ADM-XRC SDK 2.5.0 User Guide (Linux)
© Copyright 2001-2005 Alpha Data
XRC | XRC-P | XRC-II-Lite | XRC-II | XPL | XP | WRC-II | DRC-II | XPI | XRC-4LX | XRC-4SX |
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$ADMXRC_SDK4/fpga/vhdl/dll
The DLL FPGA design demonstrates the clock doubling capability of Virtex DLLs and Virtex-II DCMs. The local bus clock (LCLK) is input through a clock IOB and doubled using a DLL (Virtex/-E/-EM) or DCM (Virtex-II or Virtex-IIPro). A 32-bit host-readable counter is clocked by a 2X multiple of LCLK.
Count register (COUNT, local bus address 0x0) | |||
Bits | Mnemonic | Type | Function |
31:0 | N | R/W | Number of elapsed cycles of 2X multiple of LCLK |
The COUNT register returns the number of elapsed cycles of the 2X multiple of LCLK. It can be preset to a particular value by writing to it.
For a list of the VHDL source files, refer to the appropriate XST project file, as referenced in the following table:
Model | XST script file | XST project file | UCF file |
XRC with Virtex | dll-xrc-v.scr | dll-xrc-v.prj | dll-xrc.ucf |
XRC with Virtex-E | dll-xrc-ve.scr | dll-xrc-ve.prj | dll-xrc.ucf |
XRC-P with Virtex | dll-xrcp-v.scr | dll-xrcp-v.prj | dll-xrcp.ucf |
XRC-P with Virtex-E | dll-xrcp-ve.scr | dll-xrcp-ve.prj | dll-xrcp.ucf |
XRC-II-Lite | dll-xrc2l-v2.scr | dll-xrc2l-v2.prj | dll-xrc2l.ucf |
XRC-II | dll-xrc2-v2.scr | dll-xrc2-v2.prj | dll-xrc2.ucf |
XPL | dll-xpl-v2p.scr | dll-xpl-v2p.prj | dll-xpl.ucf |
XP | dll-xp-v2p.scr | dll-xp-v2p.prj | dll-xp.ucf |
WRC-II | dll-wrc2-v2.scr | dll-wrc2-v2.prj | dll-wrc2.ucf |
DRC-II | dll-drc2-v2.scr | dll-drc2-v2.prj | dll-drc2.ucf |
XPI | dll-xpi-v2p.scr | dll-xpi-v2p.prj | dll-xpi.ucf |
XRC-4LX | dll-xrc4lx-v4lx.scr | dll-xrc4lx-v4lx.prj | dll-xrc4lx.ucf |
XRC-4SX | dll-xrc4sx-v4sx.scr | dll-xrc4sx-v4sx.prj | dll-xrc4sx.ucf |
Project Navigator projects can be found in the projnav directory as follows:
Model | Project Navigator project file |
XRC | projnav/xrc/<device> |
XRC-P | projnav/xrcp/<device> |
XRC-II-Lite | projnav/xrc2l/<device> |
XRC-II | projnav/xrc2/<device> |
XPL | projnav/xpl/<device> |
XP | projnav/xp/<device> |
WRC-II | projnav/wrc2/<device> |
DRC-II | projnav/drc2/<device> |
XPI | projnav/xpi/<device> |
XRC-4LX | projnav/xrc4lx/<device> |
XRC-4SX | projnav/xrc4sx/<device> |