ADLINK aTCA-N700 - Manual (Page 32)

aTCA-RN720 User's Guide
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6.2 The Retimer, GN2405A
The GN2405A architecture is illustrated in Figure 6-2, showing quad entities for both RX and TX.
The features of GN2405A are summarized as the following:
• Quad Datacom Repeater / Retimer supporting four RX lanes and four TX lanes
• Continuous rate operation from 9.95Gb/s to 11.3Gb/s
• Support for 2.5Gb/s and 5Gb/s data rates
• Compensate for up to 28dB of loss
• Integrated 6dB equalizer at input
• On chip 100Ω differential I/O termination
• I
2 C Control Interface
Figure 6-2 GN2405 Block diagram
The retimers are configured through an I2C bus. The configuration I2C bus is from the Zone 3
connector connects to the PCA9547 I2C HUB to reach to the retimers. The retimers on the RTM
I2C bus always function as a slave.
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.