XC5VLX50T-1FFG665C Xilinx Inc, XC5VLX50T-1FFG665C Datasheet - Page 29

FPGA, VIRTEX-5 LXT, 50K, 665FCBGA

XC5VLX50T-1FFG665C

Manufacturer Part Number
XC5VLX50T-1FFG665C
Description
FPGA, VIRTEX-5 LXT, 50K, 665FCBGA
Manufacturer
Xilinx Inc
Series
Virtex™-5 LXTr

Specifications of XC5VLX50T-1FFG665C

No. Of Logic Blocks
7200
Family Type
Virtex-5
No. Of Speed Grades
1
Total Ram Bits
2211840
No. Of I/o's
360
Clock Management
DCM, PLL
I/o Supply Voltage
3.3V
Operating Frequency Max
550MHz
Number Of Logic Elements/cells
46080
Number Of Labs/clbs
3600
Number Of I /o
360
Voltage - Supply
0.95 V ~ 1.05 V
Mounting Type
Surface Mount
Operating Temperature
0°C ~ 85°C
Package / Case
665-BBGA, FCBGA
Core Supply Voltage Range
1V
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With
HW-V5-ML561-UNI-G - EVALUATION PLATFORM VIRTEX-5HW-V5-ML550-UNI-G - EVALUATION PLATFORM VIRTEX-5HW-V5-ML521-UNI-G - EVALUATION PLATFORM VIRTEX-5HW-V5GBE-DK-UNI-G - KIT DEV V5 LXT GIGABIT ETHERNET122-1508 - EVALUATION PLATFORM VIRTEX-5
Number Of Gates
-
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Lead free / RoHS Compliant
Other names
122-1565

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XC5VLX50T-1FFG665CES
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Virtex-5 FPGA User Guide
UG190 (v5.3) May 17, 2010
BUFGCTRL is designed to switch between two clock inputs without the possibility of a
glitch. When the presently selected clock transitions from High to Low after S0 and S1
change, the output is kept Low until the other (to-be-selected) clock has transitioned from
High to Low. Then the new clock starts driving the output.The default configuration for
BUFGCTRL is falling edge sensitive and held at Low prior to the input switching.
BUFGCTRL can also be rising edge sensitive and held at High prior to the input switching.
In some applications the conditions previously described are not desirable. Asserting the
IGNORE pins will bypass the BUFGCTRL from detecting the conditions for switching
between two clock inputs. In other words, asserting IGNORE causes the mux to switch the
inputs at the instant the select pin changes. IGNORE0 causes the output to switch away
from the I0 input immediately when the select pin changes, while IGNORE1 causes the
output to switch away from the I1 input immediately when the select pin changes.
Selection of an input clock requires a “select” pair (S0 and CE0, or S1 and CE1) to be
asserted High. If either S or CE is not asserted High, the desired input will not be selected.
In normal operation, both S and CE pairs (all four select lines) are not expected to be
asserted High simultaneously. Typically only one pin of a “select” pair is used as a select
line, while the other pin is tied High. The truth table is shown in
Table 1-3: Truth Table for Clock Resources
Although both S and CE are used to select a desired output, each one of these pins behaves
slightly different. When using CE to switch clocks, the change in clock selection can be
faster than when using S. Violation in Setup/Hold time of the CE pins causes a glitch at the
clock output. On the other hand, using the S pins allows the user to switch between the two
clock inputs without regard to Setup/Hold times. It will not result in a glitch. See
BUFGMUX_CTRL. The CE pin is designed to allow backward compatibility from Virtex-II
and Virtex-II Pro FPGAs.
Notes:
1. Old input refers to the valid input clock before this state is achieved.
2. For all other states, the output becomes the value of INIT_OUT and does not toggle.
CE0
X
1
1
0
1
S0
www.xilinx.com
X
1
1
0
1
CE1
X
0
1
1
1
Global Clocking Resources
S1
X
0
1
1
1
Table
1-3.
Old Input
O
I0
I0
I1
I1
(1)
29

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