CX28332 Conexant Systems, CX28332 Datasheet - Page 43

• Manufacturer Part Number: CX28332
• Description: (CX28331 - CX28333) Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit
• Manufacturer: Conexant Systems

CX28331/CX28332/CX28333
Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit
2.3.4 The PLL Clock Recovery Circuit
2.3.5 Loss Of Signal (LOS) Detector
2.3.6 B3ZS/HDB3 Decoder With Bipolar Violation Detector
100985A
The clock recovery circuit (RX PLL) extracts the embedded clock from the sliced
data and provides this clock and the retimed data to the decoder (data mode).
Upon startup (after the internal reset is deasserted), the RX PLL uses a reference
clock (REFCLK, running at the symbol rate) and a phase-frequency detector to
lock to the correct data rate (reference mode). During reference mode, the data
outputs are squelched (set to 0). The RX PLL is kept in reference mode until a
valid input is detected.
The Receive Loss Of Signal (RLOS) is a digital function which monitors the
retimed data from the clock recovery block. The AMI data is checked for a
continuous run of zeroes. When a continuous run of 128 ± 1 consecutive zeroes
occurs, the RLOS signal is asserted. After the RLOS signal is asserted, a 1s count
is made on every block of 128 AMI symbols. The RLOS signal is deasserted
when the 1s count within a block of 128 symbols is at least:
detector is not affected by the state of remote or local looping.
In the CX2833i device, when ENDECDIS = 0 (encoder/decoder enabled), the
decoder takes the output from the clock recovery circuit and decodes the data
(HDB3 or B3ZS) into a single retimed NRZ data signal. The data signal is then
sent out of the CX2833i over the RNRZ (RPOS) pin. Any detected Line Code
Violations (LCV) are sent out over the corresponding RLCV (RNEG) pin. The
RLCV pin is asserted for one symbol period at the time the violation appears on
the RX output pin (RNRZ).
in bold text. A valid bipolar pulse is indicated by a B. A bipolar violation
(non-alternating positive or negative) pulse is indicated by a V .
a bipolar violation as a B. A coding violation or a valid 0 substitution resets the
counter.
B3ZS: Minimum 1s density = 39 ± 1 count out of 128 (~30.5%)
HDB3: Minimum 1s density = 29 ± 1 count out of 128 (~22.7%)
The RLOS detector will always monitor the cable-side RX inputs. The
The following shows data sequence criteria for LCV; violations are indicated
• Excessive zeros: 0, 0, 0, 0 (HDB3) or 0, 0, 0 (B3ZS). These violations are
• Bipolar violation: B, 0, V (i.e., +1, 0, +1 or -1, 0, -1 for HDB3) B, V
• Coding violation: 0, 0, V (HDB3) or 0, V (B3ZS) with an even number of
The even/odd counter (used to count the number of Bs between Vs) will count
passed on as 0 data on the RNRZ pin.
(B3ZS and HDB3). These violations are passed on as 1 data on the RNRZ
pin.
Bs since the last valid 0 substitution V (follows coding rule). These
violations are passed on as 0 data on the RNRZ pin.
Conexant
2.0 Functional Description
2.3 Receiver
2-11