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XRT79L74IB Datasheet(PDF) 5 Page - Exar Corporation

Part # XRT79L74IB
Description  4 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC
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Manufacturer  EXAR [Exar Corporation]
Direct Link  http://www.exar.com
Logo EXAR - Exar Corporation

XRT79L74IB Datasheet(HTML) 5 Page - Exar Corporation

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PRELIMINARY
XRT79L74
4 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC
REV. P1.0.0
B
TRANSMIT PAYLOAD DATA INPUT INTERFACE - TIMING REQUIREMENTS..................................... 54
TABLE 9: TIMING INFORMATION FO RTHE TRNASMIT PAYLOAD DATA INPUT INTERFACE BLOCK .......................................................... 54
FIGURE 11. TIMING DIAGRAM FOR THE TRANSMIT PAYLOAD DATA INPUT INTERFACE WHEN THE XRT79L74 IS OPERATING IN BOTH THE DS3
AND
LOOP-TIMING MODES .............................................................................................................................................. 55
FIGURE 12. TIMING DIAGRAM FOR THE TRANSMIT PAYLOAD DATA INPUT INTERFACE WHEN THE XRT79L74 IS OPERATING IN BOTH THE DS3
AND
LOCAL-TIMING MODES............................................................................................................................................. 56
FIGURE 13. TIMING DIAGRAM FOR THE TRANSMIT PAYLOAD DATA INPUT INTERFACE WHEN THE XRT79L74 IS OPERATING IN BOTH THE DS3/
NIBBLE-PARALLEL AND LOOP-TIMING MODES .................................................................................................................. 56
FIGURE 14. TIMING DIAGRAM FOR THE TRANSMIT PAYLOAD DATA INPUT INTERFACE WHEN THE XRT79L74 IS OPERATING IN BOTH THE DS3/
NIBBLE-PARALLEL AND LOCAL-TIMING MODES................................................................................................................. 57
TRANSMIT OVERHEAD DATA INPUT INTERFACE...................................................... 58
TRANSMIT OVERHEAD DATA INPUT INTERFACE - TIMING REQUIREMENTS.................................. 58
TABLE 10: TIMING INFORMATION FOR THE TRANSMIT OVERHEAD DATA INPUT INTERFACE BLOCK ..................................................... 58
FIGURE 15. TIMING DIAGRAM FOR THE TRANSMIT OVERHEAD DATA INPUT INTERFACE (METHOD 1 ACCESS) .................................... 60
FIGURE 16. TIMING DIAGRAM FOR THE TRANSMIT OVERHEAD DATA INPUT INTERFACE (METHOD 2 ACCESS) .................................... 60
RECEIVE PAYLOAD DATA OUTPUT INTERFACE ....................................................... 61
RECEIVE PAYLOAD DATA OUTPUT INTERFACE - TIMING REQUIREMENTS ................................... 61
TABLE 11: TIMING INFORMATION FOR THE RECEIVE PAYLOAD DATA OUTPUT INTERFACE BLOCK ...................................................... 61
FIGURE 17. TIMING DIAGRAM FOR THE RECEIVE PAYLOAD DATA OUTPUT INTERFACE (SERIAL MODE).............................................. 61
FIGURE 18. TIMING DIAGRAM FOR THE RECEIVE PAYLOAD DATA OUTPUT INTERFACE (NIBBLE-PARALLEL MODE) ............................. 62
RECEIVE OVERHEAD DATA OUTPUT INTERFACE .................................................... 63
RECEIVE OVERHEAD DATA OUTPUT INTERFACE - TIMING REQUIREMENTS ................................ 63
AC ELECTRICAL CHARACTERISTICS (CONT.)................................................................................................. 63
FIGURE 19. TIMING DIAGRAM FOR THE RECEIVE OVERHEAD DATA OUTPUT INTERFACE (METHOD 1 - USING RXOHCLK) .................. 64
FIGURE 20. TIMING DIAGRAM FOR THE RECEIVE OVERHEAD DATA OUTPUT INTERFACE (METHOD 2 - USING RXOHENABLE) ............ 64
RECEIVE UTOPIA INTERFACE ...................................................................................... 65
RECEIVE UTOPIA INTERFACE ............................................................................................................... 65
FIGURE 21. TIMING DIAGRAM FOR THE RECEIVE UTOPIA INTERFACE BLOCK .................................................................................. 65
TABLE 12: TIMING INFORMATION FOR THE RECEIVE UTOPIA INTERFACE BLOCK ............................................................................. 65
ORDERING INFORMATION ............................................................................................ 67
PACKAGE DIMENSIONS ................................................................................................ 67
REVISION HISTORY ...................................................................................................................................... 68


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