Answers Database
LogiCORE PCI: Does the XC4000E meet capacitance and inductance specs for PCI?
Record #1242
Product Family: Hardware
Product Line: 4000E
Product Part: 4000E
Problem Title:
LogiCORE PCI: Does the XC4000E meet capacitance and inductance specs for PCI?
Problem Description:
Urgency: Standard
General Description:
Please refer to the PCI Compliance Checklist (for XC4000E)
for a complete evaluation of PCI specs. This solution record
addresses the specs not defined by the checklist and addresses
discrepancies with the databook.
The PCI spec requires a capacitance on IDsel of less than 8 pF.
The XC4000E databook specifies that the capacitance is less
than 10pF. The maximum inductance on any pin is required
by the spec to be less than 20nH. This value is not defined in
the XC4000E databook.
Solution 1:
The XC4000E is compliant with the PCI spec, Cid_sel < 8pF.
The data book number is a conservative value associated with the
relatively high capacitance on pins in CERAMIC packages.
Any PQFP package will be less than 8pF. Please refer to the PCI
Compliance Checklist for a complete list of PCI compliant
package types.
Although Xilinx does not specify a maximum pin inductance
parameter, simulation modeling (SPICE) has shown that devices
in the XC4000E family exhibit inductance of less than 20nH.
These devices are compliant with the spec. Difficulty in
measuring inductance permits only simulation data availability.
End of Record #1242 - Last Modified: 02/23/99 10:05 |
