Altera Arria V GT FPGA Development Board - Manual (Page 80)

2–70 Chapter 2: Board Components
Power Supply
Arria V GT FPGA Development Board December 2014 Altera Corporation
Reference Manual
Power Measurement
There are 16 power supply rails that have on-board voltage, current, and wattage
sense capabilities using 24-bit differential ADC devices. Precision sense resistors split
the ADC devices and rails from the primary supply plane for the ADC to measure
voltage and current. A SPI bus connects these ADC devices to the MAX II CPLD
EPM2210 System Controller as well as the Arria V GT FPGA.
Figure 2–13 shows the block diagram for the power measurement circuitry.
Table 2–36 lists the targeted rails. The schematic signal name column specifies the
name of the rail being measured while the device pin column specifies the devices
attached to the rail. If no subnet is named, the power is the total output power for that
voltage.
Figure 2–13. Power Measurement Circuit
SCK
DSI
DSO
CSn
8 Ch.
Power Supply Load #0-14
R
SENSE
SCK
DSI
DSO
CSn
8 Ch.
EPM2210
Arria V
FPGA
LTC2418
To User PC
Power GUI
JTAG Chain
Feedback
14-pin
2x16 LCD
E
RW
RS
D(0:7)
Supply
#0-14
EPM570
USB
PHY
Embedded
USB-Blaster
Table 2–36. Power Measurement Rails (Part 1 of 3)
Switch Schematic Signal Name GUI Name Voltage Device Pin Description
1
A5A_VCCR_VCCL_GXB
A5A_XCVR_GXB
1.2V
VCCR_GXB,
VCCL_GXB XCVR analog receive and clock
network
A5A_VCCT_GXB 1.2V VCCT_GXB XCVR transmitter power
2 A5A_VCCA_2.5V A5A_VCCA
2.5V VCCA_FPLL PLL analog power
2.5V
VCC_AUX,
VCCA_GXB
Auxiliary