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ML605 Hardware User Guide www.xilinx.com 27
UG534 (v1.2.1) January 21, 2010
Detailed Description
The JTAG chain can be used to program the FPGA and access the FPGA for hardware and
software debug.
The JTAG connector (USB Mini-B J22) allows a host computer to download bitstreams to
the FPGA using the Xilinx iMPACT software tool. In addition, the JTAG connector allows
debug tools such as the ChipScope™ Pro Analyzer tool or a software debugger to access
the FPGA. The iMPACT software tool can also program the BPI flash via the USB J22
connection. iMPACT can download a temporary design to the FPGA through the JTAG.
This provides a connection within the FPGA from the FPGA's JTAG port to the FPGA's BPI
interface. Through the connection made by the temporary design in the FPGA, iMPACT
can indirectly program the BPI flash or the Platform Flash XL from the JTAG USB J22
connector.
For an overview on configuring the FPGA, see “Configuration Options,” page 73.
7. Clock Generation
There are three FPGA fabric clock sources available on the ML605.
Oscillator (Differential)
The ML605 has one 2.5V LVDS differential 200 MHz oscillator (U11) soldered onto the
board and wired to an FPGA global clock input.
• Crystal oscillator: Epson EG-2121CA-200.0000M-LHPA
• PPM frequency jitter: 50 ppm
For more details, see the Epson EG-2121CA data sheet. [Ref 25].
Oscillator Socket (Single-Ended, 2.5V)
One populated single-ended clock socket (X5) is provided for user applications. The option
of 3.3V or 2.5V power may be selected via a 0 ohm resistor selection. The X5 socket is
populated with a 66 MHz 2.5V single-ended MMD Components MBH2100H-66.000 MHz
oscillator.
For more details, see the MMD Components MBH Series Data Sheet. [Ref 26]