ADLINK aTCA-N700 - Manual (Page 33)

aTCA-RN710 User's Guide
33
Figure 6-3 Retimer configuration access
6.3 Channel Configuration
The board specific channel configuration by the GN2405A is done through an I2C interface. The
optimal operation setting at various conditions may be obtained through simulations and testing.
Summarized below is the list of the controls that can be applied to the device. Refer to the GN2405A
datasheet
for the detailed setting values. The list of the tables is quoted from the datasheet as
informative indications.
• Loss of Signal (LOS): the device can control the de-assert threshold and the hysteresis for
the LOS. The detailed setting may be found from the following list of tables in the datasheet.
Ö
Table 5-2: LOS Range Settings
Ö Table 5-3: LOS Threshold Control Register Addresses
Ö Table 5-4: LOS De-assert Threshold Positive & LOS De-assert Threshold Negative
Setting Register Address
Ö Table 5-5: LOS Hysteresis Setting Register Addresses
Ö Table 5-6: Typical LOS Threshold Settings (Range Select = Low, Hysteresis = 2)
Ö Table 5-7: Typical LOS Threshold Settings (Range Select = High, Hysteresis = 2)
Ö Table 5-8: LOS Indicator Register Addresses
• Channel Power Down and Output Enable/Disable: the device can control the channel
power down and output driver enable/disable via the I2C. Setting details can be found from
the following tables in the datasheet.
Ö
Table 5-9: Channel Power Down Enable/Disable Register Addresses
Ö Table 5-10: Output Driver Disable/Enable Register Addresses
• Data Rate Detection/Selection Enable/Disable: the device can configure either a manual
data rate selection or an automatic data rate selection, which has also an enable/disable
option. Setting details can be found from the following tables in the datasheet.
Ö
Table 5-11: Recommended Register Settings for Infiniband
Ö Table 5-12: Lock Period Control Settings
Ö Table 5-13: Rate Period Control Settings
Ö Table 5-14: Automatic Data Rate Detection Enable/disable & Manual Data Rate Setting