
Chapter 2: Board Components 2–23
Clock Circuitry
January 2014 Altera Corporation Stratix V Advanced Systems Development Board
Reference Manual
Table 2–12 lists the oscillators, its I/O standard, and voltages required for the
development board.
Table 2–12. On-Board Oscillators (Part 1 of 2)
Source
Schematic Signal
Name
Frequency I/O Standard
Stratix V GX
FPGA1
Device Pin
Number
Stratix V GX
FPGA2
Device Pin
Number
Application
X2
MV_CLK_50
50.000 MHz
1.8-V CMOS — — MAX V System Controller
SVB_CLK_50
1.5-V CMOS
—R25
Nios II
SVA_CLK_50
R25 —
X3
CLK_CONFIG
100.000 MHz 2.5-V CMOS — —
MAX V Fast FPGA
configuration
X1
SVA_CLK_125_P
125.000 MHz
LVDS
(fan out
buffer)
AW35 —
Nios II
SVA_CLK_125_N
AY36 —
SVB_CLK_125_P
—AW35
SVB_CLK_125_N
—AY36
U50
REFCLKA_QL3_P
100.000 MHz
(BUFFER_CLKI
N_P/N or SMA)
LVDS
(fan out
buffer)
T38 —
FMC
REFCLKA_QL3_N
T39 —
SVA_CLK_P
AP10 —
General purpose
SVA_CLK_N
AR10 —
REFCLKB_QL3_P
—V39
HSMC
REFCLKB_QL3_N
—V40
SVB_CLK_P
— AP10
General purpose
SVB_CLK_N
—AR10
U91
BUFFER_CLKIN_P
100.000 MHz LVDS Buffer Input (U50)
Refer to board reference
U50
BUFFER_CLKIN_N
REFCLKA_QL2_P
644.53125 MHz LVDS
Y38 —
FMC
REFCLKA_QL2_N
Y39 —
REFCLKA_QL1_P
644.53125 MHz LVDS
AF38 —
FMC
REFCLKA_QL1_N
AF39 —
REFCLKA_QL0_P
100.000 MHz LVDS
AH39 —
PCI Express
REFCLKA_QL0_N
AH40 —
U82
CLKINTOPA_DDR3_P
100.000 MHz
(Default)
LVDS
N25 —
DDR3 top edge
CLKINTOPA_DDR3_N
M25 —
CLKINTOPA_QDR2
1.8-V CMOS B37 — QDRII+ top edge
CLKINBOTA_QDR2_P
LVDS
BB18 —
QDRII+ bottom edge
CLKINBOTA_QDR2_N
BB17 —
CLKINBOTA_DDR3_P
LVDS
BB33 —
DDR3 bottom edge
CLKINBOTA_DDR3_N
BC34 —
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