Core latency, Transmit path latency, Receive path latency – Xilinx LOGICORE UG144 User Manual
Page 137: Appendix d: core latency, Appendix d, “core latency, Appendix d
1-Gigabit Ethernet MAC v8.5 User Guide
137
UG144 April 24, 2009
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Appendix D
Core Latency
Transmit Path Latency
As measured from a data octet accepted on tx_data[7:0] of the transmitter client-side
interface, until that data octet appears on gmii_txd[7:0] of the physical side GMII style
interface, the latency through the core in the transmit direction is 9 clock periods of
gtx_clk
.
Receive Path Latency
As measured from a data octet accepted on gmii_rxd[7:0] of the physical side GMII
style interface, until that data octet appears on rx_data[7:0] of the receiver client-side
interface, the latency through the core in the receive direction is 9 clock periods of
gmii_rx_clk
.