
ISDN Data and Telephony Protocol Engine (no X.25)
CMX218
1999
 Consumer Microcircuits Limited
1999
 Chiron Technology Limited
7
D/218/1
S1 Package
80QFP
Signal
Description
Pin No.
Name
Type
58
CLIP1
O/P
POTS Port  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  Hook Switch Status Detector
(on-hook = low)
60
~
I/P
For manufacturers’ use only.  Connect to DV
SS 
directly
CMX605 C-BUS Interface - Reply Data
61
REPLY
I/P
62
CMD-
DATA
O/P
CMX605 C-BUS Interface - Command Data
63
SER-CLK
O/P
CMX605 C-BUS Interface - Serial Clock
64
AV
DD
Power
The positive analogue supply rail.  Levels and voltages
are dependent upon this supply.  This pin should be
decoupled to AV
SS 
by a capacitor
65
AV
REF1
Power
A/D Reference Voltage.  Connect to AV
DD
 directly
66
AV
SS
CSN1
Power
The negative analogue supply rail (ground)
67
O/P
CMX605 C-BUS Interface (chip select for POTS Port)
68
N/C
O/P
Do not make any connection to this pin
69
AV
REF2
Power
D/A Reference Voltage.  Connect to AV
DD
 directly
70
AV
REF3
NMI
Power
D/A Reference Voltage.  Connect to AV
SS
 directly
For manufacturer's use only. Connect to DV
SS
 directly
API Interrupt (inactive = high)
71
I/P
72
API-INT
I/P
73
IRQN
I/P
CMX605 C-BUS Interface - Interrupt (inactive = high)
74
PSBINT
I/P
HDLC Chip Interrupt
75
RXD1
I/P
RS232 Port 1 Received Data - used for autobauding
76
RTS1
I/P
RS232 Port 1 Ready To Send (inactive = high)
77
ISDNINT
I/P
ISDN S-interface Chip Interrupt
78
DTR1
I/P
RS232 Port 1 Data Terminal Ready (inactive = high)
79
RXD1
I/P
RS232 Port 1 Received Data (inactive = high)
80
TXD1
O/P
RS232 Port 1 Transmitted Data (high when inactive)
Notes:
I/P
O/P
BI
=
=
=
Input
Output
Bidirectional