XC5VLX85-2FFG676I Xilinx Inc, XC5VLX85-2FFG676I Datasheet - Page 44
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XC5VLX85-2FFG676I
Manufacturer Part Number
XC5VLX85-2FFG676I
Description
IC FPGA VIRTEX-5 85K 676FBGA
Manufacturer
Xilinx Inc
Series
Virtex™-5 LXr
Datasheets
1.XC5VLX30-1FFG324C.pdf
(91 pages)
2.XC5VLX30-1FFG324C.pdf
(13 pages)
3.XC5VLX30-1FFG324C.pdf
(385 pages)
Specifications of XC5VLX85-2FFG676I
Number Of Logic Elements/cells
82944
Number Of Labs/clbs
6480
Total Ram Bits
3538944
Number Of I /o
440
Voltage - Supply
0.95 V ~ 1.05 V
Mounting Type
Surface Mount
Operating Temperature
-40°C ~ 100°C
Package / Case
676-BBGA, FCBGA
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Number Of Gates
-
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Chapter 1: Clock Resources
44
BUFR Attributes and Modes
Clock division in the BUFR is controlled in software through the BUFR_DIVIDE attribute.
Table 1-8
Table 1-8: BUFR_DIVIDE Attribute
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.
X-Ref Target - Figure 1-21
In
•
•
•
•
•
Notes:
1. Location constraint is available for BUFR.
BUFR_DIVIDE
Attribute Name
Figure
Before clock event 1, CE is asserted High.
After CE is asserted and time T
three rate of the input I. T
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.
CLR
CE
O
I
lists the possible values when using the BUFR_DIVIDE attribute.
1-21:
Figure 1-21: BUFR Timing Diagrams with BUFR_DIVIDE Values
BRCKO_O
1
Defines whether the output clock is a divided
version of the input clock.
after clock event 4, O begins toggling again at the divided by three
T
www.xilinx.com
BRCKO_O
BRCKO_O
BRCKO_O
Description
and other timing numbers are best found in the
Figure
, the output O begins toggling at the divide by
BRDO_CLRO
T
BRDO_CLRO
1-21. In this example, the BUFR_DIVIDE
from time event 2, O stops
2
Virtex-5 FPGA User Guide
UG190 (v5.3) May 17, 2010
1, 2, 3, 4, 5, 6, 7, 8
BYPASS (default)
3
Possible Values
4
ug190_1_21_041808
T
BRCKO_O
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