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XRT91L82IB Datasheet(PDF) 8 Page - Exar Corporation |
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XRT91L82IB Datasheet(HTML) 8 Page - Exar Corporation |
8 / 59 page XRT91L82 PRELIMINARY xr xr xr xr 2.488/2.666 GBPS STS-48/STM-16 SONET/SDH TRANSCEIVER REV. P1.0.5 5 REF2CLKP REF2CLKN LVPECL Diff I A11 B11 Reference Clock Input 2 This differential clock input reference is used for the transmit clock multiplier unit (CMU) and clock data recovery (CDR) to provide the necessary high-speed clock reference for this device. Pin REFREQSEL[1:0] determines the value used as the reference. See Pin REFREQSEL[1:0] for more details. Internally terminated and biased. REFREQSEL1 / SCLK LVTTL, LVCMOS I D12 Reference Clock Frequency Select Hardware Mode REFREQSEL1 pin is used to select the fre- quency of the REF1CLK and/or REF2CLK input to the CMU and CDR. NOTE: Non-FEC rates require 155.52 MHz clock reference. FEC rates require 166.63 MHz clock reference This pin is provided with an internal pull-down. Host Mode This pin is functions as the microprocessor Serial Clock Input. REFREQSEL0 LVTTL, LVCMOS I E12 Reference Clock Frequency Select REFREQSEL0 pin is used to select the frequency of the REF1CLK and/or REF2CLK input to the CMU and CDR. NOTE: Non-FEC rates require 155.52 MHz clock reference. FEC rates require 166.63 MHz clock reference This pin is provided with an internal pull-down. COMMON CONTROL NAME LEVEL TYPE PIN DESCRIPTION REFREQSEL [1:0] CMU REFERENCE FREQUENCY CDR REFERENCE FREQUENCY 00 155.52 MHz present on REF1CLK REF2CLK not used 155.52 MHz present on REF1CLK REF2CLK not used 01 155.52 MHz present on REF1CLK 166.63 MHz present on REF2CLK 10 166.63 MHz present on REF2CLK 155.52 MHz present on REF1CLK 11 166.63 MHz present on REF2CLK REF1CLK not used 166.63 MHz present on REF2CLK REF1CLK not used REFREQSEL [1:0] CMU REFERENCE FREQUENCY CDR REFERENCE FREQUENCY 00 155.52 MHz present on REF1CLK REF2CLK not used 155.52 MHz present on REF1CLK REF2CLK not used 01 155.52 MHz present on REF1CLK 166.63 MHz present on REF2CLK 10 166.63 MHz present on REF2CLK 155.52 MHz present on REF1CLK 11 166.63 MHz present on REF2CLK REF1CLK not used 166.63 MHz present on REF2CLK REF1CLK not used |
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