HW-V5-ML501-UNI-G【PDF 27/42 页】EVALUATION PLATFORM VIRTEX-5

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Detailed Description

17. System ACE and CompactFlash Connector

The Xilinx System ACE CompactFlash (CF) configuration controller allows a Type I

CompactFlash card to program the FPGA through the JTAG port. Both hardware and

software data can be downloaded through the JTAG port. The System ACE controller

supports up to eight configuration images on a single CompactFlash card. The

configuration address switches allow the user to choose which of the eight configuration

images to use.

The CompactFlash card shipped with the board is correctly formatted to enable the

System ACE CF controller to access the data stored in the card. The System ACE CF

controller requires a FAT16 file system, with only one reserved sector permitted, and a

sector-per-cluster size of more than one (UnitSize greater than 512). The FAT16 file system

supports partitions of up to 2 GB. If multiple partitions are used, the System ACE directory

structure must reside in the first partition on the CompactFlash, with the xilinx.sys file

located in the root directory. The xilinx.sys file is used by the System ACE CF

controller to define the project directory structure, which consists of one main folder

containing 8 sub-folders used to store the 8 ACE files containing the configuration images.

Only one ACE file should exist within each sub-folder. All folder names must be compliant

to the DOS 8.3 short filename format. This means that the folder names can be up to eight

characters long, and cannot contain the following reserved characters: < > “ / | . This

DOS 8.3 filename restriction does not apply to the actual ACE file names. Other folders and

files may also coexist with the System ACE CF project within the FAT16 partition.

However, the root directory must not contain more than a total of 16 folder and/or file

entries, including deleted entries.

When ejecting or unplugging the CompactFlash device, it is important to safely stop any

read or write access to the CompactFlash device to avoid data corruption. If the

CompactFlash file system becomes corrupted, a copy of the original demonstration image

(as shipped with the board), as well as instructions for re-imaging the CompactFlash card

to restore the original demonstration image are available online. See CompactFlash Re-

Imaging Instructions at http://www.xilinx.com/products/boards/ml501/images.htm .

Within the demonstration image, Configuration Image 6 (cfg6) My Own ACE File is reserved

as a placeholder to be replaced by a user design. After creating a new ACE file, the ACE file

can be copied from your computer to the ML50 x \cfg6 directory on the CompactFlash card

using a CompactFlash programmer (USB CompactFlash reader/writer devices or PC card

adapters are available at computer stores). For step-by-step instructions on how to create a

new ACE file from an FPGA bitstream (and ELF file) using XMD and the genace.tcl

script, See the My Own ACE File section in the ML501 Getting Started Tutorial [Ref 10] as

well as the Stand-Alone Software Applications section in the ML501 Reference Design User

Guide [Ref 11] .

System ACE error and status LEDs indicate the operational state of the System ACE

controller:

?

?

?

?

A blinking red error LED indicates that no CompactFlash card is present

A solid red error LED indicates an error condition during configuration

A blinking green status LED indicates a configuration operation is ongoing

A solid green status LED indicates a successful download

Every time a CompactFlash card is inserted into the System ACE socket, a configuration

operation is initiated. Pressing the System ACE reset button re-programs the FPGA.

ML501 Evaluation Platform

UG226 (v1.4) August 24, 2009

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