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]
ML605 Hardware User Guide | www.xilinx.com | 27 |
UG534 (v1.2.1) January 21, 2010 | | |