XC4VFX40-11FFG1152C Xilinx Inc, XC4VFX40-11FFG1152C Datasheet - Page 43
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XC4VFX40-11FFG1152C
Manufacturer Part Number
XC4VFX40-11FFG1152C
Description
IC FPGA VIRTEX-4 FX 40K 1152FBGA
Manufacturer
Xilinx Inc
Series
Virtex™-4r
Specifications of XC4VFX40-11FFG1152C
Number Of Logic Elements/cells
41904
Number Of Labs/clbs
4656
Total Ram Bits
2654208
Number Of I /o
448
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
Manufacturer
Quantity
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Part Number:
XC4VFX40-11FFG1152C
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Virtex-4 FPGA User Guide
UG070 (v2.6) December 1, 2008
CLR
CE
O
I
R
1
T
BUFR Use Models
BRDCK_CE
Figure 1-21: BUFR Timing Diagrams with BUFR_DIVIDE Values
The propagation delay through BUFR is different for BUFR_DIVIDE = 1 and
BUFR_DIVIDE = BYPASS. When set to 1, the delay is slightly more than BYPASS. All other
divisors have the same delay BUFR_DIVIDE = 1. The phase relationship between the input
clock and the output clock is the same for all possible divisions except BYPASS.
The timing relationship between the inputs and output of BUFR when using the
BUFR_DIVIDE attribute is illustrated in
attribute is set to three. Sometime before this diagram CLR was asserted.
In
•
•
•
•
•
BUFRs are ideal for source-synchronous applications requiring clock domain crossing or
serial-to-parallel conversion. Unlike BUFIOs, BUFRs are capable of clocking logic
resources in the FPGAs other than the IOBs.
Figure
At time T
Four clock cycles and T
the divide by three rate of the input I. T
found in the speed specification.
Note: The duty cycle is not 50/50 for odd division. The Low pulse is one cycle of I
longer.
At time event 2, CLR is asserted. After T
toggling.
At time event 3, CLR is deasserted.
At time T
rate of I.
1-21:
BRDCK_CE
BRCKO_O
after clock event 4, O begins toggling again at the divided by three
before clock event 1, CE is asserted High.
www.xilinx.com
BRCKO_O
T
BRCKO_O
after CE is asserted, the output O begins toggling at
Figure
BRCKO_O
BRDO_CLRO
Figure 1-22
1-21. In this example, the BUFR_DIVIDE
T
BRDO_CLRO
and other timing numbers are best
from time event 2, O stops
is a BUFR design example.
Regional Clocking Resources
2
3
UG070_1_21_030806
4
T
BRCKO_O
43
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