DS537 Datasheet, PDF (85/148 Pages) Xilinx, Inc – LogiCORE IP XPS LL TEMAC

LogiCORE IP XPS LL TEMAC (v2.03a)
Table 59: Receive Statistics Bit Definitions
ClientTxStats
Name
Description
21
VLAN_FRAME
Asserted if the previous frame contains a VLAN identifier in the
Length/Type field when the receiver VLAN operation is enabled.
OUT_OF_BOUNDS
20
Asserted if the previous frame exceeded the specified IEEE Std
802.3-2002 maximum legal length. This is only valid if jumbo frames are
disabled.
19
CONTROL_FRAME
Asserted if the previous frame contains the special control frame identifier
in the Length/Type field.
5 - 18
FRAME_LENGTH_COUNT
The length of the previous frame in number of bytes. The count sticks at
16383 for any jumbo frames larger than this value.
4
MULTICAST_FRAME
Asserted if the previous frame contains a multicast address in the
destination field.
3
BROADCAST_FRAME
Asserted if the previous frame contains the broadcast address in the
destination field.
2
FCS_ERROR
1
BAD_FRAME⁽¹⁾
Asserted if the previous frame received has an incorrect FCS value or the
XPS_LL_TEMAC detects error codes during reception.
Asserted if the previous frame received contains errors.
0
GOOD_FRAME⁽¹⁾
Asserted if the previous frame received is error free.
1. If the Length/Type field error checks are disabled, then a frame containing this type of error is marked as a GOOD_FRAME,
providing no additional errors are detected.
X-Ref Target - Figure 53
RxClientClk
RX data interface from PHY
RX valid signal from PHY
Ethernet Frame from PHY
ClientRxStatsByte Vld
ClientRxStatsVld
ClientRxStats(6:0)
6:0 1_3:7 20:1426:21
DS537_53_091909
Figure 53: Receive Statistics Waveforms
Extended VLAN Support
VLAN General Information
VLAN (or Virtual Local Area Network) frames are used to segregate Ethernet traffic within a larger physical LAN.
VLAN frames are created by inserting a four byte VLAN TAG field in an Ethernet frame where the two byte
Type/Length field would normally occur thus extending the overall frame by 4 bytes. The VLAN TAG field is
further broken down into additional fields as shown in Figure 54.
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