20
Virtex-4 ML455 PCI/PCI-X Board
UG084 (v1.0) May 17, 2005
Chapter 3:
Hardware Description
R
Power Consumption
The PCI specification outlines the power consumption limitations for PCI add-in boards.
The maximum allowable power consumption across all power rails (+5V, +3.3V, +12V,
-12V) is 25W.
On the PCI connector two signals allow the power demand of a board to be specified.
The PRSNT[1:2]# signals are used by a system board to detect if an add-in card is
physically present in the slot and the total power requirements of the add-in card. The
signals are required for the add-in card but are optional for the system board. The ML455
board uses the EDGE_PRSNT1# and EDGE_PRSNT2# signals to request the maximum
25W power limit by grounding PRSNT1# and leaving PRSNT2# open. The
SKT_PRSNT[1:2]# signals on the PCI-X expansion socket (J1) are routed to the FPGA for
sensing.
A board plugged into the top-mounted PCI connector J1 should be configured to request
no more than 15W.
Voltage Regulators
The ML455 board is powered from the PCI slot that it is plugged into, utilizing the +5V and
the +3.3V power rails (see
for the specific power pins within the PCI edge
connector pinout).
The ML455 board on-board power rails are 5.0V, 3.3V, 3.0V, 2.5V, 1.8V, 1.2V, and 1.25V.
lists the voltages.
test6
LCD_DATA3
8
P19
test7
LCD_DATA2
9
T24
test8
LCD_DATA1
10
T23
test9
LCD_DATA0
11
T26
test10
LCD_EN
12
U26
test11
LCD_RD_WR_B
13
U23
test12
LCD_REGSEL
14
V23
test13
LCD_RESET_B
15
T21
test14
LCD_CS_B
16
T20
test15
not used
17
V26
test16
not used
18
V25
Table 3-8:
General-Purpose Header P11
(Continued)
Signal Name
P11 Pin #
FPGA Pin #
GP Mode
LCD Mode
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