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XRT79L71IB Datasheet(PDF) 61 Page - Exar Corporation |
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XRT79L71IB Datasheet(HTML) 61 Page - Exar Corporation |
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61 / 441 page  áç áç áç áç PRELIMINARY XRT79L71 1 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC REV. P1.0.3 49 TRANSMIT UTOPIA INTERFACE The purpose of the Transmit UTOPIA Interface block is to function as either a Standard UTOPIA Level 1, 2 or 3 Interface as it accepts ATM cell data from either an ATM Layer or ATM Adaptation Layer Processor, and routes this ATM cell data to the TxFIFO within the XRT79L71. FIGURE 12. TIMING DIAGRAM FOR THE TRANSMIT UTOPIA INTERFACE BLOCK TABLE 10: TIMING INFORMATION FOR THE TRANSMIT UTOPIA INTERFACE BLOCK SYMBOL PARAMETER MIN.TYP MAX.UNITS t1 TxUData[15:0] to rising edge of TxUClk Setup Time 4 ns t2 TxUData[15:0] Hold Time from rising edge of TxUClk 1 ns t3 TxUTOPIA Write Enable Setup Time to rising edge of TxUClk 4 ns t4 TxUTOPIA Write Enable Hold Time from rising edge of TxUClk 1 ns t5 TxUPrty Setup Time to rising edge of TxUClk 4 ns t6 TxUPrty Hold Time from rising edge of TxUClk 1 ns t7 TxUSoC Setup Time to rising edge of TxUClk 4 ns t8 TxUSoC Hold Time from rising edge of TxUClk 1 ns t9 TxUAddr[4:0] Setup Time to rising edge of TxUClk 4 ns t10 TxUAddr[4:0] Hold Time from rising edge of TxUClk 1 ns TxUData[15:0] TxUEn* TxUPrty TxUSoC TxUClk t1 t3 t2 t5 t7 t6 t8 t4 TxUClav t11 t12 VALID DATA |
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