Chapter 4 VXIpc 700 Series Configuration and Installation©National Instruments Corporation4-5VXIpc 800/700 Series User ManualTrigger Input TerminationYou can use jumper W12 to terminate the external trigger input SMBwith 50 Ω to ground. Figure 4-3a shows the default setting for a non-terminated trigger input SMB. Use the setting of Figure 4-3b toterminate the trigger input SMB.Figure 4-3. SMB Trigger Input TerminationEEPROMThe VXIpc-700 has an onboard EEPROM, which stores default registervalues for the VXI circuitry. These values are loaded when you powerup the computer. These values read from the EEPROM tell the PCIinterface of the VXIbus registers so that the VXI interface is ready torespond to Resource Manager accesses within the required 5 s ofSYSRST* deasserting. You can change jumper W10 to disable thispower-on self-configuration (POSC) circuit. Although this makes theVXI circuitry unusable, it is sometimes helpful in debugging addressand interrupt conflicts with add-in boards. In general, however, youshould leave W10 in its factory-default setting. Figure 4-4 shows thepossible configurations for W10.Figure 4-4. Power-On Self Configuration StatusThe EEPROM is divided into two halves; one half is factory configuredand one half is user configurable. Use jumper W7 to control theoperation of the EEPROM. The setting of this jumper determinesW12 W12a. Trigger InputUnterminated (Default)b. Terminate Trigger Inputa. VXI Circuitry Loads Power-onDefaults from EEPROM (Default)b. Power-on Self ConfigurationCircuit is DisabledW10 W10
