MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
14-4 Freescale Semiconductor
14.1.3 Features
The FEC incorporates the following features:
• Support for three different Ethernet physical interfaces:
— 100-Mbps IEEE 802.3 MII
— 10-Mbps IEEE 802.3 MII
— 10-Mbps 7-wire interface (industry standard)
• Built-in FIFO and DMA controller
•IEEE 802.3 MAC (compliant with IEEE 802.3 1998 edition)
• Programmable max frame length supports IEEE 802.1 VLAN tags and priority
•IEEE 802.3 full-duplex flow control
• Support for full-duplex operation (200 Mbps throughput) with a system clock rate of 100 MHz
using the external FEC_CLK or FEC_RX_CLK
• Support for half-duplex operation (100 Mbps throughput) with a system clock rate of 50 MHz
using the external FEC_CLK or FEC_RX_CLK
• Retransmission from transmit FIFO following a collision (no system bus utilization)
• Automatic internal flushing of the receive FIFO for runts (collision fragments) and address
recognition rejects (no system bus utilization)
• Address recognition
— Frames with broadcast address may be always accepted or always rejected
— Exact match for single 48-bit individual (unicast) address
— Hash (64-bit hash) check of individual (unicast) addresses
— Hash (64-bit hash) check of group (multicast) addresses
— Promiscuous mode
• RMON and IEEE statistics
• Interrupts for network activity and error conditions
14.2 Modes of Operation
The primary operational modes are described in this section.
14.2.1 Full- and Half-Duplex Operation
Full-duplex mode is intended for use on point-to-point links between switches or end node to switch.
Half-duplex mode is used in connections between an end node and a repeater or between repeaters.
Selection of the duplex mode is controlled by TCR[FDEN].
When configured for full-duplex mode, flow control may be enabled. Refer to the TCR[RFC_PAUSE] and
TCR[TFC_PAUSE] bits, the RCR[FCE] bit, and Section 14.4.10, “Full-Duplex Flow Control,” for more
details.
Throughputs of 200 Mbps in full-duplex operations and 100 Mbps in half-duplex operations can be
attained.
14.2.2 Interface Options
The following interface options are supported. A detailed discussion of the interface configurations is
provided in Section 14.4.5, “Network Interface Options”.
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