Interfacing with Client Proprietary Logic/IP Catalog Tri-Mode Ethernet MAC - 16.2 English

1G/2.5G Ethernet PCS/PMA or SGMII LogiCORE IP Product Guide (PG047)

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16.2 English
This module creates the sgmii_clk_en clock enable signal for use throughout the SGMII adaptation module. Clock enabled frequencies are:
  • 125 MHz at an operating speed of 1 Gbps
  • 12.5 MHz at an operating speed of 100 Mbps
  • 1.25 MHz at an operating speed of 10 Mbps

The following figure shows the output clock enable signal for the Clock Generation module at 1 Gbps and 100 Mbps speeds.

Figure 1. Clock Generator Output Clocks and Clock Enable

The above figure also shows the formation of the sgmii_clk_r and sgmii_clk_f signals. These are used only in the example design delivered with the core, where they are routed to a device IOB DDR output register. This provides SGMII clock forwarding at the correct frequency; these signal can be ignored when connecting the core and SGMII Adaptation module to internal logic.