Features For Fiber And Copper Mode; Padding Of Undersized Frames On Transmit; Automatic Crc Generation; Filtering Of Receive Packets - Intel IXF1104 Datasheet

®
Intel IXF1104 4-Port Gigabit Ethernet Media Access Controller
packets. CRC is removed optionally from receive packets after validation, and is not forwarded to
SPI3. Packets with a bad CRC are marked, counted in the statistics block, and may be optionally
dropped. A bad packet may be signaled with RERR on the SPI3 interface if it is not dropped.
The IXF1104 MAC operates only in full-duplex mode at 1000 Mbps rates on both SerDes and
GMII interface connections. The IXF1104 MAC is capable of operation at 1000 Mbps, full-duplex
in RGMII mode, and at full-duplex and half-duplex operation for 10/100 Mbps links.
5.1.1

Features for Fiber and Copper Mode

Section 5.1.1.1
line-side interface.
5.1.1.1

Padding of Undersized Frames on Transmit

The padding feature allows Ethernet frames smaller than 64 bytes to be transferred from the SPI3
interface to the TX MAC and padded up to 64 bytes automatically by the MAC. This feature is
enabled by setting bit 7 of the
Note: When the user selects the padding function, the MAC core adds an automatically calculated CRC
to the end of the transmitted packet.
5.1.1.2

Automatic CRC Generation

Automatic CRC Generation is used in conjunction with the padding feature to generate and append
a correct CRC to any transmit frame. This feature is enabled by setting bit 6 of the
Write ($ Port_Index +
5.1.1.3

Filtering of Receive Packets

This feature allows the IXF1104 MAC to filter receive packets under various conditions and drop
the packets through an interaction with the Receive FIFO control.
5.1.1.3.1
This feature is enabled when bit 0 of the
Any frame received in this mode that does not match the Station Address (MAC address) is marked
by the IXF1104 MAC to be dropped. The frame is dropped if the appropriate bit in the
Errored Frame Drop Enable ($0x59F)"
may optionally be signaled with an RERR (see bit 0 in
page 215).
When bit 0 of the
out the SPI3 interface.
Note: The VLAN filter overrides the unicast filter. Therefore, a VLAN frame cannot be filtered based on
the unicast address.
67
through Section 5.1.1.4 cover IXF1104 MAC functions that are independent of the
"Diverse Config Write ($ Port_Index +
0x18)".
Filter on Unicast Packet Match
= 1. Otherwise, the frame is sent out the SPI3 interface and
"RX Packet Filter Control ($ Port_Index + 0x19)"
"RX Packet Filter Control ($ Port_Index + 0x19)"
"SPI3 Receive Configuration ($0x701)" on
0x18)".
"Diverse Config
= 1.
"RX FIFO
= 0, all unicast frames are sent
Datasheet
Document Number: 278757
Revision Number: 009
Revision Date: 27-Oct-2005