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XRT72L56 Datasheet(PDF) 8 Page - Exar Corporation |
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XRT72L56 Datasheet(HTML) 8 Page - Exar Corporation |
8 / 486 page XRT72L56 áç áç áç áç SIX CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER REV. P1.1.2 PRELIMINARY VI face block of the XRT72L56 for Mode 2 (Serial/Local-Timed/Frame-Slave) Operation ...................... 157 Figure 47. Behavior of the Terminal Interface signals between the XRT72L56 and the Terminal Equipment (Mode 2 Operation) ............................................................................................................................. 158 FRAMER OPERATING MODE REGISTER (ADDRESS = 0X00) ..................................................................... 158 Figure 48. Illustration of the Terminal Equipment being interfaced to the Transmit Payload Data Input Inter- face block of the XRT72L56 for Mode 3 (Serial/Local-Timed/Frame-Master) Operation .................... 159 Figure 49. Behavior of the Terminal Interface signals between the XRT72L56 and the Terminal Equipment (DS3 Mode 3 Operation) ..................................................................................................................... 160 FRAMER OPERATING MODE REGISTER (ADDRESS = 0X00) ..................................................................... 161 Figure 50. Illustration of the Terminal Equipment being interfaced to the Transmit Payload Data Input Inter- face block of the XRT72L56 for Mode 4 (Nibble-Parallel/Loop-Timed) Operation .............................. 162 Figure 51. Behavior of the Terminal Interface signals between the XRT72L56 and the Terminal Equipment (Mode 4 Operation) ............................................................................................................................. 163 FRAMER OPERATING MODE REGISTER (ADDRESS = 0X00) ..................................................................... 163 Figure 52. Illustration of the Terminal Equipment being interfaced to the Transmit Payload Data Input Inter- face block of the XRT72L56 for Mode 5 (Nibble-Parallel/Local-Timed/Frame-Slave) Operation ........ 165 Figure 53. Behavior of the Terminal Interface signals between the XRT72L56 and the Terminal Equipment (DS3 Mode 5 Operation) ..................................................................................................................... 166 FRAMER OPERATING MODE REGISTER (ADDRESS = 0X00) ..................................................................... 166 Figure 54. Illustration of the Terminal Equipment being interfaced to the Transmit Payload Data Input Inter- face block of the XRT72L56 for Mode 6 (Nibble-Parallel/Local-Timed/Frame-Master) Operation ...... 167 Figure 55. Behavior of the Terminal Interface signals between the XRT72L56 and the Terminal Equipment (DS3 Mode 6 Operation) ..................................................................................................................... 168 FRAMER OPERATING MODE REGISTER (ADDRESS = 0X00) ..................................................................... 169 4.2.2 The Transmit Overhead Data Input Interface ........................................................................................ 169 Figure 56. Simple Illustration of the Transmit Overhead Data Input Interface block .......................... 169 TABLE 20: A LISTING OF THE OVERHEAD BITS WITHIN THE DS3 FRAME, AND THEIR POTENTIAL SOURCES, WITHIN THE XRT72L56 IC ................................................................................................................................ 170 TABLE 21: DESCRIPTION OF METHOD 1 TRANSMIT OVERHEAD INPUT INTERFACE SIGNALS ...................... 171 Figure 57. Illustration of the Terminal Equipment being interfaced to the Transmit Overhead Data Input In- terface (Method 1) ............................................................................................................................... 172 TABLE 22: 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 ............... 173 Figure 58. Illustration of the signal that must occur between the Terminal Equipment and the XRT72L56, in order to configure the XRT72L56 to transmit a Yellow Alarm to the remote terminal equipment .... 175 TABLE 23: DESCRIPTION OF METHOD 2 TRANSMIT OVERHEAD INPUT INTERFACE SIGNALS ...................... 176 Figure 59. Illustration of the Terminal Equipment being interfaced to the Transmit Overhead Data Input In- terface (Method 2) ............................................................................................................................... 177 TABLE 24: THE RELATIONSHIP BETWEEN THE NUMBER OF TXOHENABLE PULSES (SINCE THE LAST OCCURRENCE OF THE TXOHFRAME PULSE) TO THE DS3 OVERHEAD BIT, THAT IS BEING PROCESSED BY THE XRT72L56 178 Figure 60. Behavior of Transmit Overhead Data Input Interface signals between the XRT72L56 and the Terminal Equipment (for Method 2) ..................................................................................................... 180 4.2.3 The Transmit DS3 HDLC Controller ...................................................................................................... 180 TX DS3 FEAC REGISTER (ADDRESS = 0X32) ........................................................................................ 181 TRANSMIT DS3 FEAC CONFIGURATION AND STATUS REGISTER (ADDRESS = 0X31) ............................... 181 TRANSMIT DS3 FEAC CONFIGURATION AND STATUS REGISTER (ADDRESS = 0X31) ............................... 181 Figure 61. A Flow Chart depicting how to transmit a FEAC Message via the FEAC Transmitter ...... 182 Figure 62. LAPD Message Frame Format .......................................................................................... 183 TABLE 25: THE LAPD MESSAGE TYPE AND THE CORRESPONDING VALUE OF THE FIRST BYTE, WITHIN THE INFOR- MATION PAYLOAD .................................................................................................................................. 183 TRANSMIT DS3 LAPD CONFIGURATION REGISTER (ADDRESS = 0X33) ................................................... 184 TABLE 26: RELATIONSHIP BETWEEN TXLAPD MSG LENGTH AND THE LAPD MESSAGE SIZE .................. 184 TRANSMIT DS3 LAPD CONFIGURATION REGISTER (ADDRESS = 0X33) ................................................... 184 TABLE 27: RELATIONSHIP BETWEEN TXLAPD MSG LENGTH AND THE LAPD MESSAGE SIZE .................. 184 TRANSMIT DS3 LAPD STATUS/INTERRUPT REGISTER (ADDRESS = 0X34) ............................................... 185 |
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