MT90812 Mitel Networks Corporation, MT90812 Datasheet - Page 41

• Manufacturer Part Number: MT90812
• Description: Integrated Digital Switch (IDX)
• Manufacturer: Mitel Networks Corporation

Advance Information
13.3
The TX circuit performs the following functions:
•
•
•
•
These functions will be described in the sections below.
13.3.1
The HDLC transmitter is controlled by the MT90812 generated Transmit Clock Enable signal, TxCEN. The
TxCEN output signal enables the HDLC transmitter in the appropriate channel as specified by the system, via
generate TxCEN to enable the HDLC transmitter.
handle Transmit Packet Termination.
allow RX and TX Handshaking
merge D-Channel data from the HDLC controller into the local TDM stream.
TX Control
Generation of TxCEN
processor
Micro
MRDY
R/W
IRQ
D0
D7
A0
A9
E
Figure 24 - Typical Application Using the HDLC Resource Allocator
A0-A9
D0-D7
CS
R/W
IRQ
TxCEN
A0
A3
D0
D7
CS
R/W
E
IRQ
C2i
MCLKo MCLKi
MT8952B
TEOP
20.48 MHz
Crystal
F0i
Clock
IDX
RxCEN
TxCEN
CDSTo
CDSTi
REOP
TEOP
C
RxCEN
D
DPER
REOP
F4o
STo0
C10o
STo1
STi1
STi0
C2o
C4o
5
1
2
3
4
DSTi
CDSTi
DSTo
CDSTo
DSTi
CDSTi
DSTo
CDSTo
DSTi
CDSTi
DSTo
CDSTo
C10i
C10i
C10i
C4i
C4i
C4i
Interface
Interface
Interface
DNIC
DNIC
DNIC
F0i
F0o
F0i
F0o
F0i
F0o
MT90812
LOUT
LOUT
LOUT
LIN
LIN
LIN
T
R
T
R
T
R
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