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# CDC #304
## Origin Flip-flop
|Graph|Signal|Clock Domain|Flip-flop|
|:---:|---|---|---|
|
|Signal: `inst_phy_plus_lane.inst_fifo_in_ctrl.cmd_flush_req`
Usage:
- fifo_dc.vhd#441
- fifo_dc.vhd#456
- fifo_dc.vhd#474|CLK (rising)|TOP (spacefibre_light_top) > inst_phy_plus_lane (phy_plus_lane) > inst_fifo_in_ctrl (FIFO_DC) > fifo_dc.vhd#440|
## Target Flip-flop
|Graph|Signal|Clock Domain|Flip-flop|
|:---:|---|---|---|
|
|Signal: `inst_phy_plus_lane.inst_fifo_in_ctrl.RD_DATA_VLD`
Usage:
- fifo_dc.vhd#301
- fifo_dc.vhd#304
- fifo_dc.vhd#308|inst_phy_plus_lane.clk_tx (rising)|TOP (spacefibre_light_top) > inst_phy_plus_lane (phy_plus_lane) > inst_fifo_in_ctrl (FIFO_DC) > fifo_dc.vhd#300|
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