Pll To And From Dcm; Dcm To And From Pmcd - Xilinx Virtex-5 FPGA User Manual

Chapter 2: Clock Management Technology

PLL To and From DCM

Figure 2-7
same CMT block. The PLL can drive either DCM in the same CMT block using a dedicated
connection. Similarly, the DCM can drive the PLL within the same CMT block with a
dedicated connection. There is no BUFGCTRL required between the PLL and the DCM.
X-Ref Target - Figure 2-7

DCM To and From PMCD

The PMCD block is not available in the Virtex-5 devices. However, a limited retargeting
using the PLL is possible. Refer to
Chapter 3
74
summarizes the dedicated connection between the DCM and the PLL in the
From any IBUFG implementation
From any BUFG implementation
Figure 2-7: DCM and PLL Connection in Same CMT Block
for more information.
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CLKIN
DCM1
CLKFB
PLL to DCM Input
DCM to PLL Input
CLKIN
PLL
CLKFBIN
DCM to PLL Input
PLL to DCM Input
CLKIN
DCM2
CLKFB
"PLL in Virtex-4 FPGA PMCD Legacy Mode" in
To Global
Routing (BUFG)
To Global
Routing (BUFG)
To Global
Routing (BUFG)
ug190_2_07_072307
Virtex-5 FPGA User Guide
UG190 (v5.0) June 19, 2009