Xilinx Virtex-4 User Manual

70 www.xilinx.com Embedded Tri-Mode Ethernet MAC User Guide
UG074 (v2.2) February 22, 2010
Chapter 3: Client, Host, and MDIO Interfaces
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All bit fields for the EMAC#CLIENTRXSTATS[6:0] are valid only when the
EMAC#CLIENTRXSTATSVLD is asserted as illustrated in Figure 3-37.
EMAC#CLIENTRXSTATSBYTEVLD is asserted if an Ethernet MAC frame byte (DA to
FCS inclusive) is received. This is valid on every CLIENTEMAC#RXCLIENTCLKIN cycle.
Figure 3-37: Receiver Statistics Vector Timing
DA SA DATAL/T
ug074_3_39_010906
[6:0] [26:21]
EMAC#CLIENTRXDVLD
EMAC#CLIENTRXDVLDMSW
EMAC#CLIENTRXGOODFRAME
EMAC#CLIENTRXSTATSBYTEVLD
EMAC#CLIENTRXSTATS[6:0]
EMAC#CLIENTRXSTATSVLD
EMAC#CLIENTRXD[7:0]
CLIENTEMAC#RXCLIENTCLKIN
Table 3-5: Bit Definitions for the Receiver Statistics Vector
RX_STATISTICS_VECTOR Name Description
26 ALIGNMENT_ERROR
Used in 10/100 MII mode. If an odd number of nibbles
is received, the last nibble is ignored. If the frame
without this nibble has an incorrect FCS, this bit is
asserted. If the frame has a valid FCS, this bit is not
asserted.
25 Length/Type Out of Range
Asserted if the LT field contains a length value that
does not match the number of Ethernet MAC client
data bytes received. Also asserted High if the LT field
indicates that the frame contains padding but the
number of Ethernet MAC client data bytes received is
not equal to 46 bytes (minimum frame size).
24 BAD_OPCODE
Asserted if the previous frame is error free, contains the
special control frame identifier in the LT field, but
contains an OPCODE unsupported by the Ethernet
MAC (any OPCODE other than PAUSE).
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Xilinx Virtex-4 Specifications

General

Brand	Xilinx
Model	Virtex-4
Category	Motherboard
Language	English