PLB PCI Full Bridge (v1.00a)
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DS508 March 21, 2006
Product Specification
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The parameter C_IDELAYCTRL_LOC has the syntax of IDELAYCTRL_XNYM where N and M are
coordinates and multiple entries are concatenated by "-" (i.e., dash). The order of entries correspond to
IDELAYCNTRL instance names XPCI_IDC0, XPCI_IDC1, ... up to the maximum index of IDELAY
controller instances in the user’s board design. The maximum index is C_NUM_IDELAYCTRL-1. To
use the parameter to set the LOC constraint in the core level ucf-file for the above example, the
parameter should be set in the MHS-file as shown below.
PARAMETER C_IDELAYCTRL_LOC="IDELAYCTRL_X2Y5-IDELAYCTRL_X2Y6"
The quotes are optional. The actual number of IDELAYCTRL primitives and corresponding LOC
constraints depends on the user’s PCI pinout and part used.
Other constraints that are required include the IOBDELAY_TYPE, IOBDELAY_VALUE and IOB. These
parameters are set in the normal EDK tool flow, but can be included in the system top-level ucf-file. For
alternative tool flows, the setting are shown below. The settings shown below are settings at the time
this document was written. The LogiCORE v3 PCI core Implementation Guide and v3.0 core ucf
generator tool should be checked for updated values. IOSTANDARD must be explicitly defined in the
ucf-file with the BYPASS constraint for ISE 8.1 tools; this can change in with future versions of the tools.
#-------------------------------------------------------------------------
# Virtex-4 Only Constraints
#-------------------------------------------------------------------------
INST "*XPCI_CBD*" IOBDELAY_TYPE=VARIABLE ;
INST "*XPCI_ADD*" IOBDELAY_TYPE=VARIABLE ;
INST "*PCI_CORE/XPCI_PARD" IOBDELAY_TYPE=VARIABLE ;
INST "*PCI_CORE/XPCI_FRAMED" IOBDELAY_TYPE=VARIABLE ;
INST "*PCI_CORE/XPCI_TRDYD" IOBDELAY_TYPE=VARIABLE ;
INST "*PCI_CORE/XPCI_IRDYD" IOBDELAY_TYPE=VARIABLE ;
INST "*PCI_CORE/XPCI_STOPD" IOBDELAY_TYPE=VARIABLE ;
INST "*PCI_CORE/XPCI_DEVSELD" IOBDELAY_TYPE=VARIABLE ;
INST "*PCI_CORE/XPCI_PERRD" IOBDELAY_TYPE=VARIABLE ;
INST "*PCI_CORE/XPCI_SERRD" IOBDELAY_TYPE=VARIABLE ;
#Include next 2 if routed to pins
INST "*XPCI_IDSEL" IOBDELAY_TYPE=VARIABLE ;
INST "*XPCI_GNTD" IOBDELAY_TYPE=VARIABLE ;
INST "*XPCI_CBD*" IOBDELAY_VALUE=55 ;
INST "*XPCI_ADD*" IOBDELAY_VALUE=55 ;
INST "*PCI_CORE/XPCI_PARD" IOBDELAY_VALUE=55 ;
INST "*PCI_CORE/XPCI_FRAMED" IOBDELAY_VALUE=55 ;
INST "*PCI_CORE/XPCI_TRDYD" IOBDELAY_VALUE=55 ;
INST "*PCI_CORE/XPCI_IRDYD" IOBDELAY_VALUE=55 ;
INST "*PCI_CORE/XPCI_STOPD" IOBDELAY_VALUE=55 ;
INST "*PCI_CORE/XPCI_DEVSELD" IOBDELAY_VALUE=55 ;
INST "*PCI_CORE/XPCI_PERRD" IOBDELAY_VALUE=55 ;
INST "*PCI_CORE/XPCI_SERRD" IOBDELAY_VALUE=55 ;
#Include next 2 if routed to pins
INST "*XPCI_IDSEL" IOBDELAY_VALUE=55 ;
INST "*XPCI_GNTD" IOBDELAY_VALUE=55 ;
Some of the Virtex-4 constraints are implemented automatically in the EDK tool flow with any tool
option that invokes bridge synthesis. As described earlier, tcl-scripts generate the ucf-file constraints
and place them in a file in the OPB PCI Bridge directory of the project implementation directory. The
ucf-file constraints are then included in the ngc-file generated in the EDK tool flow. The user can check
