CX28344 Conexant, CX28344 Datasheet - Page 81

• Manufacturer Part Number: CX28344
• Description: (CX2834x) Dual / Triple / Quad / Hex / Octal - Enhanced DS3 / E3 Framer
• Manufacturer: Conexant

CX28342/3/4/6/8 Data Sheet
2.2
2.2.1
Figure 2-14. Receiver Line Side Inputs
28348-DSH-001-B
LINECK
RXNEG
RXPOS
Receiver Operation
Line-Side Interface
This section describes the receiver operation of the CX28342/3/4/6/8 device.
The line-side receive interface of CX28342/3/4/6/8 consists of four input signals:
The line-side interface can be placed in one of three different modes by setting the
NRZMod and RxAMI fields of the Feature1 Control register.
modes.
Table 2-7. Line-side Interface Modes
The data stream is sampled from the data (RXPOS and RXNEG, or RXNRZ and
LCVI) pins on either the rising or the falling edge of LINECK (based on the value in
the LRxCkRis field of the Feature5 Control register). The data should be one full
clock period wide.
clock assuming data is sampled on the rising edge of the clock.
The CX28342/3/4/6/8 decoder converts the bipolar signal to a unipolar stream based
on AMI/B3ZS/HDB3 line code and detects LCV, if any. The decoder is bypassed in
NRZ (unipolar) mode.
Rail
AMI
Unipolar
LINECK—Raw clock derived from incoming data (44.736/34.368 MHz)
RXCKI—Dejittered version of LINECK
RXPOS/RXNRZ—In rail/AMI-mode, carry positive polarity data. In
unipolar-mode, carry NRZ data
RXNEG/LCVI—In rail/AMI-mode, carry negative polarity data. In
unipolar-mode, report an LCV (or tied to ground)
Mode
Mindspeed Technologies™
Figure 2-14
2 data pins, B3ZS line code for DS3, HDB3 line code for E3
2 data pins, AMI line code
1 data pin, NRZ line code
illustrates the relation between data (100100110) and
Description
Table 2-7
Functional Description
describes the
100542_017
2
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35