Download DE2 Development and Education Board User Manual

Table 2–32
Temperature Sensor Pin Assignments, Schematic Signal Names, and Functions
Schematic
Signal Name
TEMPDIODEp
TEMPDIODEn
TEMP_SMCLK
TEMP_SMDAT
TEMP_INT_n
FAN_CTRL
Description
I/O Standard
Positive pin of temperature diode in
Stratix IV
Negative pin of temperature diode in
Stratix IV
SMBus clock
SMBus data
SMBus alert (interrupt)
Fan control
Stratix IV GX Pin
Number
2.5-V
PIN_A9
2.5-V
PIN_E11
1.8-V
1.8-V
1.8-V
1.8-V
PIN_AN18
PIN_AP18
PIN_AP19
PIN_AP20
2.19 Power
The DE4 Development Board has two selective power sources to choose from which include the
DC power input and the PCIe edge connector. When the DE4 is connected to the PCIe slot, an
optional 6-pin PCIe external power connector can be connected to a PC power supply in case
additional power is required on the DE4. It is recommended that users connect the PCIe external
power connector to the DE4 when either the HSMC or GPIO interface is occupied by a daughter
card. The DC voltage is stepped down to various power rails used by the components on the board
and installed into the HSMC connectors.
„ Power Switch
The slide switch (SW5) is the board power switch for the DC power input. When the slide switch is
in the ON position, the board is power on. Alternatively when the switch is in the OFF position, the
board is power off.
„ Power Measurement
There are 12 power supply rails which have on-board voltage and current sense capabilities. These
8-channel differential 24-bit ADC devices and rails are split from the primary supply plane by a
low-value sense resistor for the ADC to measure voltage and current. A SPI bus connects these
ADC devices through level shifters to the Stratix IV GX FPGA. Figure 2–29 shows the block
diagram for the power measurement circuitry.
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