Xilinx LOGICORE UG144 - Manual (Page 50)

50 www.xilinx.com 1-Gigabit Ethernet MAC v8.5 User Guide
UG144 April 24, 2009
Chapter 5: Using the Client Side Data Path R
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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
Table 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
DA SA
tx_ifg_delay
IFG ADJUST VALUE
0x0D
13 Idles inserted between the
end of frame and the preamble
field of the following frame
DA
Next IFG ADJUST VALUE
Figure 5-11: Transmitter Statistic Vector Timing
gtx_clk
tx_statistic_vector[31:0]
tx_statistic_valid