Appendix A - Frequency Ranges Supported - Texas Instruments TLK3134 Data Manual

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A APPENDIX A – Frequency Ranges Supported
The following tables show the details of REFCLK input frequency versus Jitter Cleaner PLL multiplier
value for each application TLK3134 supports.
If the desired serial bit rate is between 2.0 Gbps and 3.75 Gbps, full rate should be selected for the
RATE[1:0] bits for that channel.
If the desired serial bit rate is between 1.0 Gbps and 2.125 Gbps, half rate should be selected for the
RATE[1:0] bits for that channel.
If the desired serial bit rate is between 600 Mbps and 1.0625 Gbps, quarter rate should be selected for the
RATE[1:0] bits for that channel.
If the desired serial bit rate falls in the overlap between the full and half rate ranges defined above, then
either setting is appropriate.
If the desired serial bit rate falls in the overlap between the half and quarter rate ranges defined above,
then either setting is appropriate.
In general, there are many different settings that will yield the same serial bit rate. It should be noted that
selecting the setting with the highest SERDES REFCLK and the lowest SERDES PLL Multiplier will give
the best serial performance.
XAUI Mode - Legal Clocking Mode Settings
TLK3134
REFCLK
Input (MHz) Multiplier Input (MHz) Multiplier
78.12500
78.12500
78.12500
78.12500
78.12500
156.25000
156.25000
156.25000
156.25000
156.25000
312.50000
312.50000
312.50000
312.50000
312.50000
Figure A-1. Reference Clock Selection – XAUI – 10 GbE Mode
Copyright © 2007–2009, Texas Instruments Incorporated
Jitter SERDES SERDES
Cleaner REFCLK
OFF 78.12500
0.25 19.53125
0.5 39.06250
1 78.12500
2 156.25000
OFF 156.25000
0.25 39.06250
0.5 78.12500
1 156.25000
2 312.50000
OFF 312.50000
0.25 78.12500
0.5 156.25000
1 312.50000
2 625.00000
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SLLS838F – MAY 2007 – REVISED DECEMBER 2009
Serial Data Rate = f(SPEED[1:0]) (Mbps)
PLL Full (00) Half (01)
20 3125.000 1562.500
20 3125.000 1562.500
10 3125.000 1562.500
10 3125.000 1562.500
20 3125.000 1562.500
10 3125.000 1562.500
5 3125.000 1562.500
5 3125.000 1562.500
20 3125.000 1562.500
10 3125.000 1562.500
5 3125.000 1562.500
APPENDIX A – Frequency Ranges Supported
TLK3134
TLK3134
Qrtr. (10)
781.250
781.250
781.250
781.250
781.250
781.250
781.250
781.250
781.250
781.250
781.250
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