Xilinx UG144 manual Name

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Transmitting Outbound Frames

Table 5-4:Bit Definition for the Transmitter Statistics Vector

R

tx_statistics_vector
bit(s)	Name	Description
31	Pause Frame	Asserted if the previous frame was a pause
		frame that the MAC itself initiated in
		response to a pause_req assertion.
30	Byte Valid	Asserted if a MAC frame byte (DA to FCS
		inclusive) is in the process of being
		transmitted. This is valid on every clock
		cycle.
		Do not use this as an enable signal to
		indicate that data is present on gmii_txd.
29:20	Reserved	Always at logic 0.
19	VLAN Frame	Asserted if the previous frame contained a
		VLAN identifier in the length/type field
		when transmitter VLAN operation is
		enabled.
18:5	Frame Length	The length of the previous frame in number
		of bytes. The count will stick at 16,383 for
		any jumbo frames larger than this value.
4	Control Frame	Asserted if the previous frame had the
		special MAC Control Type code 88-08 in the
		length/type field.
3	Underrun Frame	Asserted if the previous frame contained an
		underrun error.
2	Multicast Frame	Asserted if the previous frame contained a
		multicast address in the destination address
		field.
1	Broadcast Frame	Asserted if the previous frame contained a
		broadcast address in the destination address
		field.
0	Successful Frame	Asserted if the previous frame was
		transmitted without error.

1-Gigabit Ethernet MAC v8.5 User Guide www.xilinx.com 51

UG144 April 24, 2009