DS3163 Maxim Integrated Products, DS3163 Datasheet - Page 188
DS3163
Manufacturer Part Number
DS3163
Description
IC TRPL ATM/PACKET PHY 400-PBGA
Manufacturer
Maxim Integrated Products
Datasheet
1.DS3163.pdf
(384 pages)
Specifications of DS3163
Applications
*
Mounting Type
Surface Mount
Package / Case
400-BGA
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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10.14.4 Transmit Line Interface
The Transmit Line Interface accepts a bipolar data stream from the B3ZS/HDB3 Encoder, performs error insertion,
and transmits the bipolar data stream.
Error insertion inserts BPV or EXZ errors into the bipolar signal. When a BPV error is to be inserted, the Transmit
Line Interface waits for the next occurrence of three consecutive ones. The first bipolar one is generated according
to the normal AMI rules. The second bipolar one is generated by transmitting the same values on TPOS and TNEG
as the values for the first one. The third bipolar one is generated according to the normal AMI rules. When an EXZ
error is to be inserted, the Transmit Line Interface waits for the next occurrence of three (four) consecutive zeros on
the bipolar signal, and inhibits the insertion of a B3ZS (HDB3) signature. There must be at least one intervening
one between consecutive BPV or EXZ errors. A single BPV or EXZ error inserted must be detected as a single
BPV/EXZ error at the far-end, and not cause any other type of error to be detected. For example, if a BPV error is
inserted, the far-end should not also detect a data error. If a second error insertion request of a given type (BPV or
EXZ) is initiated before a previous request has been completed, the second request will be ignored.
The outgoing bipolar data stream consists of positive pulse data (TPOSn) and negative pulse data (TNEGn).
TPOSn and TNEGn are updated on the rising edge of TLCLKn.
10.14.5 Receive Line Interface
The Receive Line Interface receives a bipolar signal. The incoming bipolar data line consists of positive pulse data
(RPOSn), negative pulse data (RNEGn), and clock (RLCLKn) signals. RPOSn and RNEGn are sampled on the
rising edge of RLCLKn. The incoming bipolar signal is checked for a Loss Of Signal (LOS) condition, and passed
on to B3ZS/HDB3 Decoder. An LOS condition is declared if both RPOSn and RNEGn do not have any transitions
for 192 clock cycles. The LOS condition is terminated after 192 clock cycles without any EXZ errors. Note: When
zero suppression (B3ZS or HDB3) decoding is disabled, the LOS condition is cleared, and cannot be detected.
10.14.6 B3ZS/HDB3 Decoder
The B3ZS/HDB3 Decoder receives a bipolar signal from the RPOSn/RNEGn pins. The incoming bipolar signal is
checked for a Loss of Signal (LOS) condition. An LOS condition is declared if both the positive pulse data and
negative pulse data signals do not have any transitions for 192 clock cycles. The LOS condition is terminated after
192 clock cycles without any EXZ errors.
B3ZS/HDB3 Decoder performs EXZ detection, zero suppression decoding, BPV detection, and bipolar to unipolar
conversion.
EXZ detection checks the bipolar data stream for excessive zeros (EXZ) errors. In B3ZS mode, an EXZ error is
declared whenever there is an occurrence of 3 or more zeros. In HDB3 mode, an EXZ error is declared whenever
there is an occurrence of 4 or more zeros. EXZ errors are accumulated in the EXZ counter (LINE.REXZCR
register).
Zero suppression decoding converts B3ZS or HDB3 encoded bipolar data into an AMI bipolar signal. In B3ZS
mode, the encoded bipolar signal is checked for a B3ZS signature. If a B3ZS signature is found, it is replaced with
three zeros. In HDB3 mode, the encoded bipolar signal is checked for an HDB3 signature. If an HDB3 signature is
found, it is replaced with four zeros. The format of both an HDB3 signature and a B3ZS signature is programmable.
When LINE.RCR.REZSF = 0, the decoder will search for a zero followed by a BPV in B3ZS mode, and in HDB3
mode it will search for two zeros followed by a BPV. If LINE.RCR.REZSF = 1, the same criteria is applied with an
additional requirement that the BPV must be the opposite polarity of the previous BPV. Refer to
Figure 10-50
and
Figure
10-51. Zero suppression decoding is also programmable (on or off). Note: Immediately after a reset or a
LOS condition, the first B3ZS/HDB3 signature to be detected will not depend upon the polarity of any BPV
contained within the signature.
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