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50 www.xilinx.com 1-Gigabit Ethernet MAC v8.5 User Guide

UG144 April 24, 2009

Chapter 5: Using the Client Side Data Path

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Transmitter Statistics Vector

The statistics for the transmitted frame are contained within the tx_statistic_vector.

The vector is driven synchronously by the transmitter clock, gtx_clk, following frame

transmission. The bit field definition for the vector is defined in Table 5-4.

All bit fields, with the exception of byte valid, are valid only when

tx_statistic_valid is asserted (Figure 5-11). Byte valid is significant on every

gtx_clk cycle.

Caution!

The statistic vectors in this release have been made compatible with the Tri-Mode

Ethernet MAC core. They are not backwards compatible with previous versions of the 1-Gigabit

Ethernet MAC core (see Tabl e 5- 5 for Transmitter Statistic Vector conversion details).

Figure 5-10: Inter-Frame Gap Adjustment

gtx_clk

tx_data[7:0]

tx_data_valid

tx_ack

tx_ifg_delay

IFG ADJUST VALUE

0x0D

13 Idles inserted between the

end of frame and the preamble

field of the following frame

Next IFG ADJUST VALUE

Figure 5-11: Transmitter Statistic Vector Timing

gtx_clk

tx_statistic_vector[31:0]

tx_statistic_valid

1 2 ... 45 46 47 48 49 50 51 52 53 54 55 ... 137 138

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