VSC8634/VSC8664 Evaluation Board
VPPD-03084 VSC8634/VSC8664 User Guide Revision 1.1
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4.4.2
Fiber Media Operation (100BASE-FX)
To set the device in 100BASE-FX mode perform the following:
Set up the Copper traffic source (i.e., an IXIA or Smartbits box).
Connect an SFP module and fiber to SFP Port 0.
Write “MII Register” (PHY 0) 23’d 0x0304 (Sets Fiber Media to 100FX Mode).
Write “MII Register” (PHY0) 0’d 0x9040 (Software Reset for media mode setting to have effect).
Write “MII Register” (PHY 0) 23’d by setting bit 3 to “1” (activate Far-end loopback) if necessary.
Write “MII Register” (PHY0) 0’d 0x0004 (Disable Auto Neg.) if necessary.
4.4.3
Fiber Media Operation (1000BASE-X)
To run traffic through the VSC8664’s fiber port, simply loopback the MAC side using coax cables,
connect the media side to a traffic source, configure the device registers as indicated below and watch
traffic traverse the PHY. An internal loopback known as far end loopback can be configured instead of
using coax cables.
Set up the Copper traffic source (i.e., an IXIA or Smartbits box).
Connect an SFP module and fiber to SFP Port 0.
Write “MII Register” (PHY 0) 23’d 0x0204 (Sets Media Mode).
Write “MII Register” (PHY0) 0’d 0x9040 (Software Reset for media mode setting to have effect).
Write “MII Register” (PHY 0) 23’d by setting bit 3 to “1” (activate Far-end loopback) if necessary.
Write “MII Register” (PHY0) 0’d 0x0004 (Disable Auto Neg if necessary).
Traffic should be flowing.
4.4.4
Using the GUI
Double-click on “MII Registers” on Figure 3 and the window shown in Figure 4 should appear:
