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XRT72L13IQ Datasheet(PDF) 10 Page - Exar Corporation |
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XRT72L13IQ Datasheet(HTML) 10 Page - Exar Corporation |
10 / 370 page XRT72L13 áç áç áç áç M13 MULTIPLEXER/CLEAR CHANNEL DS3 FRAMER IC REV. P1.0.6 PRELIMINARY VIII OPERATING MODE REGISTER (ADDRESS = 0X00) ...................................................................................... 247 Figure 73. Illustration of the "Terminal Equipment" being interfaced to the "Transmit Payload Data Input Interface" block (of the XRT72L13) for Mode 6 (Nibble-Parallel/Local-Timed/Frame- Master) Operation ................................................................................................................ 249 Figure 74. Behavior of the "Terminal Interface" signals between the XRT72L13 and the Terminal Equipment (DS3 Mode 6 Operation) .................................................................................. 250 OPERATING MODE REGISTER (ADDRESS = 0X00) ...................................................................................... 250 4.2.2 The Transmit Overhead Data Input Interface ..................................................................................... 250 Figure 75. Simple Illustration of the "Transmit Overhead Data Input Interface" block ................ 251 TABLE 13: A LISTING OF THE OVERHEAD BITS WITHIN THE DS3 FRAME, AND THEIR POTENTIAL SOURCES, WITHIN THE XRT72L13 ........................................................................................................................ 252 TABLE 14: DESCRIPTION OF "METHOD 1" TRANSMIT OVERHEAD INPUT INTERFACE SIGNALS .................... 253 Figure 76. Illustration of the "Terminal Equipment" being interfaced to the "Transmit Overhead Data Input Interface" (Method 1) ................................................................................................. 254 TABLE 15: THE RELATIONSHIP BETWEEN THE NUMBER OF RISING CLOCK EDGES IN TXOHCLK, (SINCE "TXO- HFRAME" WAS LAST SAMPLED "HIGH") TO THE DS3 OVERHEAD BIT, THAT IS BEING PROCESSED ...... 255 Figure 77. Illustration of the signal that must occur between the Terminal Equipment and the XRT72L13, in order to configure the XRT72L13 to transmit a "Yellow Alarm" to the "remote terminal equipment" ............................................................................................................ 257 TABLE 16: DESCRIPTION OF "METHOD 2" TRANSMIT OVERHEAD INPUT INTERFACE SIGNALS .................... 258 Figure 78. Illustration of the "Terminal Equipment" being interfaced to the "Transmit Overhead Data Input Interface" (Method 2) ................................................................................................. 259 TABLE 17: THE RELATIONSHIP BETWEEN THE NUMBER OF “TXOHENABLE” PULSES (SINCE THE LAST OCCUR- RENCE OF THE “TXOHFRAME” PULSE) TO THE DS3 OVERHEAD BIT, THAT IS BEING PROCESSED BY THE XRT72L13 ........................................................................................................................ 260 Figure 79. Behavior of "Transmit Overhead Data Input Interface" signals between the XRT72L13 and the Terminal Equipment (for Method 2) ............................................................................. 262 4.2.3 The Transmit DS3 HDLC Controller ................................................................................................... 262 TX DS3 FEAC REGISTER (ADDRESS = 0X32) ........................................................................................... 263 TRANSMIT DS3 FEAC CONFIGURATION AND STATUS REGISTER (ADDRESS = 0X31) ................................ 263 TRANSMIT DS3 FEAC CONFIGURATION AND STATUS REGISTER (ADDRESS = 0X31) ................................. 263 Figure 80. A Flow Chart depicting how to transmit a FEAC Message via the FEAC Transmitter 264 Figure 81. LAPD Message Frame Format .......................................................................................... 265 TABLE 18: THE LAPD MESSAGE TYPE AND THE CORRESPONDING VALUE OF THE FIRST BYTE, WITHIN THE IN- FORMATION PAYLOAD ............................................................................................................... 266 TRANSMIT DS3 LAPD CONFIGURATION REGISTER (ADDRESS = 0X33) ...................................................... 266 TABLE 19: RELATIONSHIP BETWEEN TXLAPD MSG LENGTH AND THE LAPD MESSAGE SIZE ................... 266 TRANSMIT DS3 LAPD CONFIGURATION REGISTER (ADDRESS = 0X33) ...................................................... 266 TABLE 20: RELATIONSHIP BETWEEN TXLAPD MSG LENGTH AND THE LAPD MESSAGE SIZE ................... 267 TRANSMIT DS3 LAPD STATUS/INTERRUPT REGISTER (ADDRESS = 0X34) .................................................. 267 Figure 82. Flow Chart depict how to use the LAPD Transmitter ..................................................... 269 OPERATING MODE REGISTER (ADDRESS = 0X00) ...................................................................................... 269 BLOCK INTERRUPT ENABLE REGISTER (ADDRESS = 0X04) ......................................................................... 270 4.2.4 The Transmit DS3 Framer Block ........................................................................................................ 270 Figure 83. A Simple Illustration of the Transmit DS3 Framer Block and the associated paths to other Functional Blocks ................................................................................................................ 271 TX DS3 CONFIGURATION REGISTER (ADDRESS = 0X30) ............................................................................ 272 TABLE 21: THE RELATIONSHIP BETWEEN THE CONTENTS OF BIT 7 (TX YELLOW ALARM) WITHIN THE TX DS3 CONFIGURATION REGISTER, AND THE RESULTING TRANSMIT DS3 FRAMER BLOCK'S ACTION ..... 272 TABLE 22: THE RELATIONSHIP BETWEEN THE CONTENTS OF BIT 6 (TX X-BITS) WITHIN THE TX DS3 CONFIGU- RATION REGISTER, AND THE RESULTING TRANSMIT DS3 FRAMER BLOCK'S ACTION ................... 273 TABLE 23: THE RELATIONSHIP BETWEEN THE CONTENTS OF BIT 5 (TX IDLE) WITHIN THE TX DS3 CONFIGURATION REGISTER, AND THE RESULTING TRANSMIT DS3 FRAMER ACTION .............................................. 273 TABLE 24: THE RELATIONSHIP BETWEEN THE CONTENTS OF BIT 4 (TX AIS PATTERN) WITHIN THE TX DS3 CON- |
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