Altera Cyclone IV GX Transceiver Starter Board - Manual (Page 36)

2–28 Chapter 2: Board Components
Power Supply
Cyclone IV GX Transceiver Starter Board Reference Manual © March 2010 Altera Corporation
Power Measurement
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.
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.
Figure 2–8. Power Measurement Circuit
SCK
DSI
DSO
CSn
8 Ch.
Power Supply Load #N
Supply
#N R
SENSE
MAX II CPLD
EPM2210
System
Controller
MAX II CPLD
EPM240M100
USB
PHY
To User PC
Power GUI
JTAG Chain
Embedded
USB-Blaster
Feedback
Power Supply Load #0
Supply
#0
R
SENSE
Feedback
Table 2–33. Power Rails Measurement Based on the Rail Selected in the Power GUI
Rail Schematic Signal Name Voltage (V) Device Pin Description
1 2.5_VCC 2.5 VCCA FPGA PLL analog power
2.5 VCC_CLKIN V
IO
clock input pins
2 1.2_VCCL_GXB 1.2 VCCL_GXB Transceiver physical medium attachment
(PMA) and auxiliary power
3 2.5_VCC_GXB 2.5 VCCH_GXB Transceiver output buffer power
2.5 VCCA_GXB Transceiver PMA power
4 2.5_VCCIO 2.5 VCCIO FPGA I/O bank power
5 1.2_VCCINT 1.2 VCCINT FPGA core voltage and PCI Express hard IP
block power
6 1.2_VCCD_PLL 1.2 VCCD_PLL FPGA PLL digital power