XRT72L13 datasheet(10/370 Pages) EXAR

10 / 370 page

XRT72L13

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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

TABLE 23: THE RELATIONSHIP BETWEEN THE CONTENTS OF BIT 5 (TX IDLE) WITHIN THE TX DS3 CONFIGURATION

TABLE 24: THE RELATIONSHIP BETWEEN THE CONTENTS OF BIT 4 (TX AIS PATTERN) WITHIN THE TX DS3 CON-

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