Quartus® Prime Pro Edition User Guide: Platform Designer
Visible to Intel only — GUID: mwh1409959135252
Ixiasoft
Visible to Intel only — GUID: mwh1409959135252
Ixiasoft
4.7.4. Duration of Transfers Crossing Clock Domains
CDC logic extends the duration of host transfers across clock domain boundaries. In the worst case, which is for reads, each transfer is extended by five host clock cycles and five agent clock cycles. Assuming the default value of 2 for the host domain synchronizer length and the agent domain synchronizer length, the components of this delay are the following:
- Four additional host clock cycles, due to the host-side clock synchronizer.
- Four additional agent clock cycles, due to the agent-side clock synchronizer.
- One additional clock in each direction, due to potential metastable events as the control signals cross clock domains.