XC4VFX100-11FFG1152C Xilinx Inc, XC4VFX100-11FFG1152C Datasheet - Page 105
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XC4VFX100-11FFG1152C
Manufacturer Part Number
XC4VFX100-11FFG1152C
Description
IC FPGA VIRTEX-4FX 100K 1152FBGA
Manufacturer
Xilinx Inc
Series
Virtex™-4r
Specifications of XC4VFX100-11FFG1152C
Number Of Logic Elements/cells
94896
Number Of Labs/clbs
10544
Total Ram Bits
6930432
Number Of I /o
576
Voltage - Supply
1.14 V ~ 1.26 V
Mounting Type
Surface Mount
Operating Temperature
0°C ~ 85°C
Package / Case
1152-BBGA, FCBGA
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Number Of Gates
-
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Part Number:
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Virtex-4 FPGA User Guide
UG070 (v2.6) December 1, 2008
Connecting PMCD to other Clock Resources
R
IBUFG to PMCD
DCM to PMCD
BUFGCTRL to PMCD
Figure 3-6
In most applications, the PMCD is used with other clock resources including dedicated
clock I/O (IBUFG), clock buffers (BUFGCTRLs), DCMs, and an MGT clock. Additionally,
PMCD inputs and outputs can be connected to the general interconnects. This section
provides guidelines on connecting a PMCD to clock resources using dedicated routing.
Virtex-4 devices contain 16 or 32 global clock I/Os. These clock I/Os are accessible by
instantiating the IBUFG component. Each top and bottom half of the center column
contains eight or 16 IBUFGs. Any of the IBUFGs in the top or bottom half can drive the
clock input pins (CLKA, CLKB, CLKC, or CLKD) of a PMCD located in the same
top/bottom half. The routing from multiple IBUFGs to PMCD inputs are not matched.
Any DCM clock output can drive any PMCD input in the same top/bottom half of the
device. A DCM can drive parallel PMCDs in the same group of two. It is not advisable to
drive parallel PMCDs with DCMs in different groups of two (on the same top/bottom
half) because there can be significant skew between PMCD outputs. This skew is caused by
the skew between inputs of PMCDs in different groups.
Any BUFGCTRL can drive any Virtex-4 FPGA PMCD. However, only up to eight
dedicated global clock routing resources exist in a particular clock region. Therefore, access
to PMCD inputs via a BUFGCTRL is limited to eight unique signals. Other resources in the
clock region will compete for the eight global clock tracks.
CLKA1D(2, 4, 8)
CLKA1
CLKA
Deasserted RST
RST
REL
illustrates the interaction between the RST and REL signals.
is registered.
Delayed output clocks start toggling.
Figure 3-6: REL Waveform Example
www.xilinx.com
PMCD Usage and Design Guidelines
Release is synchronized.
Divided output clocks start toggling.
RST_DEASSERT_CLK = CLKA
EN_REL = TRUE
UG070_3_06_071404
105
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