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TLK6002 数据表(PDF) 34 Page - Texas Instruments |
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TLK6002 数据表(HTML) 34 Page - Texas Instruments |
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34 / 96 page ![]() TLK6002 SLLSE34 – MAY 2010 www.ti.com that greater than 4.5 seconds of time can be programmed per attempted interval. Thus, the ARS state machine will attempt to determine a particular serial rate for a programmable number of reference clock periods where channel synchronization cannot be established before attempting the next (and different) lower serial bit rate, in a repeating/looping fashion when the lowest enabled serial bit rate is attempted unsuccessfully. The ARS function overrides the following SERDES register settings (RATE_TX / RATE_RX / PLL_MULT). MDIO writes to these registers do not impact the actual values controlling internal SERDES device settings as long as ARS is enabled for that channel, and reads instead return the current settings (which may or may not be valid) as controlled by the ARS state machine (and does so until ARS is disabled). Table 2-7. ARS Looped Device Settings (Looping order highest → lowest enabled bit rate) Reference Clock (MHz) ARS Rate / Scale / Multiplier Settings Per Reference Clock 153.6 122.88 307.2 Standard Serial Rate (Gbps) Rate Rate Scale SERDES Multiplier Setting Loop CPRI 0.6144 Eighth 4 16 20 8 OBSAI 0.768 Eighth 4 20 25 10 CPRI 1.2288 Quarter 2 16 20 8 OBSAI 1.536 Quarter 2 20 25 10 CPRI 2.4576 Half 1 16 20 8 CPRI/OBSAI 3.072 Half 1 20 25 10 CPRI 4.9152 Full 0.5 16 20 8 CPRI/OBSAI 6.144 Full 0.5 20 25 10 34 Description Copyright © 2010, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Link(s): TLK6002 |
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