TLK3132 Datasheet, PDF (87/103 Pages) Texas Instruments – 2-Channel Multi-Rate Transceiver

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A APPENDIX A – Frequency Ranges Supported
TLK3132
2-Channel Multi-Rate Transceiver
SLLS956 – DECEMBER 2008
The following tables show the details of REFCLK input frequency versus Jitter Cleaner PLL multiplier
value for each application TLK3132 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.
TLK3132
REFCLK Input
(MHz)
62.50000
62.50000
62.50000
62.50000
62.50000
125.00000
125.00000
125.00000
125.00000
125.00000
250.00000
250.00000
250.00000
250.00000
250.00000
Table A-1. Reference Clock Selection – Gigabit Ethernet Mode
Jitter Cleaner
Multiplier
OFF
0.25
0.5
1
2
OFF
0.25
0.5
1
2
OFF
0.25
0.5
1
2
Gigabit Ethernet Mode - Legal Clocking Mode Settings
SERDES
REFCLK Input
(MHz)
SERDES PLL
Multiplier
Serial Data Rate = f(SPEED[1:0]) (Mbps)
Full (00)
Half (01)
Qrtr (10)
62.50000
20
2500.000
1250.000
625.000
15.62500
31.25000
62.50000
20
2500.000
1250.000
625.000
125.00000
10
2500.000
1250.000
625.000
125.00000
10
2500.000
1250.000
625.000
31.25000
62.50000
20
2500.000
1250.000
625.000
125.00000
10
2500.000
1250.000
625.000
250.00000
5
2500.000
1250.000
625.000
250.00000
5
2500.000
1250.000
625.000
62.50000
20
2500.000
1250.000
625.000
125.00000
10
2500.000
1250.000
625.000
250.00000
5
2500.000
1250.000
625.000
500.00000
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APPENDIX A – Frequency Ranges Supported
87