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ML310 User Guide www.xilinx.com 59
UG068 (v1.01) August 25, 2004 1-800-255-7778
Board Hardware
R
Note: An Antec, model SL250S, ATX Power Supply is delivered with your ML310. The Antec User’s
Manual is provided in the Data sheets section on the ML310 CDROM. Prior to installation please read
the Installation section of the Antec User’s Manual which describes the red voltage switch power
setting on your Antec SL250S supply.
Check the red power supply voltage switch setting before installation. It should be the
same as your local power voltage (115V for North America, Japan, etc. and 230V for
Europe and many other countries). Change the voltage setting if necessary. Failure to take
this precaution could result in damage to your equipment and could void your warranty.
The ML310 requires a variety of voltages as is required by the different logic devices used
in the ML310 board design. The varieties of voltages are derived from the 5.0V supply and
regulated on board as shown in Figure 2-17.
Figure 2-17 shows the power distribution and regulation for the ATX-compatible power
supply.
Several voltage monitors, MC34161D, monitor all regulated power on the ML310 board.
Each of the voltage monitors is connected to power indicator LEDs as shown in
Figure 2-18. The indicator LEDs will illuminate RED if a regulated supply voltage is out of
spec and will illuminate Green if the regulated supply voltage is nominal. Each regulated
supply voltage has a corresponding test point located near its indicator LED. Please review
the ML310 schematics and the MC34161D data sheet for more detailed information.
Figure 2-17: ATX Power Distribution and Voltage Regulation
VCC5V
VCC12V_N
VCC12V_P
VCC3V3
R185-188
Nostuff
VCC3V3_ATX
J18
VCC12V_P
AC_AVDD
(5.0V @ 500mA)
U3
LT1763CS8
MGT_AVCC
(2.5V @ 3A)
U40
LT1764AEQ
MGT_VTT
(1.8V @ 500 mA)
U34
LT1763CS8
DDR_VTT
(1.25 V @ 3A)
U25
ML655460
VREF_DDR
VCC3V3
USB_AVC
(5V @ 500 mA)
U9
MIC2076-2
VCC3_PCI
(3.0V @
500mA)
U41
LT1763CS8
VCC3V3
(3.3V @ 10A)
U14
SC10A-DAC
VCC2V5
(2.5V @ 10A)
U10
SC10A-DAC
VCC1V5
(1.5V @
10A)
U8
SC10A-DAC
VCC5V
Pin 1 Pin 11
3.3-A
3.3-B
COM-A
5V-A
COM-B
5V-B
COM-C
PW-OK
5VSB
12V
3.3-C
-12V
COM-D
PS-ON
COM-E
COM-F
COM-G
-5V
5V-C
5V-D
NOTE: Typical ATX power supplies may not
produce a well-regulated 3.3V supply unless
there is a minimum load on the 5V output.
Therefore 3.3V is regulated separately for
on-board use.
NOTE: These resistors (R185-188) allow the 3.3v regulator
to be nostuffed and 3.3v power taken directly from the ATX
supply in the case where it is well-behaved given the load
on the other outputs.