CN8380EPF CONEXANT [Conexant Systems, Inc], CN8380EPF Datasheet - Page 64

• Manufacturer Part Number: CN8380EPF
• Description: integrated quad line interface unit unit for both 1.544 Mbps (T1) and 2.048 Mbps (E1) applications
• Manufacturer: CONEXANT [Conexant Systems, Inc]

3.0 Registers
3.3 Per Channel Registers
SQUELCH
ALT_TR
TERM
PDN
T_BOOST
PPT
3-12
12, 22, 32, 42 —Transmitter Configuration (TLIU_CR)
ALT_TR
7
Enable Receive Signal Squelch
zero when RALOS is declared. SQUELCH is useful in attached framer applications to allow
the framer to detect LOS during an RALOS condition.
Alternate Transformer Select
transmitter transformer turns ratios. Normally, a turns ratio of 1:2 for the transmitter is used.
An alternate transformer with turns ratio of 1:1.36 can be selected to minimize power
dissipation
Transmitter Termination Select
compensate for the presence of an optional external termination resistor. The external resistor
is placed in parallel across XTIP/XRING on systems that must meet transmitter return loss
requirements. Refer to
Refer to
Power Down
dissipation. In low power mode, XTIP/XRING, RPOSO/RNEGO, and RCKO outputs are
three-stated. All other receiver functions are not affected.
Transmit Level Boost
added to the output by surge protection circuitry. Typical resistance values are 5.6 ohms in
series with line side XTIP and XRING signals.
Programmed Pulse Template
pulse shape stored in the corresponding shape register, SHAPEn [addr n8 – nF], is used for
transmission.
TERM
0 = Normal
1 = Squelch RPOSO/RNEGO outputs upon RALOS detect
0 = Normal transformer (1:2)
1 = Alternate transformer (1:1.36)
0 = no external transmit termination resistor used
1 = external transmit termination resistor used
0 = Channel is disabled, low power mode
1 = Channel is enabled, normal operation
0 = No compensation
1 = Compensation enabled
0 = Pulse template selected by PULSE(2:0)
1 = Programmed pulse template selected
6
Tables 2-4
—
Unused channels can be put into a low power mode in order to minimize power
PDN
5
through
—
Figure 2-7, Transmit Termination
Adjusts the transmit output level to compensate for series resistance
T_BOOST
2-8
Advance Information
—
—
Enables custom transmit pulse transmission. The programmed
—
—
4
Adjusts the transmit output level for one of two possible
for return loss values.
Conexant
The digital receiver outputs, RPOSO/RNEGO, are forced to
Adjusts the transmit XTIP/XRING output amplitude to
PPT
3
PULSE[2]
Components, for resistor placement.
2
Quad T1/E1 Line Interface
PULSE[1]
1
N8380DSA
PULSE[0]
CN8380
4/21/99
0
R/W