XAUI to SFP+ Module 10G Channel-to-Channel Optical Loopback
This design tests the dual XAUI to SFI interface using the Stratix IV GX FPGA Dev Kit platform.
The Stratix IV GX transmits 3.125G XAUI signals on the four lanes of channel 1 and the return
signal is received on channel 2. Also, the Stratix IV GX transmits 3.125G XAUI signals on the four
lanes of channel 2 and the return signal is received on channel 1. The Stratix IV GX FPGA sends a
3.125G XAUI signal on four transmit lanes from channel 1 to the BCM8727 device, which then
outputs a 10G signal to the SFP+ module on channel 1. With an SFP+ module and optical cable
installed, as shown in
, the SFP+ sends an optical 10G signal from SFP+ channel 1
output to SFP+ channel 2 input. The SFP+ module converts the 10G optical signal into an electrical
10G signal and sends it to the BCM8727 PHY. The PHY then converts the 10G signal into four
3.125G XAUI output signals and transmits them on channel 2 to the Stratix IV GX device through
the HSMC connector. The same process is followed for the channel 2 transmitter to channel 1
receiver.
Figure 5-2 XAUI to SFP+ Channel-to-Channel Loopback Test Setup
XAUI to SFP+ Module 10G Channel-to-Channel Loopback Test Design Procedure
(The same steps are followed for the Channel Loopback test above, except to Step 20)
1) Set USER_DIPSW[7:0] = [00000100] -- Flip XAUI Lanes
2) Plug in the Dual XAUI to SFP+ HSMC into the HSMA port on the Stratix IV GX FPGA
development
3) Plug in SFP+ modules into each SFP+ port on the Dual XAUI to SFP+ HSMC
4) Plug in two 10G Optical Loopback cables compatible with the SPF+ modules
5) Power on the Stratix IV GX FPGA development kit board
6) Program the Stratix IV GX FPGA development kit with the "hsmc_loopback.sof"
On the Stratix IV GX FPGA development kit:
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