
VDD = +5.0 V ± 10%
ASTB rise time
tCLR
VDD = +5.0 V ± 10%
ASTB fall time
tCLF
VDD = +5.0 V ± 10%
NMI low-level width
NMI high-level width
RSTN low-level width
RSTN high-level width
Where:
Units
ns
ns
ns
ns
T = tCYK (system clock cycle time)
a = 1 (during address wait), otherwise, 0.
n = Number of wait states (n = 2).
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1.7.2
CMX208
Packaging
Figure 7 QFP Mechanical Outline: Order as part no. CMX208S1
Handling precautions: This product includes input protection, however, precautions should be taken to prevent device damage from
electro-static discharge. CML does not assume any responsibility for the use of any circuitry described. No IPR or circuit patent
licences are implied. CML reserves the right at any time without notice to change the said circuitry and this product specification. CML
has a policy of testing every product shipped using calibrated test equipment to ensure compliance with this product specification.
Specific testing of all circuit parameters is not necessarily performed.
Oval Park - LANGFORD
MALDON - ESSEX
CM9 6WG - ENGLAND
Telephone: +44 (0)1621 875500
Telefax:
+44 (0)1621 875600
e-mail:
sales@cmlmicro.co.uk
http://www.cmlmicro.co.uk