Oscillators And Clocks - Digilent NetFPGA-1G-CML Reference Manual

NetFPGA-1G-CML™ Board Reference Manual
The Xilinx Kintex-7 Data Sheet: DC and AC Switching Characteristics (DS182) provides more information on the
power supply requirements of the FPGA board.
Supply Derived From
5.0 V 12.0 V
3.3 V 12.0 V
2.0 V 5.0 V
1.8 V 12.0 V
1.8 V 3.3 V
1.5 V 12.0 V
1.2 V 12.0 V
1.0 V 12.0 V
1.0 V 3.3 V
0.9 V 3.3 V
0.75 V 3.3 V
VADJ 12.0 V
3

Oscillators and Clocks

On-board oscillators support various board subsystems. A low-jitter 125 MHz oscillator is provided for the Ethernet
PHYs and a 50 MHz oscillator drives the FPGA master configuration clock. The Cypress FX2LF and Microchip PIC
microcontroller each contain on-chip oscillators running at 24 MHz and 8 MHz, respectively.
The main FPGA system clock is provided by an ultra-low-jitter 200 MHz differential oscillator connected to pins
AA2 and AA3 in I/O bank 34. This can drive up to ten internal PLLs (Phase Locked Loops) and MMCMs (Mixed-
Mode Clock Managers) on the FPGA for high-performance multi-clock-domain designs. Please refer to the Xilinx 7-
Series Clock Resources User Guide (UG472) for more details on FPGA internal clocking resources.
4 FPGA Memory
The XC7K325T FPGA includes 445 on-chip Block RAMs (BRAMs) of 36Kb, or 4096 bytes with two-bit error
correction, which amounts to a total of 1.78 MB of on-chip, error-corrected static RAM that can be used for a
variety of purposes ranging from program storage for deeply embedded "bare metal" applications to data
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USB HID; FMC
SD Card; Ethernet PHYs; Cypress FX2LP; Microchip PIC; BPI
Flash; FPGA I/O Banks 14,15; FMC; PMODs
FPGA auxiliary supply, VCC
backup.
QDRII+ supply
FPGA GTX transceiver Quad PLL
DDR3; FPGA I/O Bank 34
FPGA GTX transceiver termination
FPGA GTX analog supply
FPGA Core
QDRII+ reference
DDR3 reference
FPGA I/O Banks 12, 13; FMC; Configurable.
SET_VADJ2 SET_VADJ1
FPGA AF20 FPGA AF19
0 0
0 1
1 0
1 1
Table 1. On-board power supplies.
Application
; Backup battery; Real-time clock
BAT
VADJ
1.2 V
1.8 V
2.5 V
3.3 V
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