Compaq AlphaServer ES40 Informations techniques Page 71

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Power-Up Diagnostics and Display 3-3
3.2
System Power-Up Sequence
The power-up sequence is described below and illustrated in
Figure 3–1.
1.
When the power cord is plugged into the wall outlet, 5V auxiliary AC
voltage is enabled. The 5 V AUX LEDs on the power supplies are lit, and
the system power controller and RMC are initialized.
2.
Pressing the Power button on the control panel or subsequently issuing the
power-on command from the RMC turns on power to the power supplies,
CPU converters, and VTERM regulators. The POK LEDs on the power
supplies are lit and the power supplies are tested. If all power supplies are
bad, power-up stops. All DC/DC converters and regulators are then tested.
If any converter or regulator is bad, power-up stops.
3.
CPU_DCOK and SYS_DC_OK are set to “true,” which means that DC power
on the CPUs and system is okay. All CPUs load the initial Y divisor (clock
multiplier). The OCP power LED is lit.
4.
SYS_RESET is set to “false.” This setting releases the system motherboard
logic and PCI backplane logic from the Reset state.
5.
The primary CPU is selected and CPU_(P)_RESET is set to “false.” This
allows the primary CPU to attempt to load flash SROM code.
6.
If the primary CPU is good, it loads flash SROM. If bad, the system tries
the next available CPU and if that CPU is good, it becomes the primary.
The remaining CPUs load flash SROM. The SROM power-up then
continues, as described in Section 3.3.
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