Using Multiple Instances of the Core - 4.1 English

GMII to RGMII Product Guide (PG160)

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4.1 English

This Figure shows how multiple instances of this core should be connected in a design so that clock resources can be saved using the shared logic feature.

Figure 3-10:      Multiple instances of GMII to RGMII Core in a Design

X-Ref Target - Figure 3-10


Both the core instances are configured for the GMII TX clock to be sourced internally. For example, GMII_TO_RGMII_0, shared logic is in the core and for IP instance GMII_to_RGMII_1, shared logic is in the example design (which means the IP block level does not have any shared clock/reset resources). Instance GMII_TO_RGMII_0 generates all the required clocks, namely ref_clk and the GMII TX clock. These clocks are used by the instance GMII_TO_RGMII_0 internally and also shared with instance GMII_TO_RGMII_1.