
XRT7245
DS3 UNI FOR ATM
á
PRELIMINARY
REV. 1.03
XX
207
Figure 56. Illustration of AMI Line Code ........................................................................................208
Figure 57. Illustration of two examples of B3ZS Encoding .............................................................209
Figure 58. Waveform/Timing Relationship between TxLineClk, TxPOS and TxNEG—TxPOS and
TxNEG are configured to be updated on the falling edge of TxLineClk. ........................................211
Figure 59. Waveform/Timing Relationship between TxLineClk, TxPOS and TxNEG—TxPOS and
TxNEG are configured to be updated on the falling edge of TxLineClk. ........................................211
Figure 60. Block Diagram of the Receiver DS3 Framer, with associated pins. ...............................215
Figure 61. Functional Block Diagram of Receiver Framer ..............................................................216
Figure 62. Behavior of the RxPOS, RxNEG and RxLineClk signals during data reception of
Unipolar Data ...................................................................................................................................217
Figure 63. Illustration on how the Receive DS3 Framer interfaces to the Line Interface Unit, while the
UNI is operating in Bipolar Mode. ...................................................................................................218
Figure 64. Illustration of AMI Line Code ........................................................................................219
Figure 65. Illustration of two examples of B3ZS Decoding ............................................................219
Figure 66. Waveform/Timing Relationship between RxLineClk, RxPOS and RxNEG—When RxPOS
and RxNEG are to be sampled on the rising edge of RxLineClk .....................................................221
Figure 67. Waveform/Timing Relationship between RxLineClk, RxPOS and RxNEG—When RxPOS
and RxNEG are to be sampled on the falling edge of RxLineClk ...................................................221
Figure 68. The State Machine Diagram for the Receive DS3 Framer’s “Frame Acquisition/
Maintenance” Algorithm ..................................................................................................................222
Figure 69. Flow Diagram depicting how the Receive FEAC Processor Functions. ........................231
Figure 70. Flow Chart depicting the Functionality of the LAPD Receiver .....................................234
Figure 71. Illustration of the RxOH Serial Output Port Signals ......................................................235
Figure 72. Illustration of the Simple Block Diagram of the Receive PLCP Processor ....................239
Figure 73. Functional Block Diagram of the Receive PLCP Processor Block ................................240
Figure 74. State Machine Diagram of the Receive PLCP Processor Framing Algorithm ...............241
Figure 75. Timing Relationship between the Receive PLCP POH Byte Serial Output Port pins—Rx-
POH, RxPOHFrame and RxPOHClk. ..............................................................................................247
Figure 76. Simple Illustration of the Receive Cell Processor, with associated Pins ........................249
Figure 77. Functional Block Diagram of the Receive Cell Processor ..............................................250
Figure 78. Cell Delineation Algorithm Employed by the Receive Cell Processor, when the UNI is op-
erating in the “Direct-Mapped” ATM Mode. ...................................................................................251
Figure 79. Illustration of Overall Cell Filtering/Processing proceduring the occurs within the Receive
Cell Processor ...................................................................................................................................253
Figure 80. State Machine Diagram of the HEC Byte Error Correction/Detection Algorithm .........254
Figure 81. An Approach to Processing Segment OAM cells, via the Receive Cell Processor. .......265
Figure 82. Approach to Processing “End-to-End” OAM Cells ........................................................265
Figure 83. Illustration of the Behavior of the RxGFC Serial Output Port signals ...........................268
Figure 84. Simple Block Diagram of Receive UTOPIA Block of UNI. ..........................................269
Figure 85. Functional Block Diagram of the Receive UTOPIA Interface Block ............................271
Figure 86. Timing Diagram of RxClav/RxEmptyB and various other signals during reads from the Re-
ceive UTOPIA, while operating in the Octet-Level Handshaking Mode. .......................................275
Figure 87. Timing Diagram of various Receive UTOPIA Interface block signals, when the Receive
UTOPIA Interface block is operating in the “Cell Level” Handshake Mode ..................................276
Figure 88. Simple Illustration of Single-PHY Operation .................................................................279