Sun Microsystems Sun Blade 100, Service Manual, Page: 195 / 222

Appendix C Functional Description C-13
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Tolerance needs to keep at +3% ~ -3% with dynamic current load
of 1A to 12.5A
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85% efficiency at typical load (7A), 82% at light load (1.3A)
The voltage sensor should be routed to the farthest CPU power pin input.
Note – Since the CPU has only four VID pins, VID4 on the regulator side needs to
be tied to ground.
C.5.2.2 Power-On Beep
The M1535D SouthBridge provides a speaker output to the audio codec for output to
an internal speaker. This speaker output has two different beep functions, one is
write-beep function that will beep one to three beeps depending on the number of
writes to the register and the other is a periodic four-beep function. This is all
controlled by the software: the OpenBoot PROM must program the M1535D to send
a “beep” sound at power on.
TABLE C-4
VRM Voltage ID Codes
VID4 VID3 VID2 VID1 VID0
VDC
(output)
0 1 1 1 1 1.30
0 1 1 1 0 1.35
0 1 1 0 1 1.40
0 1 1 0 0 1.45
0 1 0 1 1 1.50
0 1 0 1 0 1.55
0 1 0 0 1 1.60
0 1 0 0 0 1.65
0 0 1 1 1 1.70
0 0 1 1 0 1.75
0 0 1 0 1 1.80
0 0 1 0 0 1.85
0 0 0 1 1 1.90
0 0 0 1 0 1.95
0 0 0 0 1 2.00
0 0 0 0 0 2.05