HP Digital AlphaStation 255 Family Technical Information PDF herunterladen (Seite 79)

3.2 System Power-Up Sequence

The power-up sequence is described below and illustrated in

Figure 3–1.

The RMC is responsible for the power-up sequence of the AlphaServer DS15. The general

power-up sequence follows:

1. Verify that the MLB FRU EEPROM is accessible and has a valid checksum. The

system will not be allowed to power-on unless these conditions are met (this check –

and others - can be disabled with the FEATURE_0 jumper).

2. Verify that the RMC did not detect any system problems during its power-on self-test

(this check can be overridden with the FEATURE_0 jumper).

3. Verify that the PCI Riser Card (PRC) is installed (this check can be disabled with the

FEATURE_3 jumper).

4. Assert DC Enable to the bulk power supply and wait for Power OK (POK) to assert.

5. Check the 2.5V regulator to ensure it is within specified tolerances.

6. Check to see if the disk fan is spinning. If it is and the FEATURE_4 jumper is installed,

flag a configuration error.

7. Release Titan Interrupt and General logic chip (TIG) from reset.

8. Assert power-on signal to TIG.

9. Release system from reset.

10. Wait for TIG to assert ready.

11. Wait for TIG to request 1.65V enable.

12. Assert the 1.65V VRM enable signal.

13. Wait for the 1.65V VRM Power OK signal to assert.

Power-Up Diagnostics and Display 3-3

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HP Digital AlphaStation 255 Family Technical Information Seite 79