R

-- DISCONTINUED PRODUCT --

Chapter 5: Using the Client Side Data Path

gmii_rx_clk

rx_data[7:0]

DA SA L/T DATA

rx_data_valid

rx_good_frame

rx_bad_frame

Figure 5-1:Normal Frame Reception

Frame parameters (destination address, source address, length/type and optionally FCS) are supplied on the data bus according to the timing diagram.

If the length/type field in the frame has a length interpretation, indicating that the inbound frame has been padded to meet the Ethernet minimum frame size, the padding is not passed to the client in the data payload. The exception to this is where FCS passing is enabled. See “Client-Supplied FCS Passing.”

When Client-Supplied FCS passing is disabled, rx_data_valid is equal to zero between frames for the duration of the padding field (if present), the FCS field, carrier extension (if present), the interframe gap following the frame, and the preamble field of the next frame. When Client-Supplied FCS passing is enabled, rx_data_valid is equal to zero between frames for the duration of carrier extension (if present), the interframe gap, and the preamble field of the following frame.

rx_good_frame, rx_bad_frame timing

Although the timing diagram (Figure 5-1) shows the rx_good_frame signal asserted shortly after the last valid data on rx_data, this is not always the case. The rx_good_frame or rx_bad_frame signals are asserted only after all frame checks are completed. This is after the FCS field has been received (and after reception of carrier extension, if present).

Therefore, either rx_good_frame or rx_bad_frame is asserted following frame reception at the beginning of the interframe gap.

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1-Gigabit Ethernet MAC v8.5 User Guide

 

 

UG144 April 24, 2009

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Xilinx UG144 manual Rxgoodframe, rxbadframe timing, Using the Client Side Data Path
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UG144 specifications

The Xilinx UG144, a comprehensive user guide for the versatile Zynq-7000 SoC (System on Chip) architecture, serves as an essential resource for developers and engineers designing embedded systems. Emphasizing the blend of programmable logic and processing power, this guide highlights the array of features and technologies that make the Zynq-7000 series particularly attractive for a wide range of applications.

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