Altera 100G Development Kit, Stratix IV GT Edition - Manual (Page 36)

2–28 Chapter 2: Board Components
Clock Circuitry
100G Development Kit, Stratix IV GT Edition Reference Manual September 2010 Altera Corporation
PLL Frequency Setup
The PLL/buffer devices (Si5338) are pre-programmed to 706.25 MHz (U21) and
100 MHz (U22, U56). These can be dynamically programmed using the clock GUI
through their I
2 C interface.
U19.4 SMA input for differential clock buffer A SMA_DIFF_CLKIN_P0
LVDS
— J21.1
U19.5 SMA input for differential clock buffer A SMA_DIFF_CLKIN_N0 — J28.1
U19.20 Differential clock buffer A to FPGA
fabric DIFFCLK_B5_P AD6 —
U19.19 DIFFCLK_B5_N AC6 —
U19.17 DIFFCLK_B6_P W6 —
U19.16 DIFFCLK_B6_N V6 —
U19.15 BUFFA3_SE_CLK_P — U14.5
U19.14 BUFFA3_SE_CLK_N — U14.6
U19.12 Differential buffer A to SMA BUFFA_DIFF_CLK_P — J22.1
U19.11 Differential buffer A to SMA BUFFA_DIFF_CLK_N — J29.1
U15.4 SMA input for reference clock buffer A SMA_REF_CLKIN_P — J6.1
U15.5 SMA input for reference clock buffer A SMA_REF_CLKIN_N — J12.1
U15.20 Reference clock buffer A to the
transceivers REFCLK_QR1_P AK43 —
U15.19 REFCLK_QR1_N AK44 —
U15.17 REFCLK_QR2_P V43 —
U15.16 REFCLK_QR2_N V44 —
U15.15 BUFFA_REF_CLK_P — J7.1
U15.14 BUFFA_REF_CLK_N — J13.1
J47.1 Reference clock SMA input to FPGA
fabric REFCLK_QR0_P BC41 —
J54.1 REFCLK_QR0_N BD41 —
J46.1 REFCLK_QR3_P F43 —
J53.1 REFCLK_QR3_N F44 —
U14.4 SMA input for single-ended clock buffer
A SE_CLKINA_SMA
2.5-V
CMOS
— J3.1
U14.23 Single-ended clock buffer A SE_CLKA_L AB6 —
U14.21 SE_CLKA_R V39 —
U14.19 SE_CLKA_MAX — U72.J6
U14.13 SE_CLKOUTA_SMA — J4.1
U13.1 644-MHz reference clock buffer CLK_644_P
LVDS
— J10.1
U13.2 644-MHz reference clock buffer CLK_644_N — J11.1
U67.2 50-MHz single-ended clock buffer to
FPGA fabric CLKIN_50_FPGA
2.5-V
CMOS
AC39 —
U67.5 50-MHz single-ended clock to MAX CLKIN_50_MAX — U72.J13
Table 2–14. Spread Spectrum Configuration DIP Switch Pin-Out (SW2) (Part 3 of 3)
Board
Reference Description
Schematic
Signal Name
I/O
Standard
Stratix IV
GT Device
Pin Name
Other
Connections