XRT79L74IB View Datasheet(PDF) - Exar Corporation

Part Name

Description

MFG CO.

XRT79L74IB

4 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC

Exar Corporation 

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PRELIMINARY

4 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC

XRT79L74

REV. P1.0.0

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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