Embedded Solutions
Page 10
Switch 2,1 – Selects protocol used for initial configuration and/or register access
OO
SMBus with ARP (Address Resolution Protocol)
OC
SMBus without ARP
CX
I2C (default setting)
Switch 3 – Enables/Disables use of I2C/SMBus for initial PCIe Switch configuration.
O
I2C/SMBUS NOT used for initial configuration (default setting)
C
I2C/SMBUS is used for initial configuration.
Note: EEPROM can be used with either setting.
Switch 4 – 25MHZ VPX REFCLK Enable
O
25MHZ VPX REFCLK Enabled/ON
C
25MHZ VPX REFCLK Disabled/OFF
Switch 5 – PCIe Switch Upstream port clock select
O
Upstream port uses PCIe REFCLK from PCIe connector (default setting)
C
Upstream port uses 100MHz NSSC generated on board
Switch 6 – PCIe Switch Downstream port clock select
O
Downstream port uses 100MHz SSC generated from 25MHZ VPX REFCLK
C
Downstream port uses 100MHz NSSC generated on board
Switch 7 – Enables/Disables copy of 100MHz SSC to be output on SMA connectors
O
SSC is NOT output on SMA Connectors J10 and J11
C
Copy of 100MHz SSC is output on SMA Connectors J10 and J11
Switch 8 – Enables/Disables copy of 100MHz NSSC to be output on SMA connectors
O
NSSC is NOT output on SMA Connectors J7 and J8
C
Copy of 100MHz NSSC is output on SMA Connectors J7 and J8
