Xilinx UG144 manual Length see Maximum Permitted Frame

R

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Chapter 5: Using the Client Side Data Path

Table 5-2:Bit Definition for the Receiver Statistics Vector

rx_statistics_vector	Name	Description
bit(s)
20	Out of Bounds	Asserted if the previous frame exceeded the
		specified IEEE802.3-2005maximum legal
		length (see “Maximum Permitted Frame
		Length”). This is only valid if jumbo frames
		are disabled.
19	Control Frame	Asserted if the previous frame contained the
		special control frame identifier in the
		length/type field.
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	Multicast Frame	Asserted if the previous frame contained a
		multicast address in the destination address
		field.
3	Broadcast Frame	Asserted if the previous frame contained the
		broadcast address in the destination address
		field.
2	FCS Error	Asserted if the previous frame received had an
		incorrect FCS value or the MAC detected error
		codes during frame reception.
1	Bad Frame	Asserted if the previous frame received
		contained errors.
0	Good Frame	Asserted if the previous frame received was
		error-free.

Table 5-3provides conversion information against previous versions of the GEMAC.

Table 5-3:Rx Statistics conversion to previous core GEMAC core versions

Version 8.5	Version 8.4 (and earlier)
rx_statistics_vector	rx_statistics_vector	Notes
bit(s)	bit(s)
27	26	Bit 27 is equivalent to bit 26
		of all previous core
		versions.
26	N/A	Bit 26 (reserved) has been
		inserted into version 8.5 for
		statistic vector
		compatibility with the Tri-
		Mode Ethernet MAC
		LogiCORE™.
25:0	25:0	No differences

46	www.xilinx.com	1-Gigabit Ethernet MAC v8.5 User Guide
		UG144 April 24, 2009