CMX625D5 CML Microcircuits, CMX625D5 Datasheet - Page 21

• Manufacturer Part Number: CMX625D5
• Description: ISDN TA POTS Interface
• Manufacturer: CML Microcircuits

ISDN TA POTS Interface
1.5.15 Programming the CMX625
The CMX625 is programmed via the ‘MON1’ (Monitor Channel 1) channel in TE mode and the ‘Monitor’
channel in non-TE mode. The programming sequence consists of 3 consecutive Monitor bytes: the IOM-
2 address, the CMX625 command and data byte. Before executing a command, the CMX625 compares
the received IOM-2 address byte with its own address. The MSB of the IOM-2 address is always a ‘1’
(see section 1.5.2). A logical ‘1’ in the MSB of the CMX625 command represents a write operation and a
logical ‘0’ represents a read operation.
Structure for Register read/write operations:
Example 1: Program the CMX625 to generate interrupt requests for DTMF RX Status Change on bit 5 of
C/I channel, i.e. C/I1 Channel Output Control Code (2-0)=110. Set IOM-2 address to SA2-SA0=010 and
device select, DS=1.
If the command is a register read then only the address and command bytes are sent. The CMX625 will
respond with an IOM-2 Register address byte followed by the read data. The IOM-2 Register address
byte consists of the Register address that is being read in the least significant 4 bits and the IOM-2
address (less the device select bit) in the most significant 4 bits.
Command
(DD)
Register
MX
1
0
0
1
0
1
0
1
1
0
0
1
0
1
0
1
1
1
2000 Consumer Microcircuits Limited
IOM
(DU)
MR
1
1
0
0
1
0
1
0
1
1
0
0
1
0
1
0
1
1
0=Read
1=Write
(hex)
FF
A8
A8
FF
FF
A8
A8
FF
FF
FF
DD
88
88
06
06
89
89
20
20
R/W
(DU)
MX
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
(DD)
MR
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
(hex)
FF
FF
FF
FF
FF
FF
FF
FF
FF
FF
FF
FF
FF
FF
FF
FF
FF
FF
DU
X
Monitor Channel Idle State
Transmit IOM-2 Address
Acknowledge Address
Transmit Command (Write IOM-2 Control, $8)
Acknowledge Command/ Transmit IOM-2 Control Data
Acknowledge Data
End of Transmission
Transmit IOM-2 Address
Acknowledge Address
Transmit Command (Write Mask Register, $9)
Acknowledge Command/ Transmit IOM-2 Control Data
Acknowledge Data
End of Transmission
Idle
21
X
Register
Address
A3
Comment
Register
Address
A2
Register
Address
A1
Register
Address
CMX625
D/625/1
A0