Power Measurement - Altera Cyclone IV GX Reference Manual

2–28

Power Measurement

Figure 2–8. Power Measurement Circuit
Supply
#0
Supply
#N
Table 2–33. Power Rails Measurement Based on the Rail Selected in the Power GUI
Rail
1
2.5_VCC
2
1.2_VCCL_GXB
3
2.5_VCC_GXB
4
2.5_VCCIO
5
1.2_VCCINT
6
1.2_VCCD_PLL
Cyclone IV GX Transceiver Starter Board Reference Manual
Downloaded from Elcodis.com electronic components distributor
There are six power supply rails which have on-board voltage and current sense
capabilities. The power supply rails are split from the primary supply plane by a
low-value sense resistor for the 8-channel differential input 24-bit ADC device to
measure voltage and current. A SPI bus connects the ADC device to the MAX II CPLD
EPM2210 System Controller as well as the Cyclone IV GX Transceiver.
Figure 2–8 shows the block diagram for the power measurement circuitry.
Feedback
R
SENSE
Feedback
R
SENSE
Table 2–33 lists the targeted rails. The schematic signal name column specifies the
name of the rail being measured and 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.
Schematic Signal Name Voltage (V)
Power Supply Load #0
Power Supply Load #N
8 Ch.
SCK
DSI
DSO
CSn
Device Pin
2.5 FPGA PLL analog power
VCCA
2.5 V
VCC_CLKIN
1.2 Transceiver physical medium attachment
VCCL_GXB
(PMA) and auxiliary power
2.5 Transceiver output buffer power
VCCH_GXB
2.5 Transceiver PMA power
VCCA_GXB
2.5 FPGA I/O bank power
VCCIO
1.2 FPGA core voltage and PCI Express hard IP
VCCINT
block power
1.2 FPGA PLL digital power
VCCD_PLL
Chapter 2: Board Components
Embedded
USB-Blaster
USB
MAX II CPLD
EPM240M100 PHY
JTAG Chain
MAX II CPLD
EPM2210
System
Controller
Description
clock input pins
IO
© March 2010 Altera Corporation
Power Supply
To User PC
Power GUI