Achronix Speedster22i SerDes - Manual (Page 59)

Figure 30: Outline Window, When Lane-Specific PMA Settings are Enabled
RX PMA Equalization
This page allows the user to change the PMA equalization settings on the receive path. The
entry fields and the available options are listed in “Table 13: RX PMA Equalization”. This
table also presents the choices that are made for the current design: simple_serdes_design.
Note: All analog settings in “Table 13: RX PMA Equalization” and the tables to follow are
provided for reference only. For challenging physical links, the equalization settings need to
be tuned by the user.
Table 13: RX PMA Equalization
Entry field Purpose Available Options* Choice made
Low Freq AGC
Gain
Automatic Gain Control (AGC)
to make the SerDes suitable
over a range of signal levels
• Disconnected
• -18.1 dB
• -12.2 dB
• -8.7 dB
• -6.2 dB
• -4.3 dB
• -2.7 dB
• -1.3 dB
-18.1 dB
(default)
High Freq AGC
DC Gain
Control DC Gain of High
Frequency RX AGC
• -2.94 dB
• -1.3 dB
• 0.332 dB
• 1.97 dB
• 3.6 dB
• 5.21 dB
-2.94 dB
(default)
UG028, July 1, 2014 59