Alpha 1000 Uživatelská příručka stáhnout pdf (Strana 42)

2.8.2 DC Power-Up Sequence

DC power is applied to the system with the DC On/Off button on the operator

control panel.

A summary of the DC power-up sequence follows:

1. When the DC On/Off button is pressed, the power supply checks for a POK_H

condition.

2. 12V, 5V, 3.3V, and -12V outputs are energized and stabilized. If the outputs

do not come into regulation, the power-up is aborted and the power supply

enters the latching-shutdown mode.

2.9 Firmware Power-Up Diagnostics

After successful completion of AC and DC power-up sequences, the processor

performs its power-up diagnostics. These tests verify system operation, load

the system console, and test the core system (CPU, memory, and motherboard),

including all boot path devices. These tests are performed as two distinct sets of

diagnostics:

1. Serial ROM diagnostics—These tests are loaded from the serial ROM located

on the CPU daughter board into the CPU’s instruction cache (I-cache). The

tests check the basic functionality of the system and load the console code

from the FEPROM on the motherboard into system memory.

Failures during these tests are indicated by audible error beep codes. Failures

of customized SROM tests, set using the J1 jumper on the CPU daughter

board, are displayed on the operator control panel.

2. Console ﬁrmware-based diagnostics—These tests are executed by the console

code. They test the core system, including all boot path devices.

Failures during these tests are reported to the console terminal through the

power-up screen or console event log.

2.9.1 Serial ROM Diagnostics

The serial ROM diagnostics are loaded into the CPU’s instruction cache from the

serial ROM on the CPU daughter board. The diagnostics test the system in the

following order:

1. Test the CPU and backup cache located on the CPU daughter board.

2. Test the CPU module’s system bus interface.

3. Test the system bus to PCI bus bridge and system bus to EISA bus bridge. If

the PCI bridge fails or EISA bridge fails, an audible error beep code sounds.

The power-up tests continue despite these errors.

2–20 Power-Up Diagnostics and Display

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Alpha 1000 Uživatelská příručka Strana 42