XRT72L13 データシートの表示（PDF） - Exar Corporation

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XRT72L13

M13 MULTIPLEXER/CLEAR CHANNEL DS3 FRAMER IC

Exar Corporation 

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PRELIMINARY

XRT72L13

M13 MULTIPLEXER/CLEAR CHANNEL DS3 FRAMER IC

REV. P1.0.6

PMON FEBE EVENT COUNT REGISTER - MSB (ADDRESS = 0X56) .......................................................... 224

PMON FEBE EVENT COUNT REGISTER - LSB (ADDRESS = 0X57) ........................................................... 224

PMON CP-BIT ERROR COUNT REGISTER - MSB (ADDRESS = 0X58) ........................................................ 224

PMON CP-BIT ERROR COUNT REGISTER - LSB (ADDRESS = 0X59) ......................................................... 225

PMON HOLDING REGISTER (ADDRESS = 0X6C) ....................................................................................... 225

4.0 CLEAR CHANNEL FRAMER OPERATION OF THE XRT72L13 ................................................... 227

M23 CONFIGURATION REGISTER (ADDRESS = 0X07) .................................................................................. 227

4.1 DESCRIPTION OF THE DS3 FRAMES AND ASSOCIATED OVERHEAD BITS ........................................................... 227

Figure 59. DS3 Frame Format for C-bit Parity .................................................................................. 228

Figure 60. DS3 Frame Format for M13 .............................................................................................. 228

OPERATING MODE REGISTER (ADDRESS = 0X00) ..................................................................................... 229

TABLE 10: THE RELATIONSHIP BETWEEN THE CONTENT OF BIT 2, (C-BIT PARITY*/M13) WITHIN THE "FRAMER

OPERATING MODE" REGISTER AND THE RESULTING DS3 FRAMING FORMAT ............................. 229

TABLE 11: C-BIT FUNCTIONS FOR THE C-BIT PARITY DS3 FRAME FORMAT .............................................. 229

4.1.1 Frame Synchronization Bits (Applies to both M13 and C-bit Parity Framing Formats) ...................... 230

4.1.2 Performance Monitoring/Error Detection Bits (Parity) ........................................................................ 230

4.1.3 Alarm and Signaling-Related Overhead Bits ..................................................................................... 230

Valid M-bits, F-bits, and P-bits 230

4.1.4 The "Data Link" Related Overhead Bits ............................................................................................. 231

4.2 THE TRANSMIT SECTION OF THE XRT72L13 (CLEAR-CHANNEL FRAMER MODE OPERATION) ........................... 231

Figure 61. A Simple Illustration of the Transmit Section, within the XRT72L13; when it has been con-

figured to operate in the Clear-Channel Framer Mode .................................................... 232

4.2.1 The "Transmit Payload Data Input Interface" Block ........................................................................... 232

Figure 62. A Simple Illustration of the Transmit Payload Data Input Interface Block .................. 233

TABLE 12: LISTING AND DESCRIPTION OF THE PINS ASSOCIATED WITH THE "TRANSMIT PAYLOAD DATA INPUT

INTERFACE ............................................................................................................................... 234

Figure 63. Illustration of the "Terminal Equipment" being interfaced to the "Transmit Payload Data

Input Interface" block (of the XRT72L13) for Mode 1(Serial/Loop-Timing) Operation .. 236

Figure 64. Behavior of the "Terminal Interface" signals between the "Transmit Payload Data Input

Interface" block (of the XRT72L13) and the Terminal Equipment (for Mode 1 Operation) ..

237

OPERATING MODE REGISTER (ADDRESS = 0X00) ..................................................................................... 237

Figure 65. Illustration of the "Terminal Equipment" being interfaced to the "Transmit Payload Data

Input Interface" block (of the XRT72L13) for Mode 2 (Serial/Local-Timed/Frame-Slave) Op-

eration .................................................................................................................................. 238

Figure 66. Behavior of the "Terminal Interface" signals between the XRT72L13 and the Terminal

Equipment (Mode 2 Operation) .......................................................................................... 239

OPERATING MODE REGISTER (ADDRESS = 0X00) ..................................................................................... 240

Figure 67. Illustration of the "Terminal Equipment" being interfaced to the "Transmit Payload Data

Input Interface" block (of the XRT72L13) for Mode 3 (Serial/Local-Timed/Frame-Master)

Operation ............................................................................................................................. 241

Figure 68. Behavior of the Terminal Interface signals between the XRT72L13 and the Terminal

Equipment (DS3 Mode 3 Operation) .................................................................................. 242

OPERATING MODE REGISTER (ADDRESS = 0X00) ..................................................................................... 242

Figure 69. Illustration of the "Terminal Equipment" being interfaced to the "Transmit Payload Data

Input Interface" block (of the XRT72L13) for Mode 4 (Nibble-Parallel/Loop-Timed) Opera-

tion ........................................................................................................................................ 243

Figure 70. Behavior of the Terminal Interface signals between the XRT72L13 and the Terminal

Equipment (Mode 4 Operation) .......................................................................................... 244

OPERATING MODE REGISTER (ADDRESS = 0X00) ..................................................................................... 244

Figure 71. Illustration of the "Terminal Equipment" being interfaced to the "Transmit Payload Data

Input Interface" block (of the XRT72L13) for Mode 5 (Nibble-Parallel/Local-Timed/Frame-

Slave) Operation ................................................................................................................. 246

Figure 72. Behavior of the "Terminal Interface" signals between the XRT72L13 and the Terminal

Equipment (DS3 Mode 5 Operation) .................................................................................. 247

VII

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