XC5VLX220-2FFG1760C Xilinx Inc, XC5VLX220-2FFG1760C Datasheet - Page 104

• Manufacturer Part Number: XC5VLX220-2FFG1760C
• Description: IC FPGA VIRTEX-5 220K 1760FBGA
• Manufacturer: Xilinx Inc
• Series: Virtex™-5 LXr

Specifications of XC5VLX220-2FFG1760C

• Number Of Logic Elements/cells: 221184
• Number Of Labs/clbs: 17280
• Total Ram Bits: 7077888
• Number Of I /o: 800
• Voltage - Supply: 0.95 V ~ 1.05 V
• Mounting Type: Surface Mount
• Operating Temperature: 0°C ~ 85°C
• Package / Case: 1760-BBGA, FCBGA
• Package: 1760FCBGA
• Family Name: Virtex®-5
• Device Logic Units: 221184
• Typical Operating Supply Voltage: 1 V
• Maximum Number Of User I/os: 800
• Ram Bits: 7077888
• For Use With: HW-AFX-FF1760-500-G - BOARD DEV VIRTEX 5 FF1760
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Number Of Gates: -

Chapter 3: Phase-Locked Loops (PLLs)
Reference Clock Switching
104
X-Ref Target - Figure 3-8
All “O” counters are equivalent, anything O0 can do, O1 can do. The PLL outputs are
flexible when connecting to the global clock network since they are identical. In most cases,
this level of detail is imperceptible to the designer as the software and PLL Wizard
determines the proper settings through the PLL attributes and Wizard inputs.
The PLL reference clock can be dynamically switched by using the CLKINSEL pin. The
switching is done asynchronously. Since the clock signal can generate a narrow pulse
resulting in erroneous behavior of the PLL, the PLL should be held in RESET while
selecting the alternate clock with the CLKINSEL (CLKSRC) signal. The PLL clock mux
switching is shown in
mux. No synchronization logic is present.
X-Ref Target - Figure 3-9
8 Phases
Counter
Outputs
VCO
135°
180°
225°
270°
315°
45°
90°
O0
O1
O2
O3
0°
One Cycle Delay
Figure
CLKSRC
CLKIN1
CLKIN2
www.xilinx.com
IBUFG
IBUFG
Figure 3-8: Selecting VCO Phases
BUFG
BUFG
Figure 3-9: Input Clock Switching
DCM
DCM
3-9. The CLKINSEL (CLKSRC) signal directly controls the
ug190_3_09_050906
PLL
CLKIN
Virtex-5 FPGA User Guide
UG190 (v5.3) May 17, 2010
ug190_03_08_032506