CN8380EPF CONEXANT [Conexant Systems, Inc], CN8380EPF Datasheet - Page 63

• 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]

CN8380
Quad T1/E1 Line Interface
UNIPOLAR
ZCS
CLK_POL
RAWMD
EQ_DIS
ATTN
N8380DSA
4/21/99
11, 21, 31, 41—Receiver Configuration (RLIU_CR)
UNIPOLAR
7
Unipolar Mode
signals.
encoded received data is decoded and output on RDATO in unipolar, NRZ format; and BPV
indicates that the currently received bit is a bipolar violation. TPOSI is replaced with TDATI
and accepts unipolar, NRZ formatted transmit data. TNEGI is not used in this mode. In
unipolar mode, ZCS can replace AMI encoding. Refer to the ZCS bit description below.
where a high level on RPOSO indicates receipt of a positive AMI pulse, and a high level on
RNEGO indicates receipt of a negative AMI pulse on RTIP/RING inputs. TPOSI/TNEGI
inputs accept bipolar dual-rail transmit data, where a high on TPOSI causes a positive output
pulse on XTIP/XRING, and a high on TNEGI causes a negative output pulse.
Zero Code Suppression Enable
encoding/decoding on digital transmit and receive signals and is only applicable if unipolar
mode is selected. In T1 mode (T1/E1 = 1) [addr n0], B8ZS encoding/decoding is selected. In
E1 mode (T1/E1 = 0), HDB3 encoding/decoding is selected.
recoverable code. In the receive direction, the ZCS decoder replaces received codes with eight
0s in T1 mode, or four 0s in E1 mode. The B8ZS code is 000VB0VB and the HDB3 code is
X00V; where B is a normal AMI pulse, V is a bipolar violation, and X is a “don't-care.” These
are standard T1 and E1 line code options.
Clock Polarity
output on the rising edge of RCKO. If CLK_POL is set to 1, RPOSO/RNEGO is output on the
falling edge of RCKO.
Raw Receive Mode
RCKO is replaced by the logical OR of RPOSO/RNEGO. A high on RPOSO indicates a
positive pulse, and a high on RNEGO indicates a negative pulse on RTIP/RRING line inputs.
Equalizer Disable
Bridge Attenuation
of bridge resistors in series with the normal receive termination resistance. Also, in this mode a
lower threshold for RALOS is selected to compensate for the 20 db attenuation.
ZCS
In unipolar mode, RPOSO/RNEGO signals are replaced by RDATO/BPV signals. AMI
In bipolar mode, RPOSO/RNEGO signals output received data in bipolar dual-rail format,
0 = Digital transmit/receive signals are bipolar, dual-rail
1 = Digital transmit/receive signals are unipolar, NRZ
In the transmit direction, the ZCS encoder replaces sequences of eight or four 0s with a
0 = ZCS encode/decode disabled
1 = ZCS encode/decode enabled
0 = Data out on rising RCKO
1 = Data out on falling RCKO
0 = Normal receiver output
1 = Slicer data output enabled
0 = Equalizer enabled
1 = Equalizer disabled
0 = Normal receiver input levels
1 = 20 dB compensation enabled
6
CLK_POL
—
—
Selects the digital receive data clocking edge. Normally, RPOSO/RNEGO is
5
Selects between unipolar and bipolar modes for digital transmit and receive
—
—
—
Disables the receiver equalizer. (Test mode only)
Compensates for 20 dB resistive signal attenuation caused by placement
RPOSO/RNEGO data outputs are replaced by the data slicer output, and
Advance Information
RAWMD
—
4
Conexant
Enables HDB3 or B8ZS zero code suppression
EQ_DIS
3
ATTN
2
3.3 Per Channel Registers
—
1
3.0 Registers
SQUELCH
0
3-11
R/W