Xilinx IP Ethernet AVB Endpoint v2.4 UG492 - Manual (Page 66)

66 www.xilinx.com Ethernet AVB Endpoint User Guide
UG492 September 21, 2010
Chapter 7: Ethernet AVB Endpoint Reception
Error Free Legacy Frame Reception
Figure 7-1 illustrates the timing of a normal inbound error free frame transfer that has been
accepted by the “Legacy MAC Header Filters” The legacy client must be prepared to
accept data at any time; there is no buffering within the core to allow for latency in the
receive client. After frame reception begins, data is transferred on consecutive clock
enabled cycles to the receive client until the frame is complete. The core asserts the
legacy_rx_frame_good
signal to indicate that the frame was intended for the legacy
traffic client and was successfully received without error.
X-Ref Target - Figure 7-1
Figure 7-1: Normal Frame Reception across the Legacy Traffic Interface
rx_clk
legacy_rx_data[7:0]
legacy_rx_data_valid
legacy_rx_frame_good
rx_clk_enable
DA SA DATA L/T
legacy_rx_frame_bad