Altera Transceiver Signal Integrity Development Kit, Stratix V GX Edition - Manual (Page 49)

Chapter 2: Board Components 2–41
Power Supply
July 2012 Altera Corporation Transceiver Signal Integrity Development Kit
Stratix V GX Edition Reference Manual
Table 2–42 lists the VCCRT_GXB and VCCA_GXB voltage rails and their voltage level
depending on the switch position.
1
If the board is powered off and powered on again with SW2 in the open position, the
voltages for VCCRT_GXB and VCCA_GXB voltage rails read 0.90 V and 2.5 V respectively
and will not come up to the proper levels. This is due to the LTC2978 device trying to
adjust these rails to their programed values, which it cannot due to the switch
position of SW2. The work around to this issue is to set switch SW2 in the close
position at power up.
Table 2–43 lists the power monitor devices component reference and manufacturing
information.
Table 2–42. Voltage Level Setting
Switch (Position 1 and 2) Schematic Net Name Voltage (V)
Close (Default)
VCCRT_GXB 1.0
VCCA_GXB 3.0
Open
VCCRT_GXB 0.9
VCCA_GXB 2.5
Table 2–43. Power Measurement ADC Component References and Manufacturing Information
Board Reference Description Manufacturer
Manufacturing
Part Number
Manufacturer
Website
U10, U11
IC, power supply monitor
w/EPROM, octal PMBUS
Linear Technology LTC2978CUP#PBF www.linear.com