R
Chapter 5: Using the Client-side GMII Data Path
Error Propagation
A corrupted frame transfer is illustrated in Figure
gmii_txd[7:0]preamble
gmii_tx_en
gmii_tx_er
SFD
FCS
Figure 5-2: GMII Error Propagation Within a Frame
GMII Reception
This section includes figures that illustrate GMII reception. In these figures the clock is not labelled. The source of this clock signal will vary, depending on the options used when the core is generated. For more information on clocking, see Chapters 6, 7 and 8.
Normal Frame Reception
The timing of normal inbound frame transfer is illustrated in Figure
gmii_rxd[7:0]preamble
SFD
FCS
gmii_rx_dv
gmii_rx_er
Figure 5-3: GMII Normal Frame Reception
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| UG155 March 24, 2008 |