XC5VLX50T-2FFG665I Xilinx Inc, XC5VLX50T-2FFG665I Datasheet - Page 32

• Manufacturer Part Number: XC5VLX50T-2FFG665I
• Description: IC FPGA VIRTEX-5 50K 665FCBGA
• Manufacturer: Xilinx Inc
• Series: Virtex™-5 LXTr

Specifications of XC5VLX50T-2FFG665I

• Number Of Logic Elements/cells: 46080
• Number Of Labs/clbs: 3600
• Total Ram Bits: 2211840
• Number Of I /o: 360
• Voltage - Supply: 0.95 V ~ 1.05 V
• Mounting Type: Surface Mount
• Operating Temperature: -40°C ~ 100°C
• Package / Case: 665-BBGA, FCBGA
• 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
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Number Of Gates: -

Chapter 1: Clock Resources
32
BUFGCE and BUFGCE_1
Unlike BUFG, BUFGCE is a clock buffer with one clock input, one clock output and a clock
enable line. This primitive is based on BUFGCTRL with some pins connected to logic High
or Low.
constraint is available for BUFGCE and BUFGCE_1.
X-Ref Target - Figure 1-5
The switching condition for BUFGCE is similar to BUFGCTRL. If the CE input is Low prior
to the incoming rising clock edge, the following clock pulse does not pass through the
clock buffer, and the output stays Low. Any level change of CE during the incoming clock
High pulse has no effect until the clock transitions Low. The output stays Low when the
clock is disabled. However, when the clock is being disabled it completes the clock High
pulse.
Since the clock enable line uses the CE pin of the BUFGCTRL, the select signal must meet
the setup time requirement. Violating this setup time may result in a glitch.
illustrates the timing diagram for BUFGCE.
X-Ref Target - Figure 1-6
BUFGCE_1 is similar to BUFGCE, with the exception of its switching condition. If the CE
input is Low prior to the incoming falling clock edge, the following clock pulse does not
pass through the clock buffer, and the output stays High. Any level change of CE during
the incoming clock Low pulse has no effect until the clock transitions High. The output
stays High when the clock is disabled. However, when the clock is being disabled it
completes the clock Low pulse.
BUFGCE(CE)
BUFGCE(O)
BUFGCE(I)
Figure 1-5
CE
I
illustrates the relationship of BUFGCE and BUFGCTRL. A LOC
Figure 1-6: BUFGCE Timing Diagram
Figure 1-5: BUFGCE as BUFGCTRL
BUFGCE
www.xilinx.com
T
BCCKO_O
O
T
BCCCK_CE
GND
GND
GND
V
V
V
CE
DD
DD
DD
BUFGCE as BUFGCTRL
I
IGNORE1
CE1
S1
I1
I0
S0
CE0
IGNORE0
ug190_1_05_032206
Virtex-5 FPGA User Guide
UG190 (v5.3) May 17, 2010
ug190_1_06_032206
O
Figure 1-6