CMX625D5 CML Microcircuits, CMX625D5 Datasheet - Page 12

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

ISDN TA POTS Interface
The transmitter is able to abort a transmission by holding MX inactive (high) for two or more frames, this
will generate an interrupt when the INTERRUPT MASK Register bit 3 is unmasked (logic ‘1’) and bit 3 of
Figure 6 shows the monitor channel handshake procedure.
Figure 7 shows the maximum speed case for monitor handshake timing.
designed for a higher data throughput than is provided by the general case.
deactivate (high) MX and transmit new data one frame after MR is deactivated.
transmitter is anticipating that MR will be reactivated one frame after it is deactivated, minimising the
delay between bytes. MR being held inactive (high) for two or more frames indicates an abort is being
signalled by the receiver.
The abort is a signal from the receiver to the transmitter indicating that data has been missed. The
receiver is able to abort a transmission by holding MR inactive (high) for two or more frames in response
to MX going active. An abort from the receiver will generate an interrupt when the INTERRUPT MASK
Register bit 2 is unmasked (logic ‘1’) and bit 2 of the Status Register will be set to ‘1’. Figure 8 shows a
monitor abort request from the receiver.
2000 Consumer Microcircuits Limited
Figure 7 Monitor Handshake Timing (maximum speed case)
Figure 6 Monitor Channel Handshake Procedure
Data
MX
MR
MX = Monitor Transmit Bit, active low.
MR = Monitor Receive Bit, active high.
MD = Monitor Data
Byte 1
ACK
Byte 2
12
ACK
Byte 3
ACK
Byte n
ACK
EOM
The transmitter can be
The transmitter can
In this way, the
CMX625
D/625/1