Spartan-6 GTP Transceiver - Recommended PMA_CDR_CFG settings for improved CDR performance
Description
This Answer Record discusses updates to the PMA_RX_CFG attribute for the Spartan-6 GTP Transceiver to improve performance in a variety of situations.
Solution
The table below includes updated values for PMA_RX_CFG for a variety of setups. These values have shown to be optimized for these situations:
Line Rate (Gbps) | Reference Clock Offset | PLL Output Divider | PMA_RX_CFG |
2.4 - 3.24 | 0 | 1 | 0x05CE004 |
1.2 - 1.62 | 0 | 2 | 0x05CE008 |
0.6 - 0.81 | 0 | 4 | 0x05CE008 |
2.4 - 3.24 | +/-200ppm | 1 | 0x05CE089 |
1.2 - 1.62 | +/-200ppm | 2 | 0x05CE049 |
0.6 - 0.81 | +/-200ppm | 4 | 0x05CE049 |
Applies To
Devices
- Spartan-6 LXT
IP
- Virtex-6 GTX Transceiver Wizard