MT9076
Preliminary Information
Bit
Name
Functional Description
7
6
5
T1/E1
- -
E1 mode selection. when this bit is one, the device is in E1 mode.
Reserved. Must be kept at 0 for normal operation.
TxEN
Transmit Enable. Setting this bit low turns off the TTIP and TRING output line drivers.
Setting this bit high enables them.
4
LIUEn
LIU Enable.Setting this bit low enables the internal LIU front-end. Setting this pin high
disables the LIU. Digital inputs RXA and RXB are sampled by the rising edge of E2.0i (Exclk)
to strobe in the received line data. Digital transmit data is clocked out of pins TXA and TXB
with the rising edge of C2.0o
3
2
ELOS
ELOS Enable. Set this bit low to set the analog loss of signal threshold to 40 dB below
nominal. Set this bit high to set the analog loss of signal threshold to 20 dB below nominal.
Tx8KEN
Transmit 8 KHz Enable. If one, the pin RxMF/TxFP transmits a positive 8 KHz frame pulse
synchronous with the serial data stream transmit on TXA/TXB. If zero, the pin RxMF/TxFP
transmits a negative frame pulse synchronous with the multiframe boundary of data coming
out of DSTo.
1
0
ADSEQ
- -
Digital Milliwatt or Digital Test Sequence. If one, the A-law digital milliwatt analog test
sequence will be selected by the Per Time Slot Control bits TTST and RTST.If zero, a PRBS
generator / detector will be connected to channels with TTST, RRST respectively
Reserved. Set this bit low for normal operation.
Table 104 - Configuration Control Word
(Page 2, Address 10H) (E1)
Bit
Name
Functional Description
7
WR
Winding Ratio. Set this pin low if a 1:2.4 transformer is used on the transmit side. Set this
pin high if a 1:2 transformer is used.
6-4
3
- -
Reserved. Must be kept at 0 for normal operation.
CPL
Custom Pulse Level. Setting this bit low enables the internal ROM values in generating the
transmit pulses. The ROM is coded for different line terminations or build out, as specified in
the LIU Control word. Setting this pin high disables the pre-programmed pulse templates.
Each of the 4 phases that generate a mark derive their D/A coefficients from the values
programmed in the CPW registers.
2 - 0
TX2-0
Transmit pulse amplitude. Select the TX2 –TX0 bits according to the line type, value of
termination resistors (RT), and transformer turns ratio used
TX2 TX1 TX0 Line Impedance(ohms) RT(ohms)
Transformer Ratio
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
120
120
0
1:2
1:1
1:2
1:2
1:2
1:1
1:2
1:2
0
120
15
12.1
0
120/75
75
75
0
75
9.1
12.1
75/120
After reset these bits are zero.
Table 105 - LIU Tx Word
(Page 2, Address 11H) (E1)
104
MITEL [ MITEL NETWORKS CORPORATION ]
