Altera Stratix II GX EP2SGX90 Transceiver Signal Integrit Manual do Utilizador descarregar pdf (Página 34)

2–24 Reference Manual Altera Corporation

Stratix II GX EP2SGX90 Transceiver Signal Integrity Development Board May 2006

Interfaces

Table 2–16 lists the spread spectrum output selection DIP switch settings.

Table 2–17 lists PCIe clock and quad transceiver clock DIP switch

settings.

1 Switches 7 and 8 are not connected.

Clock Selection Switches (S9 and S10)

Switch S9 is used to control whether the clock input is driven from an

external or an on-board source. Switch S10 is used to apply power to the

board. The positions for these switches are labelled on the silk-screen.

Table 2–18 lists clock selection switch settings for board reference S9.

Table 2–16. Spread Spectrum Output Selection Setting (S8)

Switch Center =/-0.25 Down -0.5 Down -0.75 No Spread

SW3 Closed Open Closed Open

SW4 Closed Closed Open Open

Table 2–17. PCIe Clock & Quad Transceiver Clock DIP Switch Settings (S8)

PCIe Clock DIP Switch Setting Quad Transceiver Clock DIP Switch Setting

Switch Enable Clock Disable Clock Switch Enable Clock Disable Clock

SW5 Open Closed SW6 Open Closed

Table 2–18. Clock Selection Switch (S9)

Switch Setting Result

Switch in OSC setting Selects the 156.25-MHz oscillator

Switch in SMA position Selects external clock input

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Altera Stratix II GX EP2SGX90 Transceiver Signal Integrit Manual do Utilizador Página 34