Altera Transceiver Signal Integrity Development Kit, Stratix V GX Edition - Manual (Page 48)

2–40 Chapter 2: Board Components
Power Supply
Transceiver Signal Integrity Development Kit July 2012 Altera Corporation
Stratix V GX Edition Reference Manual
Power Measurement
There are 6 voltage rails tied to two LTC2978 power monitor devices. These devices
are capable of measuring the voltage and current for each voltage rail. The device can
also provide power sequencing. A sense resistor at each voltage rail is in place for
these measurements. These devices are also capable of trimming the output voltage
±10%. An I
2 C bus connects to the MAX II CPLD and FPGA devices for control.
Table 2–41 lists the voltage rails. Each voltage is identified by its schematic net name.
The LTC2978 power monitor devices installed on this board are programmed with a
project file that sets up each voltage rail according to a sequence. Each voltage rail
adjusts to its voltage level to within a certain tolerance. These two voltage rails can be
adjusted through switch SW2.
ICS557-03 spread spectrum clock buffer
(x1)
3p3V 3.3
25-MHz clock output to the
FPGA
ICS8304 clock buffer 3p3V/2p5V 3.3/2.5 50-MHz clock outputs
IDT5T9306 transceiver REFCLK clock
buffers (x4)
2p5V 2.5 Programmable clock outputs
T85A23157 dual analog switch 5V 5.0 —
Character LCD 5V 5.0 —
LEDs (x13) 2p5V 2.5 —
Board power LED 5V 5.0 —
Table 2–40. Power Requirements
Device Voltage Name Voltage (V) Note
Table 2–41. Voltage Rails
Schematic Net Name Voltage (V) Description
S5GX_VCC 0.9 (1) VCC, VCCHIP, VCCHSSI FPGA core power.
VCCR_GTB 1.0 Transceiver receiver power for 28G channels.
VCCT_GTB 1.0 Transceiver transmit power for 28G channels.
VCCL_GTB 1.0 Transceiver clocking power for 28G channels.
VCCRT_GXB 0.9 or 1.0 Shared VCCR_GXB and VCCT_GXB transceiver power for 12.5G channels.
VCCA_GXB 2.5 or 3.0 Transceiver analog clock power
VCCH_GXB 1.5 Transceiver TX buffer voltage
VCCD_FPLL 1.5 FPGA core D PPL voltage
VCCPT 1.5 FPGA programmable power technology
Note to Table 2–41 :
(1) This value is based on a C1 or C2 speed grade. Voltage level for a C3 speed grade is 0.85 V.