Xilinx Virtex-4 User Manual page 68

Chapter 3: Client, Host, and MDIO Interfaces
Table 3-4: Bit Definitions for the Transmitter Statistics Vector (Cont'd)
TX_STATISTICS_VECTOR
20
19
[18:5]
4
3
2
1
0
Notes:
1. Bits [28:20] of TX_STATISTICS_VECTOR are valid for half-duplex mode only.
Receiver Statistics Vector
RX_STATISTICS_VECTOR contains the statistics for the frame received. The vector is
driven synchronously by the receiver clock, CLIENTEMAC#RXCLIENTCLKIN, following
frame reception. The bit field definition for the receiver statistics vector is defined in
Table
The RX_STATISTICS_VECTOR is a 27-bit wide vector, and is internal in the receive engine.
This vector is muxed out to a seven-bit wide signal EMAC#CLIENTRXSTATS[6:0] as
shown in
CLIENTEMAC#RXCLIENTCLKIN
RX_STATISTICS_VALID
(internal signal)
RX_STATISTICS_VECTOR[26:0]
(internal signal)
EMAC#CLIENTRXSTATSVLD
EMAC#CLIENTRXSTATS[6:0]
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68
Name
TX_DEFERRED
VLAN_FRAME
FRAME_LENGTH_COUNT
CONTROL_FRAME
UNDERRUN_FRAME
MULTICAST_FRAME
BROADCAST_FRAME
SUCCESSFUL_FRAME
3-5.
Figure 3-35.
[6:0] [13:7]
Figure 3-35: Receiver Statistics MUX Timing
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Description
Asserted if transmission of the frame was
deferred.
Asserted if the previous frame contains a VLAN
identifier in the LT field when transmitter VLAN
operation is enabled.
The length of the previous frame in number of
bytes. The count sticks at 16383 for jumbo frames
larger than this value. Stops at 16383.
Asserted if the previous frame has the special
Ethernet MAC control type code
88-08 in the LT field.
Asserted if the previous frame contains an
underrun error.
Asserted if the previous frame contains a
multicast address in the destination address field.
Asserted if the previous frame contains a
broadcast address in the destination address
field.
Asserted if the previous frame is transmitted
without error.
[20:14] [26:21]
Embedded Tri-Mode Ethernet MAC User Guide
ug074_3_37_080805
UG074 (v2.2) February 22, 2010
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