XC4VFX40-11FFG1152C Xilinx Inc, XC4VFX40-11FFG1152C Datasheet - Page 28
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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:
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Chapter 1: Clock Resources
28
Global Clock Buffer Primitives
subsections detail the various configurations, primitives, and use models of the Virtex-4
FPGA clock buffers.
The primitives in
Table 1-3: Global Clock Buffer Primitives
BUFGCTRL
The BUFGCTRL primitive shown in
clocks. All other global clock buffer primitives are derived from certain configurations of
BUFGCTRL. The ISE® software tools manage the configuration of all these primitives.
BUFGCTRL has four select lines, S0, S1, CE0, and CE1. It also has two additional control
lines, IGNORE0 and IGNORE1. These six control lines are used to control the input I0 and
I1.
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
Notes:
1. All primitives are derived from a software preset of BUFGCTRL.
BUFGCTRL
BUFG
BUFGCE
BUFGCE_1
BUFGMUX
BUFGMUX_1
BUFGMUX_VIRTEX4
Primitive
Table 1-3
www.xilinx.com
Input
I0, I1
I0, I1
I0, I1
I0, I1
Figure 1-1: BUFGCTRL Primitive
are different configurations of the global clock buffers.
I
I
I
IGNORE1
CE1
S1
I1
I0
S0
CE0
IGNORE0
Output
Figure
O
O
O
O
O
O
O
BUFGCTRL
CE0, CE1, IGNORE0, IGNORE1, S0, S1
–
CE
CE
S
S
S
1-1, can switch between two asynchronous
UG070_1_01_031208
O
UG070 (v2.6) December 1, 2008
Control
Virtex-4 FPGA User Guide
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