GTS Transceiver PHY User Guide

ID 817660
Date 4/01/2024
Public

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2.3.1.1. Transmitter Buffer

A simplified transmitter buffer termination scheme is shown in the following figure.
Figure 15. Simplified TX Buffer Termination
  1. ZTX-DIFF-DC transmitter buffer output differential DC impedance is 90 Ω; 45 Ω single ended.
The transmitter buffer can be programmed to support the taps listed in the following table.
Table 8.  Transmitter PMA Equalizer Parameters
Parameter Cursor Rule Increment and Decrement Size
Minimum Maximum
pre_tap_2 C-2 0 +7 1.0
pre_tap_1 C-1 0 +15 1.0
main_tap C0 14 0 +55 1.0
post_tap_1 C+1 0 +19 1.0
Note: To determine the legal combination of TX equalizer parameter settings, refer to the GTS Transceiver TX Equalization Tool
14 C0 = main_tap + 1 - pre_tap_1 -pre_tap_2 - post_tap_1