Altera High-Speed Development Kit, Stratix GX Edition - Manual (Page 135)

Altera Corporation Quartus II Version 3.0 9–1
9. 10-Gigabit Ethernet MAC
Demonstration
Introduction This demonstration application implements a 10-Gigabit Ethernet MAC
connected to the Stratix GX embedded SERDES device, providing an
XAUI connection to an optional XPAK optical transceiver
module. The demonstration allows you to test the XAUI SERDES
implementation with Ethernet LAN bandwidth.
The demonstration provides the Ethernet MAC with 2-Kbytes of FIFO
buffers per direction, implementing a store-and-forward mechanism to
transfer received frames back to the transmit port. Statistics are collected
on the traffic received. A small, integrated Nios processor accesses these
statistics and presents them on a standard RS-232 terminal. Table 9–1
shows the configuration for the Ethernet MAC core used in the
demomstration.
Table 9–1. 10G Ethernet MAC Core Configuration (Part 1 of 2)
Parameter Setting Notes
Transmit FIFO
buffer 256 deep x 64 wide
(2 Kbytes) Can hold standard Ethernet frame.
Transmit FIFO
buffer section
thresholds 0 The TX FIFO buffer is configured in store-and-forward mode.
Transmission begins after a complete frame is available in the
transmit FIFO buffer.
Receive FIFO buffer 256 deep x 64 wide
(2Kbyte)
Can hold complete standard Ethernet frame.
Receive FIFO buffer
section available 32 (256 byte) The RX FIFO buffer is configured to forward frames to the transmit
FIFO buffer without waiting for end-of-frame if the frame exceeds
256 bytes. If less than 256 byte frames are received, the frame is
forwarded with reception of end-of-frame.
RX FIFO threshold
for automatic pause
frame generation 128 (1024 byte) As the RX FIFO buffer is programmed in forwarding mode, it usually
will not reach this limit and the MAC operates normally.To force the
receive FIFO buffer to fill up, the transmitter can be put on hold by
generating a pause frame from the Testset.
Pause quanta 32767 If the MAC transmits pause frames, the pause quanta is set to this
value.
MAC address Disabled MAC address recognition and insertion is disabled. All frames
received are forwarded unmodified.
CRC remove on
receive Enabled The received frame CRC is verified and removed from the frame.