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34 www.xilinx.com PCI v3.0.151 Getting Started Guide
UG157 August 31, 2005
Chapter 3: Family Specific Considerations
R
Bus Clock Usage
The bus clock output provided by the interface is derived from the bus clock input, and is
distributed using a global clock buffer. The interface itself is fully synchronous to this
clock. In general, the portion of the user application that communicates with the interface
must also be synchronous to this clock.
It is important to note that the frequency of this clock is not guaranteed to be constant. In
fact, in a compliant system, the clock may be any frequency, up to and including the
FF668
LX15 2
LX25 4
LX40 2
LX60 2
FX12 2
SX25 2
SX35 4
FF1148
LX40 4
LX60 4
LX80 6
LX100 6
LX160 6
SX55 4
FF1513
LX100 8
LX160 8
LX200 8
FF672
FX20 2
FX40 none
FX60 none
FF1152
FX40 4
FX60 4
FX100 4
FF1517
FX100 6
FX140 6
FF1760 FX140 8
Table 3-4: Virtex-4 Device and Package 64-bit Interfaces
Package Device 64-bit Interfaces